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註冊的時候需要發送驗證啟用帳號的郵件，為了避免郵件的多次重複發送，所以可以在點擊了發送後，設定button要過一段時間才能繼續點擊。下面是一個簡單的例子：
複製代碼 代碼如下:
<html>
<head>
<title>點擊擷取驗證碼按鈕後按鈕變灰，倒計時一段時間後又可重複點擊</title>
</head>
<body>
<input type="button" id="btn" value="免費擷取驗證碼" />
<script type="text/javascript">
var wait=60;
function time(o) {
if (wait == 0) {
o.removeAttribute("disabled");
o.value="免費擷取驗證碼";
wait = 60;
} else {
o.setAttribute("disabled", true);
o.value=wait+"秒後可以重新發送";
wait--;
setTimeout(function() {
time(o)
},
1000)
}
}
document.getElementById("btn").onclick=function(){time(this);}
</script>
</body>
</html>
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