App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool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="keyCode(event)"> 
<script>
function keyCode(event) {
    var x = event.keyCode;
    if (x == 27) {
        alert ("你按下了 Esc 键!");
    }
}
</script>
</body>
</html>
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