菜鸟学习javascript实例教程(3)
2008-02-23 07:41:41来源：互联网 阅读 ()
</body>
</html>
检测子字符串是否存在的例子：
<html>
<body>
<script type="text/javascript">
var str = "W3Schools is great!"
document.write(str.match("great"))
</script>
<p>This example tests if a string contains a specified word. If the word is found it returns the word.</p>
</body>
</html>
取子字符串的例子：
<html>
<body>
<script type="text/javascript">
var str="W3Schools is great!"
document.write(str.substr(2,6))
document.write("<br /><br />")
document.write(str.substring(2,6))
</script>
<p>
The substr() method returns a specified part of a string. If you specify (2,6) the returned string will be from the second character (start at 0) and 6 long.
</p>
<p>
The substring() method also returns a specified part of a string. If you specify (2,6) it returns all characters from the second character (start at 0) and up to, but not including, the sixth character.
</p>
</body>
</html>
转换字符串的大小写
<html>
<body>
<script type="text/javascript">
var str=("Hello JavaScripters!")
document.write(str.toLowerCase())
document.write("<br>")
document.write(str.toUpperCase())
</script>
</body>
</html>
数组对象的实例
数组简单应用的例子：
<html>
<body>
<script type="text/javascript">
var famname = new Array(6)
famname[0] = "Jan Egil"
famname[1] = "Tove"
famname[2] = "Hege"
famname[3] = "Stale"
famname[4] = "Kai Jim"
famname[5] = "Borge"
for (i=0; i<6; i )
{
document.write(famname[i] "<br>")
}
</script>
</body>
</html>
另一种使用数组的方法：
<html>
<body>
<script type="text/javascript">
var famname = new Array("Jan Egil","Tove","Hege","Stale","Kai Jim","Borge")
for (i=0; i<famname.length; i )
{
document.write(famname[i] "<br>")
}
</script>
</body>
</html>
使用数组的一些属性和方法：
<html>
<body>
<script type="text/javascript">
var famname = new Array(3)
famname[0] = "Jani"
famname[1] = "Tove"
famname[2] = "Hege"
document.write(famname.length "<br>")
document.write(famname.join(".") "<br>")
document.write(famname.reverse() "<br>")
document.write(famname.push("Ola","Jon") "<br>")
document.write(famname.pop() "<br>")
document.write(famname.shift() "<br>")
</script>
</body>
</html>
数组的两个方法concat和slice
<html>
<body>
<script type="text/javascript">
var famname = new Array(3)
famname[0] = "Jani"
famname[1] = "Tove"
famname[2] = "Hege"
var famname2 = new Array(3)
famname2[0] = "John"
famname2[1] = "Andy"
famname2[2] = "Wendy"
var famname3 = new Array("Stale","Borge")
document.write(famname.join() "<br>")
document.write(famname.concat(famname2) "<br>")
document.write(famname.concat(famname2,famname3) "<br>")
document.write(famname.slice(1) "<br>")
</script>
</body>
</html>
日期相关例子：
显示今天的日期：
<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write(d.getDate())
document.write(".")
document.write(d.getMonth() 1)
document.write(".")
document.write(d.getFullYear())
</script>
</body>
</html>
显示当前的时间：
<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write(d.getHours())
document.write(".")
document.write(d.getMinutes())
document.write(".")
document.write(d.getSeconds())
</script>
</body>
</html>
设置日期：
<html>
<body>
<script type="text/javascript">
var d = new Date()
d.setFullYear("1990")
document.write(d)
</script>
</body>
</html>
UTC时间：
<html>
<body>
<script type="text/javascript">
var d = new Date()
document.write(d.getUTCHours())
document.write(".")
document.write(d.getUTCMinutes())
document.write(".")
document.write(d.getUTCSeconds())
</script>
</body>
</html>
显示当前的星期：
<html>
<body>
<script type="text/javascript">
var d=new Date()
var weekday=new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday")
document.write("Today is " weekday[d.getDay()])
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