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進階 JavaScript 執行個體

檢測浏覽器及版本

<html>
<body>
<script type="text/javascript">
var browser=navigator.appName
var b_version=navigator.appVersion
var version=parseFloat(b_version)
document.write("浏覽器名稱："+ browser)
document.write("<br />")
document.write("浏覽器版本："+ version)
</script>
</body>
</html>

檢測浏覽器的更多資訊

<html>
<body>
<script type="text/javascript">
document.write("<p>浏覽器：")
document.write(navigator.appName + "</p>")

document.write("<p>浏覽器版本：")
document.write(navigator.appVersion + "</p>")

document.write("<p>代碼：")
document.write(navigator.appCodeName + "</p>")

document.write("<p>平台：")
document.write(navigator.platform + "</p>")

document.write("<p>Cookies 啟用：")
document.write(navigator.cookieEnabled + "</p>")

document.write("<p>浏覽器的使用者代理報頭：")
document.write(navigator.userAgent + "</p>")
</script>
</body>
</html>

檢測浏覽器的全部資訊

<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>

根據浏覽器類型提醒使用者

<html>
<head>
<script type="text/javascript">
function detectBrowser()
{
var browser=navigator.appName
var b_version=navigator.appVersion
var version=parseFloat(b_version)
if ((browser=="Netscape"||browser=="Microsoft Internet Explorer") && (version>=4))
  {alert("您的浏覽器夠先進了！")}
else
  {alert("是時候更新您的浏覽器了！")}
}
</script>
</head>

<body οnlοad="detectBrowser()">
</body>

</html>

建立一個歡迎 cookie

<html>
<head>
<script type="text/javascript">
function getCookie(c_name)
{
if (document.cookie.length>0)
{ 
c_start=document.cookie.indexOf(c_name + "=")
if (c_start!=-1)
{ 
c_start=c_start + c_name.length+1 
c_end=document.cookie.indexOf(";",c_start)
if (c_end==-1) c_end=document.cookie.length
return unescape(document.cookie.substring(c_start,c_end))
} 
}
return ""
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date()
exdate.setDate(exdate.getDate()+expiredays)
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : "; expires="+exdate.toGMTString())
}

function checkCookie()
{
username=getCookie('username')
if (username!=null && username!="")
  {alert('Welcome again '+username+'!')}
else 
  {
  username=prompt('Please enter your name:',"")
  if (username!=null && username!="")
    {
    setCookie('username',username,365)
    }
  }
}
</script>
</head>
<body onLoad="checkCookie()">
</body>
</html>

按鈕動畫

<html>
<head>
<script type="text/javascript">
function mouseOver()
{
document.b1.src ="/i/eg_mouse.jpg"
}
function mouseOut()
{
document.b1.src ="/i/eg_mouse2.jpg"
}
</script>
</head>

<body>
<a href="/index.html" target="_blank" rel="external nofollow"  target="_blank">
<img  alt="Visit W3School!" src="/i/eg_mouse2.jpg" name="b1"  οnmοuseοver="mouseOver()" οnmοuseοut="mouseOut()" /></a>
</body>
</html>

添加了 JavaScript 的圖像映射

<html>
<head>
<script type="text/javascript">
function writeText(txt)
{
document.getElementById("desc").innerHTML=txt
}
</script>
</head>

<body>
<img src="/i/eg_planets.jpg"  usemap="#planetmap" alt="Planets" />

<map name="planetmap" id="planetmap">

<area shape="circle" coords="180,139,14"
onMouseOver="writeText('直到 20 世紀 60 年代，金星一直被認為是地球的孿生姐妹，因為金星是離我們最近的行星，同時還由于兩者擁有很多共同的特征。')"
href ="/example/html/venus.html" target ="_blank" alt="Venus" />

<area shape="circle" coords="129,161,10"
onMouseOver="writeText('從地球上是很難研究水星的，這是由于它和太陽的距離總是很近。')"
href ="/example/html/mercur.html" target ="_blank" alt="Mercury" />

<area shape="rect" coords="0,0,110,260"
onMouseOver="writeText('太陽和類似木星這樣的氣态行星是到目前為止太陽系中最大的物體。')"
href ="/example/html/sun.html" target ="_blank" alt="Sun" />

</map>

<p id="desc"></p>

</body>
</html>

簡單的計時

<html>
<head>
<script type="text/javascript">
function timedMsg()
{
var t=setTimeout("alert('5 秒！')",5000)
}
</script>
</head>

<body>
<form>
<input type="button" value="顯示定時的警告框" onClick = "timedMsg()">
</form>
<p>請點選上面的按鈕。警告框會在 5 秒後顯示。</p>
</body>

</html>

另一個簡單的計時

<html>
<head>
<script type="text/javascript">
function timedText()
{
var t1=setTimeout("document.getElementById('txt').value='2 秒'",2000)
var t2=setTimeout("document.getElementById('txt').value='4 秒'",4000)
var t3=setTimeout("document.getElementById('txt').value='6 秒'",6000)
}
</script>
</head>

<body>

<form>
<input type="button" value="顯示計時的文本" onClick="timedText()">
<input type="text" id="txt">
</form>

<p>點選上面的按鈕。輸入框會顯示出已經逝去的時間（2、4、6 秒）。</p>
</body>

</html>

在一個無窮循環中的計時事件

<html>
<head>
<script type="text/javascript">
var c=0
var t
function timedCount()
{
document.getElementById('txt').value=c
c=c+1
t=setTimeout("timedCount()",1000)
}
</script>
</head>

<body>

<form>
<input type="button" value="開始計時！" onClick="timedCount()">
<input type="text" id="txt">
</form>

<p>請點選上面的按鈕。輸入框會從 0 開始一直進行計時。</p>

</body>

</html>

帶有停止按鈕的無窮循環中的計時事件

<html>
<head>
<script type="text/javascript">
var c=0
var t
function timedCount()
{
document.getElementById('txt').value=c
c=c+1
t=setTimeout("timedCount()",1000)
}

function stopCount()
{
clearTimeout(t)
}
</script>
</head>

<body>

<form>
<input type="button" value="開始計時！" onClick="timedCount()">
<input type="text" id="txt">
<input type="button" value="停止計時！" onClick="stopCount()">
</form>

<p>請點選上面的“開始計時”按鈕來啟動計時器。輸入框會一直進行計時，從 0 開始。點選“停止計時”按鈕可以終止計時。</p>

</body>

</html>

使用計時事件制作的鐘表

<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>

<body οnlοad="startTime()">
<div id="txt"></div>
</body>
</html>

建立對象的執行個體

<html>
<body>

<script type="text/javascript">

personObj=new Object()
personObj.firstname="John"
personObj.lastname="Adams"
personObj.age=35
personObj.eyecolor="black"

document.write(personObj.firstname + " 的年齡是 " + personObj.age + " 歲。")

</script>

</body>
</html>

建立用于對象的模闆

<html>
<body>

<script type="text/javascript">

function person(firstname,lastname,age,eyecolor)
{
this.firstname=firstname
this.lastname=lastname
this.age=age
this.eyecolor=eyecolor
}

myFather=new person("John","Adams",35,"black")

document.write(myFather.firstname + " 的年齡是 " + myFather.age + " 歲。")

</script>

</body>
</html>
javascript 浏覽器 browser button function microsoft
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