//方法一

var timestamp = (new Date()).getTime();

console.log(timestamp); //1495302061441

//方法二

var timestamp2 = (new Date()).valueOf();

console.log(timestamp2); //1495302061447

//方法三

var timestamp3 = Date.parse(new Date());

console.log(timestamp3);//1495302061000

第一种和第二种是获取了当前毫秒的时间戳

最后一种获取的时间戳是把毫秒改成000显示