WeChat Mini Program Development Series (3) Detailed explanation of the life cycle of APP

This article tells a detailed explanation of the life cycle of the WeChat mini program development series (3) APP

This series is a detailed explanation by the author from the beginning. It is suitable for beginners to watch and learn step by step according to the series;

1: Life cycle method of WeChat Mini Program APP:

Add the method shown in Figure 1 to app.js in the WeChat Mini Program project

Figure 1

Compile and run, view the logs as shown in Figure 2 and Figure 3: When the WeChat applet starts, the life cycle method called is: onLaunch method (app.js) --- onShow method (app. js) --- onLoad method (home page: onLoad method of index.js)

##Figure 2

Figure 3

When the mini program is placed in the background (there is a simulated background button in the lower left corner of the development tool), the system calls back the life cycle method: onHide

Figure 4

#2: Call the global methods and variables of the mini program APP level

You can customize global variables in app.js: For example, add the following code

myData:{
username : "abc123"
},



If you want to call the global variable: username in index.js, as shown in Figure 5 Shown: First get the global app, then get myData through the app, and then get the username

Figure 5

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