tryjsref_event_key_charcode3 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教程(w3cschool.cn)</title>
</head> 
<body>
<p>在输入框中按下 "O" 键，会弹出提示信息。</p>
<input type="text" size="40" onkeypress="myFunction(event)">
<p id="demo"></p>
<script>
function myFunction(event) {
    var x = event.charCode || event.keyCode;
    if (x == 111 || x == 79) {  // o 是 111, O 是 79
        alert("你按下的是 \'O\' 键!");
    }
}
</script>
</body>
</html>
 
 
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运行结果
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