- Nodejs 使用http.get获取网页是为什么网页数据切割成很多部分
-
http.get(url, function(res) {
var data = "";
res.on('data', function (chunk) {
data += chunk;//nodejs为什么采用这种方式返回网页中的文本
});
res.on("end", function() {
callback(data);
console.log("end");
});
}).on("error", function() {
callback(null);
});
node.js和vue结合使用的问题_course
2020-05-09描述：我使用了vue来渲染数据，然后用node来做后端路由,就出现了vue数据不会渲染的问题。页面上啥都没有。 之前这么做的都没有问题，但是这次就出现了问题，原本的网页代码有点多， 不方便查看，于是我新建了一个项目，也是一样的问题，下面贴上代码： app.js 入口文件 ``` var express=require('express') var app=express() app.use('/node_modules/',express.static('./node_modules/')) app.use('/js/',express.static('./js/')) app.engine('html', require('express-art-template')); app.set('view engine', 'html'); // var render=require('./render.js')(app) app.get('/home',function(req,res){ // res.send("hello world") res.render("test.html",) }) app.listen("5464",function(){ console.log("server is running:http://localhost:5464") }) ``` test.html ``` <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <div id="app"> <ul> <li v-for="item in citys"> {{ item.name}} </li> </ul> <div> {{ hello}} </div> </div> <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.2.6/vue.js"></script> <script>Vue.config.productionTip=false</script> <script src="https://unpkg.com/element-ui/lib/index.js"></script> <script src="https://unpkg.com/axios/dist/axios.min.js"></script> <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script> <script type="text/javascript"> var app = new Vue({ el: "#app", data: { citys: [ {name:'name1',age:18}, {name:'name2',age:14}, {name:'name3',age:19} ], hello: "hello" } }) </script> </body> </html> ```
node.js服务器+D3数据可视化的问题_course
2015-02-11是这样的，我最近开始自学D3，今天创建了一个最简单的网页： ``` <!doctype html> <html> <head> <meta charset="utf-8"> <title>D3</title> <script src="node_modules/d3/d3.js"></script> </head> <body> <script> d3.select("body").append("p").text("New paragraph!"); </script> </body> </html> ``` 保存为index.html，双击打开，显示有New paragraph! 但是用node.js搭的http服务器来发布这个页面，再访问，得到的却是空白的 （就是file:///开头的本地文件可以正常显示D3内容，而访问node服务器127.0.0.1显示出来的页面就是空白的） 另一个例子（留意地址栏）：   不知道是什么造成了这个问题，求解答 node.js服务器代码（main.js） ``` var app = require('express')(); var server = require('http').Server(app); app.get('/', function(req, res){ res.sendFile(__dirname + '/index.html'); }); server.listen(80); ```
使用连接到MySQL数据库的Node.js路由通过表单进行身份验证_course
2018-07-25<div class="post-text" itemprop="text"> <p>I developed a Node.js API that executes its requests on a MySQL database. I also created a PHP webapp that uses this Node.js API.</p> <p>I would need now to implement an authetication feature on my web application. The informations of my users are stored in the MySQL database.</p> <p>So for the web part I made a form that sends a POST request, with all the user's informations, linking to a route in the API.</p> <p>Then for the Node.js part, I have read that passport module makes authentication simple, but I am having issues setting it up with what I get from the POST request.</p> <p>Can someone explain me how I should do that ?</p> <p>I do not know which code I have to show you for a better understanding of my issue, so just ask if you want any further explanation or code snippets from what I have already.</p> </div>
关于Node.js等待异步返回结果的问题。_course
2015-10-23懂Node.js的大神帮忙解决各位问题吧！！问题：mysql查询数据的函数，返回查询结果，但由于query异步，因此该函数在未查询到结果前已经返回，代码如下： function func_GetTableCount(tableName) { var json = ''; if (connection != null) { var sql = "SELECT * FROM " + tableName; connection.query(sql, function (err, rows) { if (err) { console.log('Message:GetTableCount,False,SQL=' + sql); console.log(err); } else { connection.end(); json = JSON.stringify(rows); console.log(json); } }); } return json; } 该函数始终返回空字符串！跪求大神帮忙。。。
jsp前端请求怎样发送到node.js后端_course
2015-11-17前端用jsp，后端用node.js，有没有大神知道前端请求怎样发送到后端，后端又是怎样转发到前端的
node.js代码中，怎么才能把循环从mysql数据库里查询的值赋值给数组？_course
2019-07-04各位大神，我现在node服务器端需要一个功能：从mysql数据库中循环查询出4个值，并且赋值给数组，现在代码如下： var mysql = require('mysql'); var connection = mysql.createConnection({ host : 'localhost', user : 'root', password : 'root', port: '3306', database: 'db_user' }); connection.connect();//连接数据库 var data= new Array(); var x; for(var i=0;i<4;i++){ //四次循环 function sum (m,n){ x = Math.floor(m + Math.random()*(n - m)); } sum(1,15327); //算出一个1-15327之间的随机数 var sql = 'SELECT words,meaning FROM wordlist where number=' +x; //查询X变量中随机数对应的单词 connection.query(sql,function (err, results) { if(err){ console.log('[SELECT ERROR] - ',err.message); return; } console.log('--------------------------SELECT----------------------------'); data[i] = results; // 将4次循环查询出的单词放入数组 console.log(data); console.log('------------------------------------------------------------\n\n'); }); } 但是因为node.js异步的关系，运行结果数组为空，结果如下： PS C:\Users\Mac\AppData\Roaming\npm> node data --------------------------SELECT---------------------------- [ <4 empty items>, [ RowDataPacket { words: 'decibel', meaning: 'n. 分贝' } ] ] ------------------------------------------------------------ --------------------------SELECT---------------------------- [ <4 empty items>, [ RowDataPacket { words: 'medic', meaning: 'n. 医学工作者，医科学生' } ] ] ------------------------------------------------------------ --------------------------SELECT---------------------------- [ <4 empty items>, [ RowDataPacket { words: 'marquee', meaning: 'n. 大天幕，华盖' } ] ] ------------------------------------------------------------ --------------------------SELECT---------------------------- [ <4 empty items>, [ RowDataPacket { words: 'accountant', meaning: 'n. 会计' } ] ] ------------------------------------------------------------ 请教大神，怎么才能把四次查询结果收集到数组里呢？
Node.js的TCP服务器和TCP客户端不能通讯的问题_course
2019-04-15这几天在做计算机网络课程设计需要为ATM机做个基于TCP的应用层协议报文。 然后我考虑用Node.js构建TCP服务器，但是在书上或网上看的构建TCP服务器 的代码基本上全部都是测试的本地连接，例如写的客户端测试代码如下 ``` var net = require('net'); var client = new net.Socket(); client.connect(3000,'127.0.0.1',function(){ console.log('connect success!!!') }); client.on('error',function(error){ console.log(error); }) ``` 确实这样没问题，可以与本机进行连接，但是如果我将ip改成同学的计算机的ip，然后他的服务端代码如下 ``` // 引入网络模块 var net = require('net'); var host = '0.0.0.0' // 创建TCP服务器 var ATMServer = net.createServer(function(socket){ console.log('someone connects'); console.log('本机ip：'+socket.localAddress); console.log('远程ip：'+socket.remoteAddress); }); // 监听客户端连接 ATMServer.listen(3000); ATMServer.on('listening',function(){ console.log('server is listening'); }); // 监听地址 var addr = ATMServer.address(); console.log(addr); ``` 此时再进行连接会没反应，过了一会儿会打印错误信息，难道Node.js的TCP服务器仅限于本地连接吗，那这样又有什么意义呢？ 求大佬赐教
node.js 表单提交，显示(需要改成2个node.js)_course
2018-05-25大佬们好，我现在做了个表单页面，创建数据库并储存用户资料，然后读取并显示。功能都实现了，就一个js。 现在的问题是，如果要改成2个node.js program要怎么弄？ 具体的要求是， 第一个node.js 创建sqlite3 数据库，里面有个TABLE用来存表单发送的数据。 第二个node.js启动服务器，接受到表单发送的数据并存到数据库，然后显示出来。 怎么修改才能以2个NODE.JS实现同样的效果， ---------------------------------------------------------------------- 下面则是我现在以一个index.js实现的code。 -------------------------------------------------------------------- ``` var express = require('express') var bodyParser = require("body-parser"); var app = express(); var sqlite3 = require('sqlite3').verbose(); // persistant file database "myDB". var db = new sqlite3.Database('myDB'); //set up table db.serialize(function (){ db.run('CREATE TABLE IF NOT EXISTS users (name text, password text, option text);') }); //now any files in public are routed app.use(express.static('public')); //Here we are configuring express to use body-parser as middle-ware. app.use(bodyParser.urlencoded({ extended: false })); // REST endpoint for posting a new user app.post('/users', function (req, res, next) { let username = req.body.name; let password = req.body.password; let optradio = req.body.optradio; var stmt = db.run( `INSERT OR IGNORE INTO users VALUES ("${username}", "${password}", "${optradio}")` ); res.status(200).redirect('/'); console.log("Just received POST data for users endpoint!"); console.log(`Data includes: ${username}, ${password} and ${optradio}`); }); // REST endpoint for getting all user data app.get('/users', function (req, res) { // Display a web page table res.write('<html><body>'); res.write("<h3> The User Information Table </h3>"); res.write("<table><tr style='background-color:#006633'>"); res.write('<th width="150" style="color:#ffff99">Name</th>'); res.write('<th width="150" style="color:#ffff99">Password</th>'); res.write('<th width="150" style="color:#ffff99">Option</th><tr>'); // Retrieve data from table User on the server // and display it in a web page table structure db.all('SELECT * FROM users', function(err, rows){ rows.forEach(function (row){ res.write('<tr style="background-color:#ccffcc">'); res.write('<td width="150" align="center">'+row.name+'</td>'); res.write('<td width="150" align="center">'+row.password+'</td>'); res.write('<td width="150" align="center">'+row.option+'</td></tr>'); }); res.write('</table>'); res.write('</body></html>'); res.send(); }); }); // create a Node.js server that listens on port 3000. app.listen(3000, function () { console.log('Example app listening on port 3000!'); }) ``` ------------------------------------------------ 下面是html ---------------------------------- ``` <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>Node Express</title> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <h3> My First Express Server... </h3> <form action="/users" method="post"> <div class="form-group"> <label for="usr">Name:</label> <input type="text" class="form-control" name="name" id="usr"> </div> <div class="form-group"> <label for="pwd">Password:</label> <input type="password" class="form-control" name="password" id="pwd"> </div> <label class="radio-inline"><input type="radio" name="optradio" value="1">Option 1</label> <label class="radio-inline"><input type="radio" name="optradio" value="2">Option 2</label> <label class="radio-inline"><input type="radio" name="optradio" value="3">Option 3</label> <br><br> <button type="submit" value="Create Profile" class="btn btn-primary">Submit</button> </form> <br> <form action="/users" method="get"> <button type="submit" value="Get Users" class="btn btn-primary">Get Users</button> </form> </div> </body> </html> ``` -----------------------------------------
Node.js 项目：微信回调模式认证，为什么没人接？_course
2017-04-25项目详情链接（可报名竞标）：[微信回调模式认证微信回调模式认证](https://www.clouderwork.com/jobs/48e1f59c554b3c52 "") 需求如下： 1、微信回调模式认证 微信企业号开启回调模式时，需要进行验证，通过微信页面传递给服务器的参数如下 appID: "wx0086c685d14beb7e" encodingAESKey: "EpMLuAwo035P2yg1c7AHcvXuh8jqCfB2bexP78ywsw1", token: "FVKXUDLMqDcdpLuEPzL6xbb3VCG", echostr："i1MnawJvJlOC9RnByQyBUjnI4iNh5RQWplPfzsbMzZdHPBdJC00JBtgpDsFFprTGV5n6v6TtNL0PysXGQ3D3D" 用Node.js将上面的echostr进行解密，返回给微信企业号验证通过 项目采用Node.js+express框架，Node.js的版本为4.4.3，express的版本为4.13.1 2、微信企业号中网页打开时需要进行验证，并取得员工的ID和头像， 3、在后台将员工和部门数据同步到微信企业号 4、完成时间4/27为止，预算金额：2000元 5、提交源代码和相关package
node.js获取前端的table_course
2015-08-12我是初学者 想从前端页面里面把一个table 存到一个excel里面 用的是request。get方法 但是body里面没有table相关信息。 麻烦大神们可以给我一个实例 谢谢
在 node.js 中每次读取一行文件？_course
2011-05-27<div class="post-text" itemprop="text"> <p>I am trying to read a large file one line at a time. I found <a href="http://www.quora.com/What-is-the-best-way-to-read-a-file-line-by-line-in-node-js" rel="noreferrer">a question on Quora</a> that dealt with the subject but I'm missing some connections to make the whole thing fit together.</p> <pre><code> var Lazy=require("lazy"); new Lazy(process.stdin) .lines .forEach( function(line) { console.log(line.toString()); } ); process.stdin.resume(); </code></pre> <p>The bit that I'd like to figure out is how I might read one line at a time from a file instead of STDIN as in this sample.</p> <p>I tried: </p> <pre><code> fs.open('./VeryBigFile.csv', 'r', '0666', Process); function Process(err, fd) { if (err) throw err; // DO lazy read } </code></pre> <p>but it's not working. I know that in a pinch I could fall back to using something like PHP, but I would like to figure this out. </p> <p>I don't think the other answer would work as the file is much larger than the server I'm running it on has memory for. </p> </div> <p>转载于:https://stackoverflow.com/questions/6156501/read-a-file-one-line-at-a-time-in-node-js</p>
Node.JS和PHP AES-128-EBC数据加密_course
2012-08-10<div class="post-text" itemprop="text"> <p>I'm trying to generate an encrypted block of data in javascript (node.js), and then pass to another system via HTTP. I've been given a reference system in php to compare my results with.</p> <p>For reasons that are seemingly beyond my grasp I cannot get my javascript version to produce the same encrypted data as the PHP version. I've checked that the keys I'm using are the same. Does anyone have any clues or tips what so ever on what I'm doing wrong.</p> <p>(Yes I know the ECB is bad, but it's not my choice)</p> <h3>Reference PHP implementation</h3> <pre><code><?php function getEncrypt($str, $key) { $realKey = substr($key, 0, 16); $padding = pkcs5_pad($str, 16); return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $realKey, $padding, MCRYPT_MODE_ECB)); } function pkcs5_pad ($text, $blocksize) { $pad = $blocksize - (strlen($text) % $blocksize); return $text . str_repeat(chr($pad), $pad); } $key = "oi3sgkosQPIdFa0eVSjecIhkha2nAfpn3anAozln0e9rkIGPvzUBgToCtlXLsKyjBITGKozHmn1NArgQodawidiVnyxccsf8ZnUgof4kq0iBCS7wrG1raytauMusRjjb"; $string = '{"pol.start":"11-06-2012 09:00:00","pol.end.after":43200,"lic.cache":"yes","playback":2880,"out.digital":"use","out.analog":"use"}'; $encData = getEncrypt($string, $key); var_dump($encData); </code></pre> <h3>My Javascript attempt:</h3> <pre><code>var crypto = require('crypto'); var cipherAlgo = 'AES-128-ECB'; var policy = '{"pol.start":"11-06-2012 09:00:00","pol.end.after":43200,"lic.cache":"yes","playback":2880,"out.digital":"use","out.analog":"use"}'; var sharedSecret = 'oi3sgkosQPIdFa0eVSjecIhkha2nAfpn3anAozln0e9rkIGPvzUBgToCtlXLsKyjBITGKozHmn1NArgQodawidiVnyxccsf8ZnUgof4kq0iBCS7wrG1raytauMusRjjb'; var util = require('util'); function encrypt(string, key) { var realKey = key.substring(0,16); var cipher = crypto.createCipher(cipherAlgo, key.substring(0,16)); //encrypt our string var encrypted = cipher.update(string, 'utf8', 'base64'); encrypted += cipher.final('base64'); return encrypted; } console.log(encrypt(policy, sharedSecret)); </code></pre> <p>I have tried lots of things like rejigging output to binary, putting into a buffer and base64ing that etc etc.<br> For the love of my sanity can someone help on this.</p> </div>
Node.js数据传输_course
2014-11-17<div class="post-text" itemprop="text"> <p>I am transferring data from node to PHP. I am using same url to transfer data and may require to call it for more than 10 times in a loop, but it only accepts 5 times. The next 5 will be error (parse error). How to fix it?</p> <p>code</p> <pre><code>function win_settings_fn(noos) { var str=""; var len = str.length ; win_settings.headers = {'Content-length' : len, 'Content-Type': 'application/x-www-form-urlencoded'} var request = http.request(win_settings, function (response) { response.on('data', function (data) { var response= JSON.parse(data); console.log(str+"respose ..........."+noos); }); response.on('error', function (err) { }); response.on('end', function () { }); }); request.on('error', function (err) { console.log("failed.............."+noos); }); request.write(str +"\0"); request.end(); } </code></pre> <p>This is the code am using.</p> <p>if I call</p> <pre><code>win_settings_fn(1) win_settings_fn(2) win_settings_fn(3) win_settings_fn(4) win_settings_fn(5) win_settings_fn(6) win_settings_fn(7) win_settings_fn(8) win_settings_fn(9) win_settings_fn(10) </code></pre> <p>The result is</p> <pre><code>respose ...........1 respose ...........2 respose ...........3 respose ...........4 respose ...........5 failed..............6 failed..............7 failed..............8 failed..............9 respose ...........10 </code></pre> <p>Why is it so? Is there any issue with sending the data?</p> </div>
node.js访问hdfs文件并写入本地文件系统_course
2015-12-24我是nodejs初学者，现在项目需要使用node.js去访问hdfs文件系统中的文件，查阅相关资料，说推荐使用webhdfs模块，创建client后读取数据流，再pipe到本地文件系统，code如下： demo.js ``` var WebHDFS = require('webhdfs'); var fs = require('fs'); hdfs = WebHDFS.createClient({ user:'root', host:'192.168.1.241', port:80, path:'/user/root/spark_lib/' }); var localFileStream = fs.createWriteStream('/home/tera/workspace/t2/localFile.txt'); var remoteFileStream = hdfs.createReadStream('hdfs://192.168.1.241:8020/user/root/spark_lib/remoteFile.txt'); console.log(remoteFileStream); remoteFileStream.pipe(localFileStream); localFileStream.on('finish', function onFinish() { console.log('finish'); }); localFileStream.on('error', function onError(err) { console.log(err); }); ``` 执行以上代码后本地生成localFile.txt但文件为空，求建议。
node.js读取图片并返回游览器_course
2017-11-23我是入门的小白，求给位大哥指点指点，怎么在node.js中把图片文件夹返回给游览器
如何提高Node.js Express Server响应时间_course
2019-04-12<div class="post-text" itemprop="text"> <p>I'm trying to improve the Server Response Time of an angular 6 app. At the beginning this app was being hosted as simple production of angular over an apache2 web server. After I updated this app to universal, meaning now it is being run over node.js with express, I noticed that the Server Response time increased really high. I tried using cache headers but nothing seam to make a difference. </p> <p>The comparison is illustrated by inspecting the network on google chrome:<br><br> <b>BEFORE</b><br><br> <img src="https://i.imgur.com/CwoLYve.png" alt="before"><br><br> <b>AFTER</b><br><br> <img src="https://i.imgur.com/T8Hfe2h.png" alt="after"><br><br></p> <p>Could this be because of the proxy or redirection to the port which the app is listening ?</p> </div>
【node.js新手入门】急~小黑框CMD中的问题怎么解决吗_course
2019-09-11** 问题： 1、CMD中红框内的“prototype:null”的原因是什么？这个问题要怎么解决吗？** 以下是router.js内容： ``` var fs = require('fs') //Express 提供了一种更好的方式 var express = require('express') var router = express.Router() router.get('/', function(req, res){ res.send('index page') }) router.get('/students',function(req, res){ fs.readFile('./db.json', 'utf8',function(err, data){ if(err){ return res.status(500).send('Server error.') } //从文件中读取到的数据一定是字符串 //所以这里一定要手动转换为对象 var students = JSON.parse(data).students console.log(data) res.render('index.html',{ fruits: [ '苹果', '香蕉', '橘子' ], students: students }) }) }) router.get('/students/new', function(req, res){ res.render('new.html') }) router.post('/students/new', function(req, res){ //1、获取表单数据 //2、处理 //3、发送相应 console.log(req.body) }) router.get('/students/edit', function(req, res){ }) router.post('/students/edit', function(req, res){ }) router.get('/students/delete', function(req, res){ }) //3. 把router 导出 module.exports = router ``` 以下是cmd内容：  求大神指点~~~
.微信小程序中form表单存入到mysql中，求利用腾讯云中的node.js实现代码_course
2018-05-04客户端代码： formSubmit: function (e) { var that = this; var formData = e.detail.value; console.log(formData); wx.request({ url: config.service.dataReportUrl, data: formData, header: { 'Content-Type': 'application/json' }, success: function (res) { console.log(res.data) that.modalTap(); } }) }, 服务器端代码不知道怎么写了 module.exports = ctx => { ..... } 麻烦大神帮忙填一下空，谢谢！
如何在 Node.js 中提取 POST 数据？_course
2010-11-28<div class="post-text" itemprop="text"> <p>How do you extract form data (<code>form[method="post"]</code>) and file uploads sent from the HTTP <code>POST</code> method in <a href="http://en.wikipedia.org/wiki/Node.js">Node.js</a>?</p> <p>I've read the documentation, googled and found nothing.</p> <pre><code>function (request, response) { //request.post???? } </code></pre> <p>Is there a library or a hack?</p> </div> <p>转载于:https://stackoverflow.com/questions/4295782/how-do-you-extract-post-data-in-node-js</p>
node.js将数据发送到客户端？_course
2013-02-17<div class="post-text" itemprop="text"> <p>I wonder how can I send data from node.js to client?</p> <p>example node.js code -</p> <pre><code>var http = require('http'); var data = "data to send to client"; var server = http.createServer(function (request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.end("Hello World "); }).listen(8125); </code></pre> <p>Now, I want to send the <code>data</code> variable to client and log it with JavaScript.. <br> How can I do that?<br></p> <p>Thanks ;)</p> <p><b>EDIT:</b> Does anyone know how to send array?</p> </div>
程序员的兼职技能课
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