How to assign values ​​to global variables in WeChat applet

How to assign values ​​to global variables in WeChat mini programs

Global variables in mini programs can be defined in globalData, as follows Let’s introduce how to use globalData.

Recommended learning: Small program development

1. First define global variables in app.js

App({
  onLaunch: function () {
  },
   globalData: {
     age: "18"
   }
})

2. Then in a certain To reference this global variable in the page

first declare var app=getApp(); under the file and then reference and assign the global variable.

//将全局变量的值赋给页面的一个变量
//index.js
var app = getApp()
Page({
  data: {
    age: ""
  },
  onLoad: function () {
    this.setData({
      age: app.globalData.age,
    });
  }
})

3. If you want to change the global variable, that is, reassign the value, you can write like this

//更改全局变量的值
var app = getApp()
Page({
  data: {
    age: ""
  },
  onLoad: function () {
    app.globalData.age="20"
    console.log(app.globalData.age)
  }
})

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