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<html>
<head>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
<title>js 只能輸入數字和小數點</title>
<script language="JavaScript" type="text/javascript">
function clearNoNum(obj)
{
//先把非數位都替換掉，除了數字和.
obj.value = obj.value.replace(/[^/d.]/g,"");
//必須保證第一個為數字而不是.
obj.value = obj.value.replace(/^/./g,"");
//保證只有出現一個.而沒有多個.
obj.value = obj.value.replace(//.{2,}/g,".");
//保證.只出現一次，而不能出現兩次以上
obj.value = obj.value.replace(".","$#$").replace(//./g,"").replace("$#$",".");
}
</script>
</head>
<body>
<!--把下面代碼加到<body>與</body>之間-->
只能輸入數字和小數點的文字框：<input id="input1" onkeyup="clearNoNum(this)">
</body>
</html>
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