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a string contains a specified word. If the word is found it returns the position of the first character of the word in the original string. Note: The first position in the string is 0!</p>
</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()])
</script>
</body>
</html>
显示当前的日期和星期：
<html>
<body>
<script type="text/javascript">
var d=new Date()
var weekday=new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday")
var monthname=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
document.write(weekday[d.getDay()] + " ")
document.write(d.getDate() + ". ")
document.write(monthname[d.getMonth()] + " ")
document.write(d.getFullYear())
</script>
</body>
</html>
一个走动的时间：
<html>
<head>
<script type="text/javascript">
var timer = null
function stop()
{
clearTimeout(timer)
}
function start()
{
var time = new Date()
var hours = time.getHours()
var minutes = time.getMinutes()
minutes=((minutes < 10) ? "0" : "") + minutes
var seconds = time.getSeconds()
seconds=((seconds < 10) ? "0" : "") + seconds
var clock = hours + ":" + minutes + ":" + seconds
document.forms[0].display.value = clock
timer = setTimeout("start()",1000)
}
</script>
</head>
<body onload="start()" onunload="stop()">
<form>
<input type="text" name="display" size="20">
</form>
</body>
</html>
数学对象的例子：
<html>
<body>
<script type="text/javascript">
document.write(Math.round(7.25))
</script>
</body>
</html>
产生0-1之间的随机数的例子
<html>
<body>
<script type="text/javascript">
document.write(Math.random())
</script>
</body>
</html>
产生0-10的随机数的例子
<html>
<body>
<script type="text/javascript">
no=Math.random()*10
document.write(Math.round(no))
</script>
</body>
</html>
求最大数的例子：
<html>
<body>
<script type="text/javascript">
document.write(Math.max(2,4))
</script>
</body>
</html>
求最小数的例子：
<html>
<body>
<script type="text/javascript">
document.write(Math.min(2,4))
</script>
</body>
</html>
Convert Celsius to Fahrenheit
<html>
<head>
<script type="text/javascript">
function convert(degree)
{
if (degree=="C")
{
F=document.myform.celsius.value * 9 / 5 + 32
document.myform.fahrenheit.value=Math.round(F)
}
else
{
C=(document.myform.fahrenheit.value -32) * 5 / 9
document.myform.celsius.value=Math.round(C)
}
}
</script>
</head>
<body>
<b>Insert a number in either input field, and the number will be converted into
either Celsius or Fahrenheit.</b>
<br />
<form name="myform">
<input name="celsius" onkeyup="convert('C')"> degrees Celsius<br />
equals<br />
<input name="fahrenheit" onkeyup="convert('F')"> degrees Fahrenheit
</form>
<br />
Note that the <b>Math.round</b> method is used,
so that the result will be returned as a whole number.
</body>
</html>
转变字符为数字的例子
<html>
<head>
<script type="text/javascript">
function toUnicode()
{
var str=document.myForm.myInput.value
if (str!="")
{
unicode=str.charCodeAt(0)
}
document.myForm.unicode.value=unicode
}
</script>
</head>
<body>
<form name="myForm">
Write a character:<br />
<input size="1" name="myInput" maxlength="1" onkeyup="toUnicode()">
<hr />
The character's Unicode:<br />
<input size="3" name="unicode">
</form>
</html>
超级连接对象
用按钮来改变连接位置的例子：
<html>
<head>
<script type="text/javascript">
function myHref()
{
document.getElementById('myAnchor').innerText="Visit W3Schools"
document.getElementById('myAnchor').href="http://www.w3schools.com"
}
</script>
</head>
<body>
<a id="myAnchor" href="Visit'>http://www.microsoft.com">Visit Microsoft</a>
<form>
<input type="button" onclick="myHref()" value="Change URL and text">
</form>
</body>
</html>
改变连接的打开方式的例子：
<html>
<head>
<script type="text/javascript">
function myTarget()
{
document.getElementById('myAnchor').target="_blank"
}
</script>
</head>
<body>
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