tryjs_intro_alert 在线代码实例

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<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>W3Cschool教程(w3cschool.cn)</title> 
</head>
<body>
    
<h1>我的第一个 JavaScript</h1>
<p>
JavaScript 能够对事件作出反应。比如对按钮的点击：
</p>
<button type="button" onclick="alert('欢迎!')">点我!</button>
    
</body>
</html>
 
 
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运行结果
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