Javascript运行时错误：

Question

我将调用以下JS来验证英国邮政编码：

<script type="text/javascript">

    function jsre(theField) {
        var chk_postalcode = "^[A-Z0-9 ]*[A-Z][A-Z0-9 ]*\d[A-Z0-9 ]*$|^[A-Z0-9 ]*\d[A-Z0-9 ]*[A-Z][A-Z0-9 ]*$";
        var txtpostalcode = document.getElementById("txtPostCode");

        if (!chk_postalcode.test(txtpostalcode.value)) {
            alert("Valid");
        } else {
            alert("Invalid");
        }
    }
</script>

<asp:TextBox ID="txtPostCode" runat="server" onchange="jsre(this);"></asp:TextBox>

我得到的运行时错误如下：

Error: Object doesn't support property or method 'test'

我在http://www.9lessons.info/2009/03/perfect-javascript-form-validation.html的帮助下构建了我的代码。

有人能帮我吗?我怎样才能让代码正常工作？

Answer 1

"^[A-Z0-9 ][A-Z][A-Z0-9 ]\d[A-Z0-9 ]$|^[A-Z0-9 ]\d[A-Z0-9 ][A-Z][A-Z0-9 ]$"将其更改为/^[A-Z0-9 ][A-Z][A-Z0-9 ]\d[A-Z0-9 ]$|^[A-Z0-9 ]\d[A-Z0-9 ][A-Z][A-Z0-9 ]$/.去掉双引号，放上斜杠。

Answer 2

chk_postalcode仍然是一个string，所以它没有test()方法。

将其转换为RegExp对象：

var chk_postalcode = /^[A-Z0-9 ]*[A-Z][A-Z0-9 ]*\d[A-Z0-9 ]*$|^[A-Z0-9 ]*\d[A-Z0-9 ]*[A-Z][A-Z0-9 ]*$/;

Answer 3

应该是：

//add slashes and remove quotes
var chk_postalcode = /^[A-Z0-9 ]*[A-Z][A-Z0-9 ]*\d[A-Z0-9 ]*$|^[A-Z0-9 ]*\d[A-Z0-9 ]*[A-Z][A-Z0-9 ]*$/;