获取时间戳的方法
var timestamp = Date.parse(new Date());
var timestamp = (new Date()).valueOf();
var timestamp=new Date().getTime();
时间戳的计算、比较大小
//将时间格式转化为时间戳
var oDate1 = new Date(2015,8,1,0,0,0);
var oDate2 = new Date(2015,10,1,0,0,0);
//时间差 单位毫秒
var nTime = oDate2.getTime() - oDate1.getTime();
//天
var day=nTime/1000/60/60/24;
//小时
var hour=nTime/1000/60/60;
// 分钟
var min=nTime/1000/60;
// 秒
var second=nTime/1000;
//时间戳直接计算
var newtimestamp = new Date().valueOf();
var oldtimestamp = new Date().getTime(); //取更早的时间
var nTime=(oldtimestamp-newtimestamp)/1000; //秒时间差
