An example Analysis of scope and Modularization in WeChat Mini Programs
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File scope
Variables and functions declared in the JavaScript file are valid only in that file; variables and functions with the same name can be declared in different files without affecting each other.
Example:
The global application instance can be obtained through the global function getApp (). If you need global data, you can set it in App (), such as:
/ * app.js * / App ({globalData: 1}) / * a.js * / / this is the local variable localValue var localValue ='a' / / get the instance of app.js var app = getApp () / / manipulate the global variable app.globalData++/* b.js through the example of app * / / the variable localValue can be defined repeatedly in different files var localValue ='b' / / if the a.js file is executed first Then what b.js gets is the variable value console.log (getApp (). GlobalData) executed by a.js.
Modularization
We can extract some common code into a separate js file as a module. The module can expose the interface only through module.exports or exports.
Example:
/ * common.js * / function sayHello (name) {console.log (`Hello ${name}! `)} module.exports = {sayHello: sayHello}
In files that need to use these modules, use require (path) to introduce common code
/ * a.js * / var common = require ('common.js') Page ({helloMINA: function () {common.sayHello (' MINA')}}) these are all the contents of this article entitled "sample Analysis of scope and Modularization in WeChat Mini Programs". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
