ES6 Async 化异步为同步

function testAwait(){
    return new Promise((resolve,rej) => {
        setTimeout(function(){
            resolve("aaa");
        }, 1000);
    });
}//用定时器模拟异步函数

async function helloAsync(){
    let data=await testAwait().then(function (data) {
        return new Promise((resolve,reject)=>{
            resolve(data+"bbbbb");
            //reject(data+"bbbbb");
        })
    }).catch(function (data) {
        console.log(data);
    });
    console.log(data);
    console.log("helloAsync");
}
helloAsync();

输出

aaabbbbb
helloAsync