How does the WeChat applet ensure that every page has been logged in? This article will introduce you to the method of mini program to ensure that every page is logged in. I hope it will be helpful to you!

In a WeChat applet, there is a home page, a personal page, some list pages, detail pages, etc. Most of these pages can be shared. When the shared page is opened by another user, how does this page ensure that the user is logged in?

There are many solutions on the Internet that add an interception to the request encapsulation. If there is no token, first call the login request to obtain the token, and then continue. There is nothing wrong with this solution. Just pay attention to one thing. When multiple requests are triggered on a page at the same time, after all requests are intercepted, they are placed in an array. After successfully obtaining the token, just traverse the array one request at a time.

But this requirement is a little more complicated. For example, chain convenience store applet, most pages need to have a store (because it is necessary to obtain the inventory, price, etc. of the current store products based on the store). This store is based on the current store. Positioning is obtained by calling the background interface. At this time, it would be too troublesome to encapsulate it in the request.

Solution

First of all, we noticed that logging in, getting the position and our page request are asynchronous, we need to ensure that the page request It is after logging in and obtaining positioning, but if we write it again for every page, the maintainability will be too poor. So we can extract a way to do this. So the code is like this:

const app = getApp()
Page({
  data: {
    logs: []
  },
  onLoad() {
    app.commonLogin(()=>{
        // 處理頁頁面請求
    })
  }
})

Doing this seems to solve our problem, but think about it again, if you want to do more, such as unified processing of onShareAppMessage for each page, but I I don’t want to write it again on every page. In addition, I want to implement a watch for each page myself. How to do it?

Further solution

We can see that the WeChat applet, each page is a Page(), then we can give this Page Adding a layer of shell outside, we can have a MyPage to replace this Page. Without further ado, here is the code:

tool.js Related code

/**
   * 處理合并參數(shù)
   */
  handlePageParamMerge(arg) {
    let numargs = arg.length; // 獲取被傳遞參數(shù)的數(shù)值。
    let data = {}
    let page = {}
    for (let ix in arg) {
      let item = arg[ix]
      if (item.data && typeof (item.data) === 'object') {
        data = Object.assign(data, item.data)
      }
      if (item.methods && typeof (item.methods) === 'object') {
        page = Object.assign(page, item.methods)
      } else {
        page = Object.assign(page, item)
      }
    }
    page.data = data
    return page
  }

  /***
   * 合并頁面方法以及數(shù)據(jù), 兼容 {data:{}, methods: {}} 或 {data:{}, a:{}, b:{}}
   */
  mergePage() {
    return this.handlePageParamMerge(arguments)
  }

  /**
   * 處理組件參數(shù)合并
   */
  handleCompParamMerge(arg) {
    let numargs = arg.length; // 獲取被傳遞參數(shù)的數(shù)值。
    let data = {}
    let options = {}
    let properties = {}
    let methods = {}
    let comp = {}
    for (let ix in arg) {
      let item = arg[ix]
      // 合并組件的初始數(shù)據(jù)
      if (item.data && typeof (item.data) === 'object') {
        data = Object.assign(data, item.data)
      }
      // 合并組件的屬性列表
      if (item.properties && typeof (item.properties) === 'object') {
        properties = Object.assign(properties, item.properties)
      }
      // 合組件的方法列表
      if (item.methods && typeof (item.methods) === 'object') {
        methods = Object.assign(methods, item.methods)
      }
      if (item.options && typeof (item.options) === 'object') {
        options = Object.assign(options, item.options)
      }
      comp = Object.assign(comp, item)
    }
    comp.data = data
    comp.options = options
    comp.properties = properties
    comp.methods = methods
    return comp
  }

  /**
   * 組件混合 {properties: {}, options: {}, data:{}, methods: {}}
   */
  mergeComponent() {
    return this.handleCompParamMerge(arguments)
  }

  /***
   * 合成帶watch的頁面
   */
  newPage() {
    let options = this.handlePageParamMerge(arguments)
    let that = this
    let app = getApp()

    //增加全局點擊登錄判斷
    if (!options.publicCheckLogin){
      options.publicCheckLogin = function (e) {
        let pages = getCurrentPages()
        let page = pages[pages.length - 1]
        let dataset = e.currentTarget.dataset
        let callback = null

        //獲取回調(diào)方法
        if (dataset.callback && typeof (page[dataset.callback]) === "function"){
          callback = page[dataset.callback]
        }
        // console.log('callback>>', callback, app.isRegister())
        //判斷是否登錄
        if (callback && app.isRegister()){
          callback(e)
        }
        else{
          wx.navigateTo({
            url: '/pages/login/login'
          })
        }
      }
    }

    const { onLoad } = options
    options.onLoad = function (arg) {
      options.watch && that.setWatcher(this)
      onLoad && onLoad.call(this, arg)
    }

    const { onShow } = options
    options.onShow = function (arg) {
      if (options.data.noAutoLogin || app.isRegister()) {
        onShow && onShow.call(this, arg)
        //頁面埋點
        app.ga({})
      }
      else {
        wx.navigateTo({
          url: '/pages/login/login'
        })
      }
    }

    return Page(options)
  }

  /**
   * 合成帶watch等的組件
   */
  newComponent() {
    let options = this.handleCompParamMerge(arguments)
    let that = this
    const { ready } = options
    options.ready = function (arg) {
      options.watch && that.setWatcher(this)
      ready && ready.call(this, arg)
    }
    return Component(options)
  }

  /**
    * 設(shè)置監(jiān)聽器
    */
  setWatcher(page) {
    let data = page.data;
    let watch = page.watch;
    Object.keys(watch).forEach(v => {
      let key = v.split('.'); // 將watch中的屬性以'.'切分成數(shù)組
      let nowData = data; // 將data賦值給nowData
      for (let i = 0; i < key.length - 1; i++) { // 遍歷key數(shù)組的元素，除了最后一個！
        nowData = nowData[key[i]]; // 將nowData指向它的key屬性對象
      }

      let lastKey = key[key.length - 1];
      // 假設(shè)key===&#39;my.name&#39;,此時nowData===data[&#39;my&#39;]===data.my,lastKey===&#39;name&#39;
      let watchFun = watch[v].handler || watch[v]; // 兼容帶handler和不帶handler的兩種寫法
      let deep = watch[v].deep; // 若未設(shè)置deep,則為undefine
      this.observe(nowData, lastKey, watchFun, deep, page); // 監(jiān)聽nowData對象的lastKey
    })
  }

  /**
   * 監(jiān)聽屬性 并執(zhí)行監(jiān)聽函數(shù)
   */
  observe(obj, key, watchFun, deep, page) {
    var val = obj[key];
    // 判斷deep是true 且 val不能為空 且 typeof val===&#39;object&#39;（數(shù)組內(nèi)數(shù)值變化也需要深度監(jiān)聽）
    if (deep && val != null && typeof val === &#39;object&#39;) {
      Object.keys(val).forEach(childKey => { // 遍歷val對象下的每一個key
        this.observe(val, childKey, watchFun, deep, page); // 遞歸調(diào)用監(jiān)聽函數(shù)
      })
    }
    var that = this;
    Object.defineProperty(obj, key, {
      configurable: true,
      enumerable: true,
      set: function (value) {
        if (val === value) {
          return
        }
        // 用page對象調(diào)用,改變函數(shù)內(nèi)this指向,以便this.data訪問data內(nèi)的屬性值
        watchFun.call(page, value, val); // value是新值，val是舊值
        val = value;
        if (deep) { // 若是深度監(jiān)聽,重新監(jiān)聽該對象，以便監(jiān)聽其屬性。
          that.observe(obj, key, watchFun, deep, page);
        }
      },
      get: function () {
        return val;
      }
    })
  }

Page code:

app.tool.newPage({
  data: {
    // noAutoLogin: false
  },
  onShow: function () {
    // 在這里寫頁面請求邏輯
  }
}

Finally

The code has been running online for a long time. You can add it according to your needs through the newPage package in the tool. In short, I am here to provide an idea. If you have a better idea, please share it.

[Related learning recommendations: 小program development tutorial]

The above is the detailed content of A brief discussion on how to ensure that each page of the mini program is logged in. For more information, please follow other related articles on the PHP Chinese website!