小程序封装Promise请求

思路：

let url = 'http://localhost:8080';
let requestTotal = 0;
const request = (params) =>{
  requestTotal++;
  wx.showLoading({
   title: '加载中...',
   mask: true
  })
  return new Promise((resolve, reject) =>{
    wx.request({
      url: url + params.url,
      data: params.data || {},
      method: params.method || 'GET',
      header: {'content-type': 'application/x-www-form-urlencoded;charset=UTF-8'},
      success:(result)=>{
        resolve(result.data)
      },
      fail:(error)=>{
        console.log(error);
        reject(error)
      },
      complete:()=>{
        requestTotal--;
        if(requestTotal===0){
         wx.hideLoading()
        }
      }
    })
  })
}