function asyncFunc(callback) {
 setTimeout(function () {
  //在这里写你的逻辑代码
  //...

  //逻辑代码结束，执行一个回调函数
  callback();
 }, 5000);
}

function getAccountInfo(callback, errorCallback) {
 wx.request({
  url: '/accounts/12345',
  success: function (res) {
   //...
   callback(data);
  },
  fail: function (res) {
   //...
   errorCallback(data);
  }
 });
}

asyncFunc(function () {
 console.log("asyncFunc() run complete");
});

getAccountInfo(function (data) {
 console.log("get account info successfully:", data);
}, function () {
 console.error("get account info failed");
});

asyncFunc1(function(){
 //...
 asyncFunc2(function(){
  //...
  asyncFunc3(function(){
   //...
   asyncFunc4(function(){
    //...
    asyncFunc5(function(){
      //...
    });
   });
  });
 });
});

function asyncFunc1(){
 return new Promise(function (resolve, reject) {
  //...
 })
}

 
// asyncFunc2,3,4,5也实现成跟asyncFunc1一样的方式...

asyncFunc1()
 .then(asyncFunc2)
 .then(asyncFunc3)
 .then(asyncFunc4)
 .then(asyncFunc5);

wx.getLocation({ 
 type: 'wgs84', 
 success: function(res) { 
  var latitude = res.latitude 
  var longitude = res.longitude 
  var speed = res.speed 
  var accuracy = res.accuracy 
 },
 fail: function() {
  console.error("get location failed")
 }
})

var Promise = require('../libs/bluebird.min')  //我用了bluebird.js
function wxPromisify(fn) { 
 return function (obj = {}) {  
  return new Promise((resolve, reject) => {   
   obj.success = function (res) {    
    resolve(res)   
   }   

   obj.fail = function (res) {    
    reject(res)   
   }   

   fn(obj)  
  }) 
 }
}

module.exports = { 
 wxPromisify: wxPromisify
}

var util = require('../utils/util')

var getLocationPromisified = util.wxPromisify(wx.getLocation)

getLocationPromisified({
 type: 'wgs84'
}).then(function (res) {
 var latitude = res.latitude 
 var longitude = res.longitude 
 var speed = res.speed 
 var accuracy = res.accuracy 
}).catch(function () {
 console.error("get location failed")
})