nodejs 判断 数组为空的 json数据时,一直报错undefined

对不起各位大神,请不要恨铁不成钢,我真心不懂这个简单的初级问题。
我自己在做一个API小程序,用nodejs的request包抓取了许多json数据。
问题简单的来说就是,我需要判断一个有时候有数值,有时候却为空的属性,属性名为deliverTime,
当deliverTime存在的时候,抓取这个json属性,当deliverTime不存在的时候,不抓取。
然而,如果我的判断语句为: if(body.data.deliverBills[0].deliverTime){console.log(body.data.deliverBills[0].deliverTime;}else{console.log(“不存在deliverTime”);}
如果deliverTime存在还好,会正常运行。
但一旦不存在的时候,似乎轮不到这个判断函数运行,就会因为deliverTime不存在直接先报错,报错内容为:
TypeError: Cannot read property ‘deliverTime’ of undefined
at Request._callback (c:\node\syncec9.js:126:34)
at Request.self.callback (c:\node\node_modules\request\request.js:199:22)
at emitTwo (events.js:87:13)
at Request.emit (events.js:172:7)
at Request. (c:\node\node_modules\request\request.js:1036:10)
at emitOne (events.js:82:20)
at Request.emit (events.js:169:7)
at IncomingMessage. (c:\node\node_modules\request\request.js:963:

at emitNone (events.js:72:20)
at IncomingMessage.emit (events.js:166:7)

求大神们开导调教

1个回答

if ('deliverTime' in body.data.deliverBills[0])
,,,
http://shifahaicool.blog.163.com/blog/static/35093326200910309248953/

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Initializing Spring embedded WebApplicationContext 2020-02-21 23:53:45.350 mallSearch [main] INFO org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 4905 ms 2020-02-21 23:53:47.034 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - no modules loaded 2020-02-21 23:53:47.036 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - loaded plugin [org.elasticsearch.index.reindex.ReindexPlugin] 2020-02-21 23:53:47.036 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - loaded plugin [org.elasticsearch.join.ParentJoinPlugin] 2020-02-21 23:53:47.039 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - loaded plugin [org.elasticsearch.percolator.PercolatorPlugin] 2020-02-21 23:53:47.039 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - loaded plugin [org.elasticsearch.script.mustache.MustachePlugin] 2020-02-21 23:53:47.039 mallSearch [main] INFO org.elasticsearch.plugins.PluginsService - loaded plugin [org.elasticsearch.transport.Netty4Plugin] 2020-02-21 23:53:49.084 mallSearch [main] INFO o.s.d.e.client.TransportClientFactoryBean - Adding transport node : 10.236.6.52:9200 2020-02-21 23:54:20.425 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:20.940 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:20.971 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.034 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.065 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.112 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.315 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.362 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:21.643 mallSearch [main] INFO org.redisson.Version - Redisson 3.12.0 2020-02-21 23:54:21.909 mallSearch [redisson-netty-4-24] INFO o.r.connection.pool.MasterPubSubConnectionPool - 1 connections initialized for 10.236.6.54/10.236.6.54:6379 2020-02-21 23:54:21.956 mallSearch [redisson-netty-4-28] INFO org.redisson.connection.pool.MasterConnectionPool - 20 connections initialized for 10.236.6.54/10.236.6.54:6379 2020-02-21 23:54:22.690 mallSearch [main] ERROR o.s.d.e.r.support.AbstractElasticsearchRepository - failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{yZBpr1VZQfm3KgYuKq0eRA}{10.236.6.52}{10.236.6.52:9200}] 2020-02-21 23:54:22.971 mallSearch [main] INFO s.d.s.w.PropertySourcedRequestMappingHandlerMapping - Mapped URL path [/v2/api-docs] onto method [public org.springframework.http.ResponseEntity<springfox.documentation.spring.web.json.Json> springfox.documentation.swagger2.web.Swagger2Controller.getDocumentation(java.lang.String,javax.servlet.http.HttpServletRequest)] 2020-02-21 23:54:23.408 mallSearch [main] INFO o.s.security.web.DefaultSecurityFilterChain - Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@2408ca4c, org.springframework.security.web.context.SecurityContextPersistenceFilter@29509774, org.springframework.security.web.header.HeaderWriterFilter@3741a170, org.springframework.security.web.authentication.logout.LogoutFilter@1988e095, org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter@4870d2e1, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@9198fe3, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@4dfe14d4, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@2f7e2481, org.springframework.security.web.session.SessionManagementFilter@26c24e5, org.springframework.security.web.access.ExceptionTranslationFilter@4a467f08, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@5de15ce1] _____ __________ __________________ _______ ________ ______________ __ / / /___ __ \___ ____/___ __ \__ __ \___ __ \___ __/__|__ \ _ / / / __ /_/ /__ __/ __ /_/ /_ / / /__ /_/ /__ / ____/ / / /_/ / _ _, _/ _ /___ _ ____/ / /_/ / _ _, _/ _ / _ __/ \____/ /_/ |_| /_____/ /_/ \____/ /_/ |_| /_/ /____/ ........................................................................................................ . uReport, is a Chinese style report engine licensed under the Apache License 2.0, . . which is opensource, easy to use,high-performance, with browser-based-designer. . ........................................................................................................ 2020-02-21 23:54:25.330 mallSearch [main] WARN com.netflix.config.sources.URLConfigurationSource - No URLs will be polled as dynamic configuration sources. 2020-02-21 23:54:25.330 mallSearch [main] INFO com.netflix.config.sources.URLConfigurationSource - To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2020-02-21 23:54:25.345 mallSearch [main] WARN com.netflix.config.sources.URLConfigurationSource - No URLs will be polled as dynamic configuration sources. 2020-02-21 23:54:25.345 mallSearch [main] INFO com.netflix.config.sources.URLConfigurationSource - To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2020-02-21 23:54:25.720 mallSearch [main] INFO o.s.scheduling.concurrent.ThreadPoolTaskExecutor - Initializing ExecutorService 'applicationTaskExecutor' 2020-02-21 23:54:27.095 mallSearch [main] WARN o.s.b.a.freemarker.FreeMarkerAutoConfiguration - Cannot find template location(s): [classpath:/templates/] (please add some templates, check your FreeMarker configuration, or set spring.freemarker.checkTemplateLocation=false) 2020-02-21 23:54:29.282 mallSearch [main] INFO o.s.cloud.netflix.eureka.InstanceInfoFactory - Setting initial instance status as: STARTING 2020-02-21 23:54:29.360 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Initializing Eureka in region us-east-1 2020-02-21 23:54:29.438 mallSearch [main] INFO c.n.discovery.provider.DiscoveryJerseyProvider - Using JSON encoding codec LegacyJacksonJson 2020-02-21 23:54:29.438 mallSearch [main] INFO c.n.discovery.provider.DiscoveryJerseyProvider - Using JSON decoding codec LegacyJacksonJson 2020-02-21 23:54:29.610 mallSearch [main] INFO c.n.discovery.provider.DiscoveryJerseyProvider - Using XML encoding codec XStreamXml 2020-02-21 23:54:29.610 mallSearch [main] INFO c.n.discovery.provider.DiscoveryJerseyProvider - Using XML decoding codec XStreamXml 2020-02-21 23:54:29.954 mallSearch [main] INFO c.n.d.shared.resolver.aws.ConfigClusterResolver - Resolving eureka endpoints via configuration 2020-02-21 23:54:30.266 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Disable delta property : false 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Single vip registry refresh property : null 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Force full registry fetch : false 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Application is null : false 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Registered Applications size is zero : true 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Application version is -1: true 2020-02-21 23:54:30.375 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Getting all instance registry info from the eureka server 2020-02-21 23:54:30.828 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - The response status is 200 2020-02-21 23:54:30.844 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Starting heartbeat executor: renew interval is: 30 2020-02-21 23:54:30.844 mallSearch [main] INFO com.netflix.discovery.InstanceInfoReplicator - InstanceInfoReplicator onDemand update allowed rate per min is 4 2020-02-21 23:54:30.844 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Discovery Client initialized at timestamp 1582300470844 with initial instances count: 8 2020-02-21 23:54:30.875 mallSearch [main] INFO o.s.c.n.e.serviceregistry.EurekaServiceRegistry - Registering application reportmanager with eureka with status UP 2020-02-21 23:54:30.875 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Saw local status change event StatusChangeEvent [timestamp=1582300470875, current=UP, previous=STARTING] 2020-02-21 23:54:30.907 mallSearch [main] INFO org.apache.kafka.clients.consumer.ConsumerConfig - ConsumerConfig values: auto.commit.interval.ms = 1000 auto.offset.reset = earliest bootstrap.servers = [10.236.6.52:9092] check.crcs = true client.id = connections.max.idle.ms = 540000 default.api.timeout.ms = 60000 enable.auto.commit = true exclude.internal.topics = true fetch.max.bytes = 52428800 fetch.max.wait.ms = 500 fetch.min.bytes = 1 group.id = myGroupId heartbeat.interval.ms = 3000 interceptor.classes = [] internal.leave.group.on.close = true isolation.level = read_uncommitted key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer max.partition.fetch.bytes = 1048576 max.poll.interval.ms = 300000 max.poll.records = 1000 metadata.max.age.ms = 300000 metric.reporters = [] metrics.num.samples = 2 metrics.recording.level = INFO metrics.sample.window.ms = 30000 partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor] receive.buffer.bytes = 65536 reconnect.backoff.max.ms = 1000 reconnect.backoff.ms = 50 request.timeout.ms = 30000 retry.backoff.ms = 100 sasl.client.callback.handler.class = null sasl.jaas.config = null sasl.kerberos.kinit.cmd = /usr/bin/kinit sasl.kerberos.min.time.before.relogin = 60000 sasl.kerberos.service.name = null sasl.kerberos.ticket.renew.jitter = 0.05 sasl.kerberos.ticket.renew.window.factor = 0.8 sasl.login.callback.handler.class = null sasl.login.class = null sasl.login.refresh.buffer.seconds = 300 sasl.login.refresh.min.period.seconds = 60 sasl.login.refresh.window.factor = 0.8 sasl.login.refresh.window.jitter = 0.05 sasl.mechanism = GSSAPI security.protocol = PLAINTEXT send.buffer.bytes = 131072 session.timeout.ms = 10000 ssl.cipher.suites = null ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1] ssl.endpoint.identification.algorithm = https ssl.key.password = null ssl.keymanager.algorithm = SunX509 ssl.keystore.location = null ssl.keystore.password = null ssl.keystore.type = JKS ssl.protocol = TLS ssl.provider = null ssl.secure.random.implementation = null ssl.trustmanager.algorithm = PKIX ssl.truststore.location = null ssl.truststore.password = null ssl.truststore.type = JKS value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer 2020-02-21 23:54:31.016 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka version : 2.0.1 2020-02-21 23:54:31.016 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka commitId : fa14705e51bd2ce5 2020-02-21 23:54:31.313 mallSearch [DiscoveryClient-InstanceInfoReplicator-0] INFO com.netflix.discovery.DiscoveryClient - DiscoveryClient_REPORTMANAGER/192.168.62.1:9011: registering service... 2020-02-21 23:54:31.547 mallSearch [DiscoveryClient-InstanceInfoReplicator-0] INFO com.netflix.discovery.DiscoveryClient - DiscoveryClient_REPORTMANAGER/192.168.62.1:9011 - registration status: 204 2020-02-21 23:54:31.656 mallSearch [main] INFO org.apache.kafka.clients.Metadata - Cluster ID: rgWO07ohQH6Rn35woczhUQ 2020-02-21 23:54:31.719 mallSearch [main] INFO org.apache.kafka.clients.consumer.ConsumerConfig - ConsumerConfig values: auto.commit.interval.ms = 1000 auto.offset.reset = earliest bootstrap.servers = [10.236.6.52:9092] check.crcs = true client.id = connections.max.idle.ms = 540000 default.api.timeout.ms = 60000 enable.auto.commit = true exclude.internal.topics = true fetch.max.bytes = 52428800 fetch.max.wait.ms = 500 fetch.min.bytes = 1 group.id = myGroupId heartbeat.interval.ms = 3000 interceptor.classes = [] internal.leave.group.on.close = true isolation.level = read_uncommitted key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer max.partition.fetch.bytes = 1048576 max.poll.interval.ms = 300000 max.poll.records = 1000 metadata.max.age.ms = 300000 metric.reporters = [] metrics.num.samples = 2 metrics.recording.level = INFO metrics.sample.window.ms = 30000 partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor] receive.buffer.bytes = 65536 reconnect.backoff.max.ms = 1000 reconnect.backoff.ms = 50 request.timeout.ms = 30000 retry.backoff.ms = 100 sasl.client.callback.handler.class = null sasl.jaas.config = null sasl.kerberos.kinit.cmd = /usr/bin/kinit sasl.kerberos.min.time.before.relogin = 60000 sasl.kerberos.service.name = null sasl.kerberos.ticket.renew.jitter = 0.05 sasl.kerberos.ticket.renew.window.factor = 0.8 sasl.login.callback.handler.class = null sasl.login.class = null sasl.login.refresh.buffer.seconds = 300 sasl.login.refresh.min.period.seconds = 60 sasl.login.refresh.window.factor = 0.8 sasl.login.refresh.window.jitter = 0.05 sasl.mechanism = GSSAPI security.protocol = PLAINTEXT send.buffer.bytes = 131072 session.timeout.ms = 10000 ssl.cipher.suites = null ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1] ssl.endpoint.identification.algorithm = https ssl.key.password = null ssl.keymanager.algorithm = SunX509 ssl.keystore.location = null ssl.keystore.password = null ssl.keystore.type = JKS ssl.protocol = TLS ssl.provider = null ssl.secure.random.implementation = null ssl.trustmanager.algorithm = PKIX ssl.truststore.location = null ssl.truststore.password = null ssl.truststore.type = JKS value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer 2020-02-21 23:54:31.719 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka version : 2.0.1 2020-02-21 23:54:31.719 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka commitId : fa14705e51bd2ce5 2020-02-21 23:54:31.719 mallSearch [main] INFO o.s.scheduling.concurrent.ThreadPoolTaskScheduler - Initializing ExecutorService 2020-02-21 23:54:31.734 mallSearch [main] INFO org.apache.kafka.clients.consumer.ConsumerConfig - ConsumerConfig values: auto.commit.interval.ms = 5000 auto.offset.reset = earliest bootstrap.servers = [127.0.0.1:9092] check.crcs = true client.id = connections.max.idle.ms = 540000 default.api.timeout.ms = 60000 enable.auto.commit = true exclude.internal.topics = true fetch.max.bytes = 52428800 fetch.max.wait.ms = 500 fetch.min.bytes = 1 group.id = etl heartbeat.interval.ms = 3000 interceptor.classes = [] internal.leave.group.on.close = true isolation.level = read_uncommitted key.deserializer = class org.apache.kafka.common.serialization.StringDeserializer max.partition.fetch.bytes = 1048576 max.poll.interval.ms = 300000 max.poll.records = 1000 metadata.max.age.ms = 300000 metric.reporters = [] metrics.num.samples = 2 metrics.recording.level = INFO metrics.sample.window.ms = 30000 partition.assignment.strategy = [class org.apache.kafka.clients.consumer.RangeAssignor] receive.buffer.bytes = 65536 reconnect.backoff.max.ms = 1000 reconnect.backoff.ms = 50 request.timeout.ms = 180000 retry.backoff.ms = 100 sasl.client.callback.handler.class = null sasl.jaas.config = null sasl.kerberos.kinit.cmd = /usr/bin/kinit sasl.kerberos.min.time.before.relogin = 60000 sasl.kerberos.service.name = null sasl.kerberos.ticket.renew.jitter = 0.05 sasl.kerberos.ticket.renew.window.factor = 0.8 sasl.login.callback.handler.class = null sasl.login.class = null sasl.login.refresh.buffer.seconds = 300 sasl.login.refresh.min.period.seconds = 60 sasl.login.refresh.window.factor = 0.8 sasl.login.refresh.window.jitter = 0.05 sasl.mechanism = GSSAPI security.protocol = PLAINTEXT send.buffer.bytes = 131072 session.timeout.ms = 120000 ssl.cipher.suites = null ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1] ssl.endpoint.identification.algorithm = https ssl.key.password = null ssl.keymanager.algorithm = SunX509 ssl.keystore.location = null ssl.keystore.password = null ssl.keystore.type = JKS ssl.protocol = TLS ssl.provider = null ssl.secure.random.implementation = null ssl.trustmanager.algorithm = PKIX ssl.truststore.location = null ssl.truststore.password = null ssl.truststore.type = JKS value.deserializer = class org.apache.kafka.common.serialization.StringDeserializer 2020-02-21 23:54:31.734 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka version : 2.0.1 2020-02-21 23:54:31.750 mallSearch [main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka commitId : fa14705e51bd2ce5 2020-02-21 23:54:32.016 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO org.apache.kafka.clients.Metadata - Cluster ID: rgWO07ohQH6Rn35woczhUQ 2020-02-21 23:54:32.047 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.a.k.c.consumer.internals.AbstractCoordinator - [Consumer clientId=consumer-2, groupId=myGroupId] Discovered group coordinator 10.236.6.52:9092 (id: 2147483646 rack: null) 2020-02-21 23:54:32.063 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.a.k.c.consumer.internals.ConsumerCoordinator - [Consumer clientId=consumer-2, groupId=myGroupId] Revoking previously assigned partitions [] 2020-02-21 23:54:32.063 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.s.kafka.listener.KafkaMessageListenerContainer - partitions revoked: [] 2020-02-21 23:54:32.063 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.a.k.c.consumer.internals.AbstractCoordinator - [Consumer clientId=consumer-2, groupId=myGroupId] (Re-)joining group 2020-02-21 23:54:32.391 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.a.k.c.consumer.internals.AbstractCoordinator - [Consumer clientId=consumer-2, groupId=myGroupId] Successfully joined group with generation 21 2020-02-21 23:54:32.406 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.a.k.c.consumer.internals.ConsumerCoordinator - [Consumer clientId=consumer-2, groupId=myGroupId] Setting newly assigned partitions [es-mall-brand-update-0] 2020-02-21 23:54:32.625 mallSearch [org.springframework.kafka.KafkaListenerEndpointContainer#6-0-C-1] INFO o.s.kafka.listener.KafkaMessageListenerContainer - partitions assigned: [es-mall-brand-update-0] 2020-02-21 23:54:32.828 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:33.969 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:35.219 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:36.468 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:37.937 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:39.764 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:41.904 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:44.185 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:46.372 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:48.309 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:50.231 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:52.152 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:54.370 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:56.495 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:54:58.416 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:00.588 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:02.602 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:04.540 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:06.570 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:08.617 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:10.507 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:12.459 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:14.506 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:16.631 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:18.802 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:20.708 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:22.848 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:24.988 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:27.113 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:29.346 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:31.611 mallSearch [main] WARN org.apache.kafka.clients.NetworkClient - [Consumer clientId=consumer-3, groupId=etl] Connection to node -1 could not be established. Broker may not be available. 2020-02-21 23:55:31.750 mallSearch [main] WARN o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Failed to start bean 'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested exception is org.apache.kafka.common.errors.TimeoutException: Timeout expired while fetching topic metadata 2020-02-21 23:55:31.782 mallSearch [main] INFO o.s.scheduling.concurrent.ThreadPoolTaskExecutor - Shutting down ExecutorService 'applicationTaskExecutor' 2020-02-21 23:55:32.516 mallSearch [main] INFO o.s.jmx.export.annotation.AnnotationMBeanExporter - Could not unregister MBean [com.github.tobato.fastdfs.conn:name=fdfsConnectionPool,type=FdfsConnectionPool] as said MBean is not registered (perhaps already unregistered by an external process) 2020-02-21 23:56:00.384 mallSearch [main] INFO com.netflix.discovery.DiscoveryClient - Shutting down DiscoveryClient ... 2020-02-21 23:56:00.431 mallSearch [main] WARN o.s.c.annotation.CommonAnnotationBeanPostProcessor - Destroy method on bean with name 'scopedTarget.eurekaClient' threw an exception: org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'eurekaInstanceConfigBean': Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!) 2020-02-21 23:56:00.431 mallSearch [main] INFO org.apache.catalina.core.StandardService - Stopping service [Tomcat] 2020-02-21 23:56:00.462 mallSearch [main] INFO o.s.b.a.l.ConditionEvaluationReportLoggingListener - Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-02-21 23:56:00.478 mallSearch [main] ERROR org.springframework.boot.SpringApplication - Application run failed org.springframework.context.ApplicationContextException: Failed to start bean 'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested exception is org.apache.kafka.common.errors.TimeoutException: Timeout expired while fetching topic metadata at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:185) at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53) at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360) at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158) at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:893) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:163) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) at cn.chinaunicom.mall.mallsearch.ReportManagerApplication.main(ReportManagerApplication.java:85) Caused by: org.apache.kafka.common.errors.TimeoutException: Timeout expired while fetching topic metadata 2020-02-21 23:56:01.634 mallSearch [DiscoveryClient-InstanceInfoReplicator-0] WARN com.netflix.discovery.InstanceInfoReplicator - There was a problem with the instance info replicator org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaInstanceConfigBean' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.class]: Unsatisfied dependency expressed through method 'eurekaInstanceConfigBean' parameter 0; nested exception is org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'inetUtilsProperties': Could not bind properties to 'InetUtilsProperties' : prefix=spring.cloud.inetutils, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is java.lang.IllegalStateException: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@31c2affc has not been refreshed yet at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:769) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:509) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857) at org.springframework.beans.factory.support.ConstructorResolver.resolvePreparedArguments(ConstructorResolver.java:804) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:430) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$1(AbstractBeanFactory.java:356) at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:390) at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:184) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:353) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:672) at com.netflix.appinfo.ApplicationInfoManager$$EnhancerBySpringCGLIB$$918f0f04.refreshDataCenterInfoIfRequired(<generated>) at com.netflix.discovery.DiscoveryClient.refreshInstanceInfo(DiscoveryClient.java:1377) at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:117) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) at java.util.concurrent.FutureTask.run(FutureTask.java) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'inetUtilsProperties': Could not bind properties to 'InetUtilsProperties' : prefix=spring.cloud.inetutils, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is java.lang.IllegalStateException: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@31c2affc has not been refreshed yet at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.bind(ConfigurationPropertiesBindingPostProcessor.java:110) at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:93) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:414) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1754) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857) at org.springframework.beans.factory.support.ConstructorResolver.resolvePreparedArguments(ConstructorResolver.java:804) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:430) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760) ... 37 common frames omitted Caused by: java.lang.IllegalStateException: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@31c2affc has not been refreshed yet at org.springframework.context.support.AbstractApplicationContext.assertBeanFactoryActive(AbstractApplicationContext.java:1092) at org.springframework.context.support.AbstractApplicationContext.getBeanProvider(AbstractApplicationContext.java:1134) at org.springframework.boot.context.properties.ConfigurationPropertiesBinder.getBindHandlerAdvisors(ConfigurationPropertiesBinder.java:138) at org.springframework.boot.context.properties.ConfigurationPropertiesBinder.getBindHandler(ConfigurationPropertiesBinder.java:130) at org.springframework.boot.context.properties.ConfigurationPropertiesBinder.bind(ConfigurationPropertiesBinder.java:82) at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.bind(ConfigurationPropertiesBindingPostProcessor.java:107) ... 65 common frames omitted Disconnected from the target VM, address: '127.0.0.1:62410', transport: 'socket' ```
nodejs:无法引入express库
js代码如下 ``` var express=require('express') var server=express() // page:/user/... var routeUser=express.Router() routeUser.get('/1.html',function(req,res){ res.send('user1') }) routeUser.get('.2.html',function(req,res){ res.send('user22222') }) server.use('/user',routeUser) server.listen(8080) ``` 调试时报错: Cannot find module 'express' 然后我install了express ``` >npm install -g express + express@4.17.1 updated 1 package in 1.607s ``` 查看版本 ``` express --version 'express' 不是内部或外部命令,也不是可运行的程序 或批处理文件。 ``` 去百度搜索后,有说删文件的,也有说升级npm的,我都做过了 当前npm版本是6.13.7,应该是最新的了
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nodejs怎样把: uid_score_bid = ['A,1,a','A,1,b','A,1,d','B,1,b','B,1,c','B,1,e','C,1,c','C,1,d','D,1,b','D,1,c','D,1,d','E,1,a','E,1,d'] 这种类型的数据转化成: {'A': {'a': 1, 'b': 1, 'd': 1}, 'B': {'b': 1, 'c': 1, 'e': 1}, 'C': {'c': 1, 'd': 1}, 'D': {'b': 1, 'c': 1, 'd': 1}, 'E': {'a': 1, 'd': 1}} 这种类型的? ``` function divData(arr){ console.log(arr); let dic={}; let dd={}; let user; let score; let cid; arr.forEach(element => { user=element.split('@')[0]; score=element.split('@')[1]; cid=element.split('@')[2]; dic[user]=dd; dd[cid]=score; }); console.log(dic) } 这是我的代码,但运行出来的结果不对 ```
nodejs readFileSync 报错
在教程中学习nodejs时,输入如下代码: ![图片说明](https://img-ask.csdn.net/upload/201705/18/1495090981_982052.jpg) 出现问题如下: ![图片说明](https://img-ask.csdn.net/upload/201705/18/1495091086_432277.jpg) 初学nodejs,不知道哪里出的问题,求指教
有什么工具可以找出一个nodejs项目中的所有全局变量么
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![Nodejs](https://img-ask.csdn.net/upload/201611/08/1478571977_647371.png) Nodejs报错module.js:327怎么解决?
Nodejs,Promise使用时在then中返回Promise报错,不明白这样写为什么报错
var wechat = new Wechat() var data = yield wechat('image', __dirname + '\\.5.jpg', false) Wechat.prototype.uploadMaterial = function(type, filePath, isPermanent){ var that = this var url = api.temporary.upload var form = { media: fs.createReadStream(filePath) } that .fetchAccessToken() .then(function(data){ console.log(data) if(!isPermanent){ url += 'access_token=' + data.access_token + '&type=' + type } return new Promise(function(resolve, reject){ request({method:'POST', uri: url, formData: form, json:true}) .then(function(response){ var _data = response.body resolve(_data) }) }) }) } ``` ``` ## 报错信息如下 TypeError: You may only yield a function, promise, generator, array, or object, but the following object was passed: " undefined" at next (H:\study\com\node_modules\co\index.js:101:25) at onFulfilled (H:\study\com\node_modules\co\index.js:69:7) at H:\study\com\node_modules\co\index.js:54:5 at Object.co (H:\study\com\node_modules\co\index.js:50:10) at Object.toPromise (H:\study\com\node_modules\co\index.js:118:63) at next (H:\study\com\node_modules\co\index.js:99:29) at onFulfilled (H:\study\com\node_modules\co\index.js:69:7) at tryCatcher (H:\study\com\node_modules\bluebird\js\release\util.js:16:23) at Promise._settlePromiseFromHandler (H:\study\com\node_modules\bluebird\js\release\promise.js:512:31) at Promise._settlePromise (H:\study\com\node_modules\bluebird\js\release\promise.js:569:18) at Promise._settlePromiseCtx (H:\study\com\node_modules\bluebird\js\release\promise.js:606:10) at Async._drainQueue (H:\study\com\node_modules\bluebird\js\release\async.js:138:12) at Async._drainQueues (H:\study\com\node_modules\bluebird\js\release\async.js:143:10) at Immediate.Async.drainQueues (H:\study\com\node_modules\bluebird\js\release\async.js:17:14) at tryOnImmediate (timers.js:639:5) at processImmediate [as _immediateCallback] (timers.js:611:5) ## Nodejs,Promise使用时在then中返回Promise报错,不明白这样写为什么报错,求大神指点谢谢!
nodejs json 2个操作 请指教
刚接触nodejs不久,关于nodejs的json操作请大家指教一下: 《一》, 按照键值(key)进行字典排序, 比如{"bbb":"222","aaa","777","CCC":"123","aab":"898"} 按照字母从a到z的key来排序 《二》, 将排序过后的参数,进行key和value字符串拼接 拼接的结果 {"aa":"123","bb":"99","cc":"890"} 温馨提示:nodejs的问题
nodejs抓取图片时的问题
最近刚刚学nodejs,在学习中遇到一个难题,当我执行命令运行时报path must be a string.Received undefined 网上找了很多方法都没解决,具体情况如下。 ![图片说明](https://img-ask.csdn.net/upload/201909/06/1567772650_528688.png) 以下是程序代码 index.js ``` const request = require('request'); const path = require('path'); const fs = require('fs'); const config = require('./config'); const analyze = require('./analyze'); function start(){ request(config.url,function(err,res,body){ console.log('start'); if (!err && res) { console.log('start'); analyze.findImg(body,downLoad); } }) } function downLoad(imgUrl,i){ let ext = imgUrl.split('.').pop(); request(imgUrl).piep(fs.createWriteStream(path.join(config.imgDir,i + '.' + ext),{ 'encoding':'utf8' })) console.log(i); } start(); ``` config.js ``` const url = "https://www.neusoft.com/cn/"; const path = require('path'); const imDir = path.join(__dirname,'img'); module.exports.url = url; module.exports.imDir = imDir; ``` analyze.js ``` const cheerio = require('cheerio'); function findImg(dom,callback){ let $ = cheerio.load(dom); $('img').each(function(i,elem){ let imgSrc = $(this).attr('src'); callback(imgSrc,i); }); } module.exports.findImg = findImg; ``` node与npm版本号 ![图片说明](https://img-ask.csdn.net/upload/201909/06/1567773119_186274.png) 用户环境变量配置 ![图片说明](https://img-ask.csdn.net/upload/201909/06/1567773353_594895.png) 系统环境变量配置 ![图片说明](https://img-ask.csdn.net/upload/201909/06/1567773412_481197.png) 项目目录 ![图片说明](https://img-ask.csdn.net/upload/201909/06/1567773508_781627.png) 求大佬帮忙看下,实在没招了,可以的话能把原理说明下更好。
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小白学 Python 爬虫(25):爬取股票信息
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这三名男子靠开加密矿池获得7.22 亿美元,却不兑现收益拿去奢侈挥霍……
来源 /cointelegraph编译/火火酱责编 / Carol出品 / 区块链大本营(blockchain_camp)根据美国司法部12月10日发布的声明,美国新泽西州当局宣布...
卸载 x 雷某度!GitHub 标星 1.5w+,从此我只用这款全能高速下载工具!
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一名大专同学的四个问题
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复习一周,京东+百度一面,不小心都拿了Offer
京东和百度一面都问了啥,面试官百般刁难,可惜我全会。
Java 14 都快来了,为什么还有这么多人固守Java 8?
从Java 9开始,Java版本的发布就让人眼花缭乱了。每隔6个月,都会冒出一个新版本出来,Java 10 , Java 11, Java 12, Java 13, 到2020年3月份,...
达摩院十大科技趋势发布:2020 非同小可!
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面试官刁难:Java字符串可以引用传递吗?
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轻松搭建基于 SpringBoot + Vue 的 Web 商城应用
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讲真,这两个IDE插件,可以让你写出质量杠杠的代码
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Python+OpenCV实时图像处理
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2020年一线城市程序员工资大调查
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为什么猝死的都是程序员,基本上不见产品经理猝死呢?
相信大家时不时听到程序员猝死的消息,但是基本上听不到产品经理猝死的消息,这是为什么呢? 我们先百度搜一下:程序员猝死,出现将近700多万条搜索结果: 搜索一下:产品经理猝死,只有400万条的搜索结果,从搜索结果数量上来看,程序员猝死的搜索结果就比产品经理猝死的搜索结果高了一倍,而且从下图可以看到,首页里面的五条搜索结果,其实只有两条才是符合条件。 所以程序员猝死的概率真的比产品经理大,并不是错...
害怕面试被问HashMap?这一篇就搞定了!
声明:本文以jdk1.8为主! 搞定HashMap 作为一个Java从业者,面试的时候肯定会被问到过HashMap,因为对于HashMap来说,可以说是Java集合中的精髓了,如果你觉得自己对它掌握的还不够好,我想今天这篇文章会非常适合你,至少,看了今天这篇文章,以后不怕面试被问HashMap了 其实在我学习HashMap的过程中,我个人觉得HashMap还是挺复杂的,如果真的想把它搞得明明白...
毕业5年,我问遍了身边的大佬,总结了他们的学习方法
我问了身边10个大佬,总结了他们的学习方法,原来成功都是有迹可循的。
python爬取百部电影数据,我分析出了一个残酷的真相
2019年就这么匆匆过去了,就在前几天国家电影局发布了2019年中国电影市场数据,数据显示去年总票房为642.66亿元,同比增长5.4%;国产电影总票房411.75亿元,同比增长8.65%,市场占比 64.07%;城市院线观影人次17.27亿,同比增长0.64%。 看上去似乎是一片大好对不对?不过作为一名严谨求实的数据分析师,我从官方数据中看出了一点端倪:国产票房增幅都已经高达8.65%了,为什...
推荐10个堪称神器的学习网站
每天都会收到很多读者的私信,问我:“二哥,有什么推荐的学习网站吗?最近很浮躁,手头的一些网站都看烦了,想看看二哥这里有什么新鲜货。” 今天一早做了个恶梦,梦到被老板辞退了。虽然说在我们公司,只有我辞退老板的份,没有老板辞退我这一说,但是还是被吓得 4 点多都起来了。(主要是因为我掌握着公司所有的核心源码,哈哈哈) 既然 4 点多起来,就得好好利用起来。于是我就挑选了 10 个堪称神器的学习网站,推...
这些软件太强了,Windows必装!尤其程序员!
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(总结)阿里面试问了ArrayList,都问了啥?
我是真的没想到,面试官会这样问我ArrayList。
曾经优秀的人,怎么就突然不优秀了。
职场上有很多辛酸事,很多合伙人出局的故事,很多技术骨干被裁员的故事。说来模板都类似,曾经是名校毕业,曾经是优秀员工,曾经被领导表扬,曾经业绩突出,然而突然有一天,因为种种原因,被裁员了,...
大学四年因为知道了这32个网站,我成了别人眼中的大神!
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良心推荐,我珍藏的一些Chrome插件
上次搬家的时候,发了一个朋友圈,附带的照片中不小心暴露了自己的 Chrome 浏览器插件之多,于是就有小伙伴评论说分享一下我觉得还不错的浏览器插件。 我下面就把我日常工作和学习中经常用到的一些 Chrome 浏览器插件分享给大家,随便一个都能提高你的“生活品质”和工作效率。 Markdown Here Markdown Here 可以让你更愉快的写邮件,由于支持 Markdown 直接转电子邮...
看完这篇HTTP,跟面试官扯皮就没问题了
我是一名程序员,我的主要编程语言是 Java,我更是一名 Web 开发人员,所以我必须要了解 HTTP,所以本篇文章就来带你从 HTTP 入门到进阶,看完让你有一种恍然大悟、醍醐灌顶的感觉。 最初在有网络之前,我们的电脑都是单机的,单机系统是孤立的,我还记得 05 年前那会儿家里有个电脑,想打电脑游戏还得两个人在一个电脑上玩儿,及其不方便。我就想为什么家里人不让上网,我的同学 xxx 家里有网,每...
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