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JavaScript 获取时间,时间戳

2016-07-30 06:25 330 查看
一. 动态获取js时间

1.方法一:最简单的写法,直接输出时间到页面

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv=Content-Type content=text/html;charset="utf-8">
<script type="text/javascript">
function getNowTime() {
var now = new Date();
var date = now.getFullYear() + "-" + (now.getMonth() + 1) + "-" + now.getDate(); // 年月日
var time = now.getHours() + ":" + now.getMinutes() + ":" + now.getSeconds(); // 时分秒
var day = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六")[now.getDay()]; // 星期
document.getElementById("clock").innerHTML = date+" "+time+" "+day;
}
window.setInterval("getNowTime()", 1000);
</script>
</head>
<body leftmargin="0" topmargin="0" onload="getNowTime()">
<div id="clock"></div>
</body>
</html>


2、方法二:引用外部js实现多种格式时间

1、Clock.js 代码

function Clock() {

var date = new Date();
this.year = date.getFullYear();
this.month = (date.getMonth() + 1) < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
this.date = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
this.day = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六")[date.getDay()];
this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();

this.toString = function() {
return this.year + "年" + this.month + "月" + this.date + "日 " + this.hour + ":" + this.minute + ":" + this.second + " " + this.day;
};

this.toSimpleDate = function() {
return this.year + "-" + this.month + "-" + this.date;
};

this.toDetailDate = function() {
return this.year + "-" + this.month + "-" + this.date + " " + this.hour + ":" + this.minute + ":" + this.second;
};

this.display = function(ele) {

var clock = new Clock();
ele.innerHTML = clock.toString();
window.setTimeout(function() {clock.display(ele);}, 1000);
};
}


  2、HTMl 引用代码

注意:10~13 行代码,要放在HTML的最后,否则不会执行!

<html>
    <head>
        <title></title>
        <meta http-equiv=Content-Type content=text/html;charset=utf-8>
        <script IPT src="js/Clock.js" type=text/javascript></script>
    </head>
    <body leftmargin="0" topmargin="0">
        <div id="clock"></div>
    </body>
    <SCRIPT type=text/javascript>
        var clock = new Clock();
        clock.display(document.getElementById("clock"));
    </SCRIPT>
</html>


 

二. JS 获取当前的时间戳

获取当前时间的时间戳,有三种方法
第一种方法:
var timestamp = Date.parse(new Date());
结果:1280977330000

第二种方法:
var timestamp = (new Date()).valueOf();
结果:1280977330748

第三种方法:
var timestamp = new Date().getTime();
结果:1280977330748

第一种方法获取的时间戳是把毫秒改成000显示,后两种方法获取了当前毫秒的时间戳。

获取指定时间的时间戳

function getTime(day){

re = /(\d{4})(?:-(\d{1,2})(?:-(\d{1,2}))?)?(?:\s+(\d{1,2}):(\d{1,2}):(\d{1,2}))?/.exec(day);
return new Date(re[1],(re[2]||1)-1,re[3]||1,re[4]||0,re[5]||0,re[6]||0).getTime();
}

alert(getTime("2013-02-03 10:10:10"));
alert(getTime("2013-02-03"));
alert(getTime("2013-02"));
alert(getTime("2013"));


 
 
 
 
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