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<head>
<title></title>
<script type="text/javascript">
window.onload = function () {
//计时器
var i = 5;
var setId = setInterval(function () {
i--;
var btnObj = document.getElementById(‘btn‘);
if (i == 0) {
clearInterval(setId);
btnObj.value = ‘同意‘;
btnObj.disabled = false;
} else {
btnObj.value = ‘请仔细阅读协议(‘ + i + ‘)‘;
}
}, 1000);
};
</script>
</head>
<body>
<input type="button" name="name" value="请仔细阅读协议(5)" disabled="disabled" id="btn" />
</body>
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原文地址：http://www.cnblogs.com/bidianqing/p/4690544.html
