tryjsref_event_key_which3 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
</head> 
<body>
<p>在输入框中按下 Esc 键(左上角)会弹出提示信息。</p>
<input type="text" size="50" onkeydown="myFunction(event)"> 
<script>
function myFunction(event) {
    var x = event.which || event.keyCode;
    if (x == 27) {
        alert ("你按下了 Esc 键!");
    }
}
</script>
</body>
</html>
 
 
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运行结果
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