shibeirencai_wechat/utils/http.js

import { config } from '../config.js'
import { store } from './store.js'

const Method = {
  GET: 'GET',
  POST: 'POST'
}
// 定义一些通用常量
const HTTPConst = {
  TokenURL: '/api/miniuser/getToken'
}
class HTTP {
  constructor() {
    this.baseUrl = config.api_url
  }
  request = (params) => {
    // 从缓存中读取 token
    // let token = wx.getStorageSync(HTTPConst.TokenStoreKey) || ''
    const token = store.readToken()
    let url = this.baseUrl + params.url
    //console.log(params.url)
    if (!params.method) {
      params.method = Method.GET
    }
    // token 拼接到 请求体中
    let data = params.data
    //console.log('请求Header和Body参数：')
    let header = {
      'token': token,
      'content-type': 'application/json',
    }
    //console.log(header)
    //console.log(data || {})
    wx.request({
      url: url,
      data: data,
      header: header,
      method: params.method,
      dataType: 'json',
      success: (res) => {
        //console.log(res.data)
        let code = res.statusCode.toString()
        let startCode = code.charAt(0)
        if (startCode == '2') {
          if (res.data.code == 200 || res.data.code == 0) {
            params.success && params.success(res.data)
          } else if (res.data.code == 302) {
            // token 无效
            this.fetchAuthToken(res => {
              // 请求Token后，重新请求URL
              if (res.code == 200) {
                this.request(params)
              }
            })
          } else {
            //console.log('数据请求失败')
            wx.showToast({
              title: res.data.message || '服务器错误，请稍后重试',
              icon: 'none'
            })
          }
        } else {
          //console.log('请求错误')
          wx.showToast({
            title: '服务器错误！',
            icon: 'none'
          })
          params.error && params.error(res)
        }
      },
      fail: function (res) {
        wx.showToast({
          title: '网络连接错误，请求稍后重试！',
          icon: 'none'
        })
        params.fail && params.fail(res)
      },
    })
  }
  // 获取 Token
  fetchAuthToken (success) {
    // 获取token
    this._fetchWXCode().then(res => {
      //console.log('啦啦啦啦凉啊')
      //console.log(res)
      if (!res) return
      let params = {
        url: HTTPConst.TokenURL,
        method: Method.POST,
        data: {
          code: res
        },
        success: (data) => {
          // 将获取到的token存放起来
          const { token, userInfo } = data.result
          store.saveToken(token)
          store.saveUserInfo(userInfo)
          success(data)
        },
      }
      this.request(params)
    })
  }
  // 获取微信code 
  _fetchWXCode () {
    return new Promise(resolve => {
      wx.login({
        success (res) {
          //console.log('获取Code成功 ' + res.code)
          resolve(res.code)
        }
      })
    })
  }
}
export { HTTP, Method, HTTPConst }