es6中promise 使用总结

function getData(url){
        var pro = new Promise(function(resolve,reject){
            var xhr = null;
            try{
                xhr = new XMLHttpRequest()
            }
            catch(e){
                xhr = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xhr.open("get",url);
            xhr.onreadystatechange=function (){
                if(xhr.readyState===4){
                    if(xhr.status===200){
                        resolve(xhr.response);
                    }else{
                        reject(new Error(xhr.status));
                    }
                }
            }
            xhr.send()
        })
        return pro;
    }
    getData("xxxx.url").then(function(data){
        console.log(data);
    },function(error){
        console.log(error);
    })

Promise.all([
  getApplicationManage(params),
     msgListConfig(),
     emailListConfig(),
     wechatListConfig(),
     getModuleManage(params)
  ]).then(function(values) {
      _this.applicationData = values[0].model;
      _this.msgConfigOptions = values[1].model;
      _this.emailConfigOptions = values[2].model;
      _this.wechatConfigOptions = values[3].model;
      let resData = values[4].model;
  }).catch(error => {
       console.log(‘error‘);
  }).finally(() => {
       this.loading = false;
       console.log(‘finally‘);
 });