JavaScript201708/WEEK5/DAY4/2-eventKey.html at master · code-brewer/JavaScript201708 · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>珠峰培训</title>
    <link rel="stylesheet" href="css/reset.min.css">
    <style>
        html, body {
            width: 100%;
            height: 1000%;
            background: -webkit-linear-gradient(top left, lightblue, lightcoral);
        }
    </style>
</head>
<body>
<script>
    //=>禁止F5刷新(默认行为)
    document.onkeydown = document.onkeypress = document.onkeyup = function (e) {
        e = e || window.event;
        var keyNum = e.which || e.keyCode;
        if (keyNum === 116) {
            //->F5
            e.keyCode = 0;//->IE下还需要把KEY-CODE设置为零才管用
            e.preventDefault ? e.preventDefault() : e.returnValue = false;
        }
    }
</script>
</body>
</html>