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廢話不多說，上代碼：
複製代碼 代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title></title>
<script type="text/javascript">
/**
* 只能輸入數字0-9
*/
function kp(){
if(event.keyCode<=47 || event.keyCode>=65) {
event.returnValue=false;
}
}
/**
* 只能輸入數字0-9和 .（小數點）
*/
function kpd(){
if(event.keyCode<=47 || (event.keyCode>=65 && event.keyCode!=190)) {
event.returnValue=false;
}
}
</script>
</head>
<body>
這個input只能輸入0-9<input type="text" id="t1" onkeydown="kp()"/><br/>
這個input只能輸入0-9.<input type="text" id="t2" onkeydown="kpd()"/>
</body>
</html>
直接在keydown的時候就截掉輸入事件，根本不讓輸。
不用replace那種彆扭的方法 - 輸進了字母再替換掉，好醜！
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