创建
var now = new Date();
l(now);//Thu Dec 28 2017 22:09:42 GMT+0800 (中国标准时间)
Date.parse();
var someDate = new Date(Date.parse('May 25, 2004'));
l(someDate);//Tue May 25 2004 00:00:00 GMT+0800 (中国标准时间)
Date.UTC()
var y2k = new Date(Date.UTC(2000,0));
l(y2k);//Sat Jan 01 2000 08:00:00 GMT+0800 (中国标准时间
var allFives = new Date(Date.UTC(2005, 4, 5, 17, 55,55))
l(allFives);
Date.now();
function doSomeThing(){
l(1+1*1000000000000000000000000000);
}
var start = Date.now();
doSomeThing();
var stop = Date.now();
var result = stop - start;
l(start);
l(stop);
l(result)
5.3.1 继承的方法(toLocaleString(), toString(), valueOf())
toLocaleString: 不带时区
toString: 带时区
var date1 = new Date(2007, 0, 1);
var date2 = new Date(2007, 1, 1);
l(date1);
l(date2);
l(date1< date2);//true
5.3.2 日期格式化方法(toDateString(), toTimeString(), toLocaleDateString(), toLocaleTimeString(), toUTCString())
5.3.3 日期组件方法
getMonth
getDay
getFullYear....