class Person {    async getVersion () {        return new Promise((resolve, reject) => {           setTimeout(function () {                resolve('1.0'); // reject('fail')           }, 1000);        })    }}const start = async () => {   var p = new Person();   const data = await p.getVersion();   console.log(20180716090040, data); }start(); // 20180716090040 "1.0"