时间
let now =new Date();
console.log(now.getTime());//得到时间戳:1552372055037
console.log(now);//得到时间:2019-03-12T06:26:45.281Z
时间
let now =new Date();
console.log(now.getTime());//得到时间戳:1552372055037
console.log(now);//得到时间:2019-03-12T06:26:45.281Z