tryjsref_event_key_charcode2 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>
<p>在输入框中输入键盘上的字符获取按下字母的 Unicode 字符代码和 Unicode 键代码 。</p>
<input type="text" size="40" onkeypress="myFunction(event)">
<p id="demo"></p>
<script>
function myFunction(event) {
    // 如果浏览器不支持 charCode 使用 event.keyCode ( IE8 及更早版本)
    var x = event.charCode || event.keyCode;
    document.getElementById("demo").innerHTML = " Unicode 值为：" + x;
}
</script>
</body>
</html>
 
 
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运行结果
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