微信小程序 引入es6 promise
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()
})
}
})
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