小程序封装wx.request，以及调用

1、新建一个api目录，与pages同级

2、在api目录下新建一个api.js文件

3、编写代码

const host = 'http://test.test.cn'
const wxRequest = function (params, url) {
  wx.showToast({
    title: '加载中...',
    icon: 'loading'
  })
  wx.request({
    url: url,
    method: params.method || 'GET',
    data: params.data || {},
    header: {
      'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8'
    },
    success: function (res) {
      params.success && params.success(res)
      wx.hideToast()
    },
    fail: function (res) {
      params.fail && params.fail(res)
    },
    complete: function (res) {
      params.complete && params.complete(res)
    }
  })
}

const bindCode = function (params) { wxRequest(params, host + '/AppPhone/Api') }
const startScan = function (params) { wxRequest(params, host + '/AppPhone/Api') }
const imgToservers =  function (params) { wxRequest(params, host + '/AppPhone/Api/upload_files') }

module.exports = {
  bindCode,
  startScan,
  imgToservers
}

4、在js中调用

import api from '../../api/api.js'
Page({

  /**
   * 页面的初始数据
   */
  data: {
    shopCode: '',
    deviceId: '',
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    var getShopInfo = wx.getStorageSync('shopInfo');
    if (getShopInfo) {
      this.setData({
        shopCode: getShopInfo.shop_code,
        deviceId: getShopInfo.device_id
      })
    }else{
      wx.redirectTo({
        url: '../bindnum/bindnum?type=1'
      })
    }
  },
  beginScan: function(){
    var _that = this;
    api.startScan({
      method: 'POST',
      data: {
        shop_code: this.data.shopCode,
        device_id: this.data.deviceId,
        method: 'get_phone_scanner_id'
      },
      success: function(res){
        console.log(res.data);
      }
    });
  },
})

5、问题

一开始wx.request中header设置为

header: {
    'content-type': 'application/json' // 默认值
},

导致接口调用时，报500

后面查找发现，终于找到了解决方案，将header设置为：

  header: {
      'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8'
  },

就可以成功调用了

参考文章： wx.request发送与服务端接受