//全局对象httpClient
httpClient:{
  request:function(method,url,data){
    //返回一个promise实例
    return new Promise( (resolve,reject)=>{
       wx.request({
        url:url,
        data:data,
        mehtod:method,
        success:function(res){
          resolve(res)
        },
        fail:function(res){
          reject(res);
        },
        complete:function(){
          console.log('complete');
        }
      })
    })
  }
  //get方法：用来获取数据
  get:function( url ) {
    return this.request('GET',url);
  },
  //post方法：用来更新数据
  post:function( url,data) {
    resturn this.request('POST',url,data);
  },
  //put方法
  put:function(url,data){
    return this.request('PUT', url, data);
  },
  //delete方法
  delete:function(url,data){
    return this.request('DELETE', url, data);
  }

//获取app实例,从而调用全局对象的函数
var app=getApp();
login:function(){
  var url='http:xxxxx/login';
  var data={
    userName:'xxxxx',
    passwd:'xxxxxx'
  }
  app.httpClient.post( url,data )
    .then( res=>{console.log("请求成功时调用该函数")})
    .catch(res=>{console.log("请求失败时调用该函数")})
}
//为了更好的阅读，也可以将回调函数，定义在外面
//这样
loginSuccess:function(){
  console.log("请求成功时调用该函数")
},
loginFail:function(){
  console.log("请求失败时调用该函数")
},
login:function(){
  var self=this;
  var url='http:xxxxx/login';
  var data={
    userName:'xxxxx',
    passwd:'xxxxxx'
  }
  app.httpClient.post( url,data )
    .then( res=>self.loginSuccess())
    .catch(res=>self.loginFail())
}

// 该函数怎么写，需要跟后端人员协商返回的格式
function getErrorMsgByErrorNo(error_no) {
 let error_msg;
 switch (error_no) {
  case 100: error_msg = '操作失败，请稍后再试！'; break;
  default: error_msg = '网络错误，请稍后再试！'; break;
 }
 return error_msg;
}
function handleData(res) {
 if (res.data.success) {
  if (typeof (res.data.body) === 'string') {
   return [];
  } else if (Array.isArray(res.data.body) === false) {
   const _arr = [];
   _arr.push(res.data.body);
   return _arr;
  } else {
   return res.data.body;
  }
 } else {
  if (res.data.error_no) {
   return {
    error_no: res.data.error_no,
    error_msg: getErrorMsgByErrorNo(res.data.error_no)
   };
  } else {
   return {
    error_no: 123456,
    error_msg: '服务器维护中，请稍后!'
   };
  }
 }
}
const httpClient = {
 request: function (method, url, data) {
  return new Promise((resolve, reject) => {
   wx.request({
    url: url,
    data: data,
    method: method,
    success: function (res) {
     resolve(handleData(res))
    },
    fail: function (err) {
     console.log('request fail ', err);
     resolve({
      error_no: 100,
      error_msg: getErrorMsgByErrorNo(100)
     })
    },
    complete: function (res) {
     console.log("request completed!");
    }
   })
  });
 },
 get: function (url) {
  return this.request('GET', url);
 },
 post: function (url, data) {
  return this.request('POST', url, data);
 },
 put: function (url, data) {
  return this.request('PUT', url, data);
 },
 delete: function (url, data) {
  return this.request('DELETE', url, data);
 },
};
module.exports = httpClient;

function getMyselfData() {
 const _Url= urls.url;
 return httpClient.get(_Url);
}
 getData() {
  let resultsData = this.getMyselfData();
  resultsData.then((res) => {
   if (res.error_no) {
   // 只要有error_no就说明请求出现了错误
    this.toast.showToast({
     type: 'fail',
     title: res.error_msg,
    })
   } else {
    this.setData({
     journeyList: res.data
    })
   }
  });
 },