請輸入價格：
<input type="text" id="txtProPrice" />
<input type="button" value="驗證輸入" id="btnTest" />

<script src="jquery.js">
</script>
<script type="text/javascript" language="javascript">
    function ckProPrice() {
        //判斷商品價格
        var reg = /(^[-+]?[1-9]/d*(/./d{1,2})?$)|(^[-+]?[0]{1}(/./d{1,2})?$)/;
        if ($("#txtProPrice").val() == "") {
            alert("商品價格不能為空！");
            return false;
        } else {
            if (!reg.test($("#txtProPrice").val())) {
                alert("市場價格必須為合法數字(正數，最多兩位小數)！");
                return false;
            } else {
                alert("輸入合法！yige.org");
                return true;
            }
        }
    }
    $(function() {
        $("#btnTest").click(function() {
            ckProPrice();
        });
    });
</script>