App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head> 
<body>
<p>在用户按下 "A" 键时弹出提示信息。</p>
<input type="text" size="40" onkeydown="myFunction(event)">
<p><strong>注意：</strong> 目前只有 Firefox ，IE9及以上版本支持  key 属性。</p>
<script>
function myFunction(event) {
    var x = event.key;
    // 按下 "a" 或 "A" 键 (使用 caps lock 或 shift)，弹出提示信息    
    if (x == "a" || x == "A") { 
         alert ("你按下了 \'A\' 键!");
    }
}
</script>
</body>
</html>
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