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This article mainly explains "how to define the scope of this in Mini Program development", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "how to define the this scope in Mini Program development".

This scope

When debugging, this may not report errors because of the definition, so it is very troublesome to debug, so we should pay special attention to it.

OnLoad: function () {var that = this wx.request ({url: 'https:// domain name / AppService/UserHandler.ashx', data: {}, method:' GET', header: {'Content-Type':' application/json'} Success: function (res) {that.setData ({})}, fail: function (res) {}})}

Async

Request is an asynchronous request, so the return value of a sibling function, a request and a get request cannot be obtained, so you need to use a callback function

TLS version

When requesting data, you will be prompted that a TLS version cannot be higher than 1.0. check "Development environment does not verify the request domain name and TLS version" in the project.

Https

Mini Program only supports https bound with domain name, and configure it in request of Mini Program management interface.

Global variable

-> definition

/ / app.jsApp ({onLaunch: function () {}, globalData: {userInfo: null}})

-> assignment

/ / index.js// gets the application instance var app = getApp () Page ({data: {userInfo: {})

-> get to use

/ / user.js// get application instance var app = getApp () Page ({/ / page initial data data: {userInfo: null}, onLoad: function () {this.setData ({userInfo: getApp (). GlobalData.userInfo,})}) so far, I believe you have a better understanding of "how to define this scope in Mini Program development". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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