JavaScript学习与实践（20）

js中 Date对象

这个对象主要是用于操作日期和时间的

例子：用Date()得到当前的日期

<html>
<body>
<script type="text/javascript">
document.write(Date())
</script>
</body>
</html>

下面一个getTime()

用他来计算从１９７0年一共过了多少年

<html>
<body>
<script type="text/javascript">
var minutes = 1000*60
var hours = minutes*60
var days = hours*24
var years = days*365
var d = new Date()
var t = d.getTime()
var y = t/years
document.write("It's been: " + y + " years since 1970/01/01!")
</script>
</body>
</html>

下面一个是setFullYear()，用他来设置一个特殊的日期

<html>
<body>
<script type="text/javascript">
var d = new Date()
d.setFullYear(1992,10,3)
document.write(d)
</script>
</body>
</html>

下面是一个toUTCString()，他用于把日期转换成ＵＴＣ格式

<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write (d.toUTCString())
</script>
</body>
</html>

下面是一个getDay()用这个和一个数组来返回一个星期，不仅仅是一个数字哦，

<html>
<body>
<script type="text/javascript">
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"
document.write("Today it is " + weekday[d.getDay()])
</script>
</body>
</html>

怎么在一个页面上展现一个时钟呢，下面的代码可以帮助我们

<html>
<head>
<script type="text/javascript">
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('startTime()',500)
}
function checkTime(i)
{
if (i<10)
{i="0" + i}
return i
}
</script>
</head>

Date Object Methods

FF: Firefox, N: Netscape, IE: Internet Explorer

Method	Description	FF	N	IE
Date()	Returns today's date and time	1	2	3
getDate()	Returns the day of the month from a Date object (from 1-31)	1	2	3
getDay()	Returns the day of the week from a Date object (from 0-6)	1	2	3
getMonth()	Returns the month from a Date object (from 0-11)	1	2	3
getFullYear()	Returns the year, as a four-digit number, from a Date object	1	4	4
getYear()	Returns the year, as a two-digit or a four-digit number, from a Date object. Use getFullYear() instead !!	1	2	3
getHours()	Returns the hour of a Date object (from 0-23)	1	2	3
getMinutes()	Returns the minutes of a Date object (from 0-59)	1	2	3
getSeconds()	Returns the seconds of a Date object (from 0-59)	1	2	3
getMilliseconds()	Returns the milliseconds of a Date object (from 0-999)	1	4	4
getTime()	Returns the number of milliseconds since midnight Jan 1, 1970	1	2	3
getTimezoneOffset()	Returns the difference in minutes between local time and Greenwich Mean Time (GMT)	1	2	3
getUTCDate()	Returns the day of the month from a Date object according to universal time (from 1-31)	1	4	4
getUTCDay()	Returns the day of the week from a Date object according to universal time (from 0-6)	1	4	4
getUTCMonth()	Returns the month from a Date object according to universal time (from 0-11)	1	4	4
getUTCFullYear()	Returns the four-digit year from a Date object according to universal time	1	4	4
getUTCHours()	Returns the hour of a Date object according to universal time (from 0-23)	1	4	4
getUTCMinutes()	Returns the minutes of a Date object according to universal time (from 0-59)	1	4	4
getUTCSeconds()	Returns the seconds of a Date object according to universal time (from 0-59)	1	4	4
getUTCMilliseconds()	Returns the milliseconds of a Date object according to universal time (from 0-999)	1	4	4
parse()	Takes a date string and returns the number of milliseconds since midnight of January 1, 1970	1	2	3
setDate()	Sets the day of the month in a Date object (from 1-31)	1	2	3
setMonth()	Sets the month in a Date object (from 0-11)	1	2	3
setFullYear()	Sets the year in a Date object (four digits)	1	4	4
setYear()	Sets the year in the Date object (two or four digits). Use setFullYear() instead !!	1	2	3
setHours()	Sets the hour in a Date object (from 0-23)	1	2	3
setMinutes()	Set the minutes in a Date object (from 0-59)	1	2	3
setSeconds()	Sets the seconds in a Date object (from 0-59)	1	2	3
setMilliseconds()	Sets the milliseconds in a Date object (from 0-999)	1	4	4
setTime()	Calculates a date and time by adding or subtracting a specified number of milliseconds to/from midnight January 1, 1970	1	2	3
setUTCDate()	Sets the day of the month in a Date object according to universal time (from 1-31)	1	4	4
setUTCMonth()	Sets the month in a Date object according to universal time (from 0-11)	1	4	4
setUTCFullYear()	Sets the year in a Date object according to universal time (four digits)	1	4	4
setUTCHours()	Sets the hour in a Date object according to universal time (from 0-23)	1	4	4
setUTCMinutes()	Set the minutes in a Date object according to universal time (from 0-59)	1	4	4
setUTCSeconds()	Set the seconds in a Date object according to universal time (from 0-59)	1	4	4
setUTCMilliseconds()	Sets the milliseconds in a Date object according to universal time (from 0-999)	1	4	4
toSource()	Represents the source code of an object	1	4	-
toString()	Converts a Date object to a string	1	2	4
toGMTString()	Converts a Date object, according to Greenwich time, to a string. Use toUTCString() instead !!	1	2	3
toUTCString()	Converts a Date object, according to universal time, to a string	1	4	4
toLocaleString()	Converts a Date object, according to local time, to a string	1	2	3
UTC()	Takes a date and returns the number of milliseconds since midnight of January 1, 1970 according to universal time	1	2	3
valueOf()	Returns the primitive value of a Date object	1	2	4

Date Object Properties

Property	Description	FF	N	IE
constructor	A reference to the function that created the object	1	4	4
prototype	Allows you to add properties and methods to the object	1	3	4

posted @ 2007-01-31 10:40 lxsohu 阅读(468) 评论(4) 收藏举报

刷新页面返回顶部