菜鸟学习javascript实例教程(12)
2008-02-23 07:41:41来源：互联网 阅读 ()
最详细的浏览器的信息
<html>
<body>
<script type="text/javascript">
var x = navigator
document.write("CodeName=" x.appCodeName)
document.write("<br />")
document.write("MinorVersion=" x.appMinorVersion)
document.write("<br />")
document.write("Name=" x.appName)
document.write("<br />")
document.write("Version=" x.appVersion)
document.write("<br />")
document.write("CookieEnabled=" x.cookieEnabled)
document.write("<br />")
document.write("CPUClass=" x.cpuClass)
document.write("<br />")
document.write("OnLine=" x.onLine)
document.write("<br />")
document.write("Platform=" x.platform)
document.write("<br />")
document.write("UA=" x.userAgent)
document.write("<br />")
document.write("BrowserLanguage=" x.browserLanguage)
document.write("<br />")
document.write("SystemLanguage=" x.systemLanguage)
document.write("<br />")
document.write("UserLanguage=" x.userLanguage)
</script>
</body>
</html>
按浏览器不同实现导航
<html>
<head>
<script type="text/javascript">
function redirectme()
{
bname=navigator.appName
if (bname.indexOf("Netscape")!=-1)
{
window.location="tryjs_netscape.htm"
return
}
if (bname.indexOf("Microsoft")!=-1)
{
window.location="tryjs_microsoft.htm"
return
}
window.location="tryjs_other.htm"
}
</script>
</head>
<body onload="redirectme()">
</body>
</html>
检测浏览器的版本
<html>
<head>
<script type="text/javascript">
function browserversion()
{
txt="Your browser is unknown"
browser=navigator.appVersion
if (browser.indexOf("2.")>-1)
{
txt="Your browser is from the stone-age!"
}
if (browser.indexOf("3.")>-1)
{
txt="You should update your browser!"
}
if (browser.indexOf("4.")>-1)
{
txt="Your browser is good enough!"
}
document.getElementById("message").innerHTML=txt
}
</script>
</head>
<body onload="browserversion()">
<span id="message"></span>
</body>
</html>
选择对象
设置下拉列表的可用性
<html>
<head>
<script type="text/javascript">
function makeDisable()
{
var x=document.getElementById("mySelect")
x.disabled=true
}
function makeEnable()
{
var x=document.getElementById("mySelect")
x.disabled=false
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="makeDisable()" value="Disable list">
<input type="button" onclick="makeEnable()" value="Enable list">
</form>
</body>
</html>
返回下拉列表中选择的项的值
<html>
<head>
<script type="text/javascript">
function formAction()
{
var x=document.getElementById("mySelect")
alert(x.length)
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="formAction()" value="How many options in the list?">
</form>
</body>
</html>
改变下拉列表的大小
<html>
<head>
<script type="text/javascript">
function formAction()
{
var x=document.getElementById("mySelect")
x.size="3"
}
</script>
</head>
<body>
<form>
<select name="mySelect">
<option>Apple</option>
<option>Banana</option>
<option>Orange</option>
<option>Melon</option>
</select>
<input type="button" onclick="formAction()" value="Change size of list">
</form>
</body>
</html>
列表可选择多项
<html>
<head>
<script type="text/javascript">
function formAction()
{
var x=document.getElementById("mySelect")
x.multiple=true
}
</script>
</head>
<body>
<p>
Before you click on the "Select multiple" button, try to select more than one option (by holding down the shift or Ctrl key). Click on the "Select multiple" button and try again.
</p>
<form>
<select name="mySelect" size="3">
<option>Apple</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="formAction()" value="Select multiple">
</form>
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