JavaScript中Date对象的常用方法示例
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2022-07-01 14:11:00
getfullyear()
使用 getfullyear() 获取年份。
源代码:
getfullyear()
使用 getfullyear() 获取年份。
源代码:
</script>
<!doctype html>
<html>
<body>
<p id="demo">click the button to display the full year of todays date.</p>
<button onclick="myfunction()">try it</button>
<script>
function myfunction()
{
var d = new date();
var x = document.getelementbyid("demo");
x.innerhtml=d.getfullyear();
}
</script>
</body>
</html>
测试结果:
2015
gettime()
gettime() 返回从 1970 年 1 月 1 日至今的毫秒数。
源代码:
<!doctype html>
<html>
<body>
<p id="demo">click the button to display the number of milliseconds since midnight, january 1, 1970.</p>
<button onclick="myfunction()">try it</button>
<script>
function myfunction()
{
var d = new date();
var x = document.getelementbyid("demo");
x.innerhtml=d.gettime();
}
</script>
</body>
</html>
测试结果:
1445669203860
setfullyear()
如何使用 setfullyear() 设置具体的日期。
源代码:
<!doctype html>
<html>
<body>
<p id="demo">click the button to display a date after changing the year, month, and day.</p>
<button onclick="myfunction()">try it</button>
<script>
function myfunction()
{
var d = new date();
d.setfullyear(2020,10,3);
var x = document.getelementbyid("demo");
x.innerhtml=d;
}
</script>
<p>remember that javascript counts months from 0 to 11.
month 10 is november.</p>
</body>
</html>
测试结果:
tue nov 03 2020 14:47:46 gmt+0800 (中国标准时间)
toutcstring()
如何使用 toutcstring() 将当日的日期（根据 utc）转换为字符串。
源代码:
<!doctype html>
<html>
<body>
<p id="demo">click the button to display the utc date and time as a string.</p>
<button onclick="myfunction()">try it</button>
<script>
function myfunction()
{
var d = new date();
var x = document.getelementbyid("demo");
x.innerhtml=d.toutcstring();
}
</script>
</body>
</html>
测试结果:
sat, 24 oct 2015 06:49:05 gmt
getday()
如何使用 getday() 和数组来显示星期，而不仅仅是数字。
源代码:
<!doctype html>
<html>
<body>
<p id="demo">click the button to display todays day of the week.</p>
<button onclick="myfunction()">try it</button>
<script>
function myfunction()
{
var d = new date();
var weekday=new array(7);
weekday[0]="sunday";
weekday[1]="monday";
weekday[2]="tuesday";
weekday[3]="wednesday";
weekday[4]="thursday";
weekday[5]="friday";
weekday[6]="saturday";
var x = document.getelementbyid("demo");
x.innerhtml=weekday[d.getday()];
}
</script>
</body>
</html>
测试结果:
saturday
display a clock
如何在网页上显示一个钟表。
源代码:
<!doctype html>
<html>
<head>
<script>
function starttime()
{
var today=new date();
var h=today.gethours();
var m=today.getminutes();
var s=today.getseconds();
// add a zero in front of numbers<10
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>