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This article mainly explains "how to use WeChat Mini Programs api in JS". 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 use WeChat Mini Programs api in JS.

The reasons for promise

WeChat Mini Programs's api uses object parameter callback mode, which can easily cause callback hell and make the code difficult to read, judge, modify and debug.

WeChat Mini Programs api example

/ / obtain user information wx.getSetting ({success: res = > {if (res.authSetting ['scope.userInfo']) {/ / has been authorized. You can call getUserInfo directly to get avatar nickname without popping up wx.getUserInfo ({success: res = > {/ / you can send res to the backend to decode unionId this.globalData.userInfo = res.userInfo})

When you can see the two layers, the code is very awkward.

Promise Mini Program

Write a common function that can promise Mini Program api

Function promisify (method, options = {}) {return new Promise ((resolve, reject) = > {/ / assign the options object to the method called below options.success = resolve options.fail = err = > {reject (err)} wx [method] (options)})}

Use the example

The extra parameters passed are passed through object deconstruction

Promisify ('getUserInfo'). Then ((res) = > console.log (res)) .catch ((err) = > {console.error (err)}) promisify (' navigateTo', {url}) so far, I believe you have a better understanding of "how to use navigateTo', api in JS". 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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