async generator promise异步方案实际运用

es7 async方案

/******************async***********************/
var timeFn=function(time){
    return new Promise(function(resolve,reject){
        setTimeout(function(){
            console.log(2)
            resolve(3);
        },time)
    })  
}


var asyncFn=async function (){
    console.log(1)
    var parm=await timeFn(5000);
    console.log(parm)
    console.log(4)
}
asyncFn()
/******************async********