第一种：
//时间类比较 startTime= new Date(Date.parse(starttime)); endTime=new Date(Date.parse(endTime)); //进行比较 startTime>endTime
//时间戳比较 startTime=Date.parse(starttime); endTime=Date.parse(endTime); //进行比较 startTime>endTime
var date= new Date(); var time1 = date.getTime(); var time2 = date.valueOf(); var time3 = Date.parse(Date()); console.log(time1);//1528258266412 console.log(time2);//1528258366197 console.log(time3);//1528257868000
原文：https://www.cnblogs.com/aSnow/p/9144473.html