微信小程序wx.request的简单封装

/**
 * name: api.js
 * description: request处理基础类
 * author: 徐磊
 * date: 2018-5-19
 */
class request {
 constructor() {
  this._header = {}
 }

/**
 * 设置统一的异常处理
 */
 setErrorHandler(handler) {
  this._errorHandler = handler;
 }

 /**
  * GET类型的网络请求
  */
 getRequest(url, data, header = this._header) {
  return this.requestAll(url, data, header, 'GET')
 }

 /**
  * DELETE类型的网络请求
  */
 deleteRequest(url, data, header = this._header) {
  return this.requestAll(url, data, header, 'DELETE')
 }

 /**
  * PUT类型的网络请求
  */
 putRequest(url, data, header = this._header) {
  return this.requestAll(url, data, header, 'PUT')
 }

 /**
  * POST类型的网络请求
  */
 postRequest(url, data, header = this._header) {
  return this.requestAll(url, data, header, 'POST')
 }

 /**
  * 网络请求
  */
 requestAll(url, data, header, method) {
  return new Promise((resolve, reject) => {
   wx.request({
    url: url,
    data: data,
    header: header,
    method: method,
    success: (res => {
     if (res.statusCode === 200) {
      //200: 服务端业务处理正常结束
      resolve(res)
     } else {
      //其它错误，提示用户错误信息
      if (this._errorHandler != null) {
      //如果有统一的异常处理，就先调用统一异常处理函数对异常进行处理
       this._errorHandler(res)
      }
      reject(res)
     }
    }),
    fail: (res => {
     if (this._errorHandler != null) {
      this._errorHandler(res)
     }
     reject(res)
    })
   })
  })
 }
}

export default request

/**
 * name: agriknow.js
 * description: 农知汇服务器提供的服务
 * author: 徐磊
 * date: 2018-5-19
 */
import request from './request.js'
class agriknow {
 constructor() {
  this._baseUrl = 'https://apis.xxx.xxx.com/dev/apis/train/v1/'
  this._defaultHeader = { 'data-tupe': 'application/json' }
  this._request = new request
  this._request.setErrorHandler(this.errorHander)
 }

 /**
  * 统一的异常处理方法
  */
 errorHander(res) {
  console.error(res)
 }

 /**
  * 查询所有新闻列表
  */
 getNews(page = 1, size = 10) {
  let data = { page: page, size: size }
  return this._request.getRequest(this._baseUrl + 'news/client', data).then(res => res.data)
 }

 /**
  * 获取所有课程
  */
 getCourseList(page = 1, size = 10, key = null) {
  let data = key != null ? { page: page, size: size, queryValue: key } : { page: page, size: size }
  return this._request.getRequest(this._baseUrl + '/course/mobile', data).then(res => res.data)
 }
}
export default agriknow

import agriknow from './apis/agriknow.js'
App({
 onLaunch: function () {
  // 展示本地存储能力
  var logs = wx.getStorageSync('logs') || []
  logs.unshift(Date.now())
  wx.setStorageSync('logs', logs)
……
……

import agriknow from './apis/agriknow.js'
App({
 onLaunch: function () {
  // 展示本地存储能力
  var logs = wx.getStorageSync('logs') || []
  logs.unshift(Date.now())
  wx.setStorageSync('logs', logs)
……
……
 },
 agriknow:new agriknow()
})

const app = getApp();
Page({
 data: {
  courseData: [],
  page: 1,
  size: 10,
  total: 0
 },
 onLoad: function () {
 ……
 ……
  wx.startPullDownRefresh()
  this.getdataList();
 },
 //查询课程列表
 getdataList() {
  app.agriknow.getCourseList(this.data.page++, this.data.size, '')
   .then(res => {
    wx.stopPullDownRefresh()
    let list = this.data.page > 2 ? this.data.courseData.concat(res.list) : res.list
    this.setData({
     courseData: list
    })
   })
   .catch(res => {
    wx.stopPullDownRefresh()
    wx.showToast({
     title: '出错了！',
     icon: 'none'
    })
   })
 },
 //下拉刷新
 onPullDownRefresh() {
  console.log("下拉刷新");
  this.getdataList();
 },
 ……
 ……
})