JavaScript ?? ??
? ???? JavaScript Date ??? ?????.
?? ??? ??? ??? ???? ? ?????.
JavaScript ??(??) ?? ????
Date() ???? ???? ?? ??? ???? ??:
<html> <meta charset="utf-8"> <body> <script type="text/javascript"> document.write(Date()) </script> </body> </html>
getTime() 1990? 1? 1??? ????? ??? ?? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p id="demo">單擊按鈕顯示1970年1月1號至今的毫秒數(shù)。</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.getTime();
}
</script>
</body>
</html>?? ?? ??? ???? ?? setFullYear()? ???? ??:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p id="demo">單擊按鈕顯示修改后的年月日。</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var d = new Date();
d.setFullYear(2020,10,3);
var x = document.getElementById("demo");
x.innerHTML=d;
}
</script>
<p>記住JavaScript月數(shù)是從0至11。10是11月。</p>
</body>
</html>?? ??(UTC? ??)? ???? ???? ?? toUTCString()? ???? ??:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p id="demo">點擊按鈕把utc日期和時間轉換成字符串。</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.toUTCString();
}
</script>
</body>
</html>??? ?? getDay()? ???? ??? ???? ?? ??? ?? ?:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p id="demo">單擊按鈕顯示今天周幾</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var d = new Date();
var weekday=new Array(7);
weekday[0]="周日";
weekday[1]="周一";
weekday[2]="周二";
weekday[3]="周三";
weekday[4]="周四";
weekday[5]="周五";
weekday[6]="周六";
var x = document.getElementById("demo");
x.innerHTML=weekday[d.getDay()];
}
</script>
</body>
</html>? ???? ??? ???? ??:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<script>
function startTime(){
var today=new Date();
var h=today.getHours();
var m=today.getMinutes();
var s=today.getSeconds();// 在小于10的數(shù)字錢前加一個‘0’
m=checkTime(m);
s=checkTime(s);
document.getElementById('txt').innerHTML=h+":"+m+":"+s;
t=setTimeout(function(){startTime()},500);
}
function checkTime(i){
if (i<10){
i="0" + i;
}
return i;
}
</script>
</head>
<body onload="startTime()">
<div id="txt"></div>
</body>
</html>Creation Date
Date ??? ??? ??? ???? ? ?????.
?? ??? new ???? ?? ??? ? ????. ?? ??? myDate?? Date ??? ?????.
??? ????? ? ?? ??? ????.
new Date() // ?? ?? ? ??
new Date(milliseconds) // 1970? 1? 1?? ??? ?????. ???? ???
new Date(dateString)
new Date(?, ?, ?, ?, ?, ?, ???)
? ????? ???? ???? ?? ?? ???????.
<pFrom 1970="" year="" 1="" Month="" ??? 86,400,000???? ?????<="" p="" style="color: rgb(51, 51, 51 ); ?? ??: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, STHeiti, 'Microsoft Yahei', sans-serif; ? ??: ??; : rgb(255, 255, 255);">
?? ?????? ? ?? ?:
var today = new Date()
var d1 = new Date("1975? 10? 13? 11:13: 00")
var d2 = new Date(79,5,24)
var d3 = new Date(79,5,24,11,33,0)
?? ??
date ??? ???? ???? Dates? ?????. ?? ??? ? ????.
?? ???? ?? ??? ?? ?? ??(2010? 1? 14?)? ?????.
var myDate=new Date();
myDate.setFullYear(2010,0,14);
???? ????? ?? ??? 5? ?? ??? ??????.
var myDate=new Date();
myDate.setDate(myDate.getDate()+5);
??: ? ?? ??? ? ?? ??? ???? ?? ??? ???? ? ??? ?????.
? ?? ??
Date ??? ???? ? ??? ??? ?? ????.
?? ??? ?? ??? 2100? 1? 14?? ?????.
var x=new Date();
x.setFullYear(2100,0,14);
var today = new Date();
if (x>today)
{
Alert("??? 2100? 1? ?????. 14?");
}
else
{
Alert("??? 2100? 1? 14? ?????.");
}
