javascript代碼片斷

<script language="JavaScript" type="text/javascript">
function clearNoNum(obj){
obj.value = obj.value.replace(/[^\d.]/g,""); //清除"數字"和"."之外的字符
obj.value = obj.value.replace(/^\./g,""); //驗證第一個字符是數字而不是
obj.value = obj.value.replace(/\.{2,}/g,"."); //只保留第一個. 清除多餘的
obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3'); //只能輸入兩個小數
}
</script>

<input type="text" name="addoil" onkeyup="clearNoNum(this)" size="10"/>