微信小程序前端promise封装代码实例

const config = {
 base_url_api : "https://douban.uieee.com/v2/movie/",
}

export {config}

import { config } from "../config";
class HTTP {
 requset({ url, method = "GET", data = {} }) {
 const promise = new Promise((resolve, reject) => {
 wx.request({
 url: config.base_url_api + url,
 data,
 method,
 header: {
 'Content-Type': 'json'
 },
 success: res => {
 //状态码 toString() 转成字符串
 const statusCode = res.statusCode.toString();

 if (statusCode.startsWith("2")) {
 resolve(res.data)
 } else {
 this._show_error();
 }
 },
 fail: res => {
 reject(err);
 this._show_error();
 }
 })
 })
 return promise;
 }
 _show_error() {
 wx.showToast({
 title: '网络错误',
 icon: 'none'
 })
 }
}
export { HTTP }

import {HTTP} from "../utils/http";
class MovieModel extends HTTP{
 getInTheaters(){
 return this.requset({
 url:"in_theaters"
 })
 }
 getTop250(){
 return this.requset({
 url:"top250"
 })
 }
 getComingSoon(){
 return this.requset({
 url:"coming_soon"
 })
 }
}
export {MovieModel};

const app = getApp();
import {MovieModel} from "../../model/movie";
const movieModel = new MovieModel();
Page({
 onLoad(){
 // movieModel.getInTheaters().then(res=>{
 // console.log(res)
 // })
 const inTheaters = movieModel.getInTheaters()
 const top250 = movieModel.getTop250();
 const comingSoon = movieModel.getComingSoon();
 Promise.all([inTheaters,top250,comingSoon]).then(res=>{
 let[inTheaters,top250,comingSoon] = res;
 console.log(inTheaters)
 })
 }
})