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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title> 
<script>
function displayDate(){
    document.getElementById("demo").innerHTML=Date();
}
</script>
</head>
<body>
<h1>我的第一个 JavaScript 程序</h1>
<p id="demo">这是一个段落</p>
<button type="button" onclick="displayDate()">显示日期</button>
</body>
</html>
 
 
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運(yùn)行結(jié)果

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<!DOCTYPE html> <html> <head> <meta charset=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"utf-8\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"> <title>W3Cschool教程(w3cschool.cn)</title> </head> <body> <h1>我的第一個(gè) JavaScript 程序</h1> <p id=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"demo\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\">這是一個(gè)段落</p> <button type=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"button\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" onclick=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"displayDate()\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\">顯示日期</button> </body> </html>