微信小程序开发问题提问

Question

控制台输出this.data.abc没有数据，点击三角号才显示，也无法渲染到wxml页面上。

for_await_box: async function (i, _, data_all, users_collection_id_list) {
        await db.collection("daiyue_news_" + i).where({
            _id: _.in(users_collection_id_list)
        }).get({
            success: async (res) => {
                console.log("res.data:", res.data)
                //解构数组
                data_all.push(...res.data)
            }
        })
    },

    get_users_collection_data: async function (users_collection_id_list) {
        return new Promise((resolve, reject) => {
            const _ = db.command
            const data_all = []
            for (let i = 0; i < 3; i++) {
                this.for_await_box(i, _, data_all, users_collection_id_list)
                resolve(data_all)
            }
        })
    },

    /**
     * 生命周期函数--监听页面加载
     */
    async onLoad(options) {
        var users_information_all = await app.get_db_users_information()
        // console.log("users_information_all:", users_information_all)
        var users_collection_id_list = users_information_all.data[0].collection_add_news_id
        // console.log("users_collection_id_list:", users_collection_id_list)
        var data_all = await this.get_users_collection_data(users_collection_id_list)
        console.log("data_all:",data_all)
        this.setData({
            data_all: data_all,
            users_information_all:users_information_all
        })
        console.log("this.data.data_all:", this.data.data_all)
        console.log("this.data.users_information_all:", this.data.users_information_all)
    },

``````

```

Answer 1

改下面就行

Page({

    /**
     * 页面的初始数据
     */
    data: {
        data_all: []
    },
    for_await_box: function (i, _, data_all, users_collection_id_list) {
        return new Promise((resolve, reject) => {
            db.collection("daiyue_news_" + i).where({
                _id: _.in(users_collection_id_list)
            }).get({
                success: async (res) => {
                    console.log("res.data:", res.data)
                    //解构数组
                    //data_all.push(...res.data)
                    resolve(res.data);///不能直接push，这样是请发请求
                }
            })
        });
    },

    get_users_collection_data: async function (users_collection_id_list) {
        return new Promise(async (resolve, reject) => {////
            const _ = db.command
            const data_all = []
            for (let i = 0; i < 3; i++) {
                //要在这里await等待for_await_box查询的结果，控制for循序执行，没有await这里是并发调用for_await_box，无法控制顺序
                var data = await this.for_await_box(i, _, data_all, users_collection_id_list)
                data_all.push(...data)
            }
            resolve(data_all)/////
        })

    },

    /**
     * 生命周期函数--监听页面加载
     */
    async onLoad(options) {
        var users_information_all = await app.get_db_users_information()
        // console.log("users_information_all:", users_information_all)
        var users_collection_id_list = users_information_all.data[0].collection_add_news_id
        // console.log("users_collection_id_list:", users_collection_id_list)
        var data_all = await this.get_users_collection_data(users_collection_id_list)
        console.log("data_all:",data_all)
        this.setData({
            data_all: data_all,
            users_information_all:users_information_all
        })
        console.log("this.data.data_all:", this.data.data_all)
        console.log("this.data.users_information_all:", this.data.users_information_all)
    }