微信小程序开发两个月了.大家的项目都在不断迭代.已经不是小程序.这时候就会遇到多层回调嵌套的问题.有些目不忍视了.迫不得已引入es6-promise.在微信小程序内测的时候promise不需要手动引入,后来被微信移除了.看看效果.

promise详细的介绍我就不说了.有很多大神写过.

看看目录,引入es6-promise就可以用了.

目录

1.网络请求 wxRequest.js

这里只写了get和post.

我经常会在网络请求的时候用微信原生showToast(),所以最后加了finally,方便hideToast()

var Promise = require('../plugins/es6-promise.js')

function wxPromisify(fn) {

return function (obj = {}) {

return new Promise((resolve, reject) => {

obj.success = function (res) {

//成功

resolve(res)

}

obj.fail = function (res) {

//失败

reject(res)

}

fn(obj)

})

}

}

//无论promise对象最后状态如何都会执行

Promise.prototype.finally = function (callback) {

let P = this.constructor;

return this.then(

value => P.resolve(callback()).then(() => value),

reason => P.resolve(callback()).then(() => { throw reason })

);

};

/**

* 微信请求get方法

* url

* data 以对象的格式传入

*/

function getRequest(url, data) {

var getRequest = wxPromisify(wx.request)

return getRequest({

url: url,

method: 'GET',

data: data,

header: {

'Content-Type': 'application/json'

}

})

}

/**

* 微信请求post方法封装

* url

* data 以对象的格式传入

*/

function postRequest(url, data) {

var postRequest = wxPromisify(wx.request)

return postRequest({

url: url,

method: 'POST',

data: data,

header: {

"content-type": "application/x-www-form-urlencoded"

},

})

}

module.exports = {

postRequest: postRequest,

getRequest: getRequest

}

2.微信其他API wxApi.js

var Promise = require('../plugins/es6-promise.js')

function wxPromisify(fn) {

return function (obj = {}) {

return new Promise((resolve, reject) => {

obj.success = function (res) {

//成功

resolve(res)

}

obj.fail = function (res) {

//失败

reject(res)

}

fn(obj)

})

}

}

//无论promise对象最后状态如何都会执行

Promise.prototype.finally = function (callback) {

let P = this.constructor;

return this.then(

value => P.resolve(callback()).then(() => value),

reason => P.resolve(callback()).then(() => { throw reason })

);

};

/**

* 微信用户登录,获取code

*/

function wxLogin() {

return wxPromisify(wx.login)

}

/**

* 获取微信用户信息

* 注意:须在登录之后调用

*/

function wxGetUserInfo() {

return wxPromisify(wx.getUserInfo)

}

/**

* 获取系统信息

*/

function wxGetSystemInfo() {

return wxPromisify(wx.getSystemInfo)

}

module.exports = {

wxPromisify: wxPromisify,

wxLogin: wxLogin,

wxGetUserInfo: wxGetUserInfo,

wxGetSystemInfo: wxGetSystemInfo

}

3.用法

promise应用场景很多,下面是promise最基本的用法,在then()中returnpromise对象.

这样有效解决了回调嵌套的问题.让代码看起来更优雅.可读性更高.

var util = require('../../utils/util')

var wxApi = require('../../utils/wxApi')

var wxRequest = require('../../utils/wxRequest')

import config from '../../utils/config'

//获取应用实例

var app = getApp()

Page({

data: {

userInfo: {}

},

onLoad: function () {

var that = this;

wx.showToast({

title: '加载中',

icon: 'loading',

duration: 10000

})

//1.获取code

var wxLogin = wxApi.wxLogin()

wxLogin().then(res => {

console.log('1.成功了')

console.log(res.code)

var url = config.getOpenidUrl;

var params = {

appid: "wxed7******2d465",

secret: "e9c5e4c******09ecc5ebd811",

js_code: res.code,

grant_type: "authorization_code"

}

//2.获取openid

return wxRequest.getRequest(url, params)

}).

then(res => {

console.log('2.成功了')

console.log(res)

var url = app.globalData.ip + config.searchDgUrl

var data = util.json2Form({ phoneNumber: '15971908021' })

//3.获取绑定手机号码

return wxRequest.postRequest(url, data)

}).

then(res => {

console.log('3.成功了')

console.log(res)

//4.获取系统信息

var wxGetSystemInfo = wxApi.wxGetSystemInfo()

return wxGetSystemInfo()

}).

then(res => {

console.log('4.成功了')

console.log(res)

//5.获取用户信息

var wxGetUserInfo = wxApi.wxGetUserInfo()

return wxGetUserInfo()

}).

then(res => {

console.log('5.成功了')

console.log(res.userInfo)

that.setData({

userInfo: res.userInfo

})

})

.finally(function (res) {

console.log('finally~')

wx.hideToast()

})

}

})

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持脚本之家！