javascript - validateLogin 是一个未定义的函数。(javascript 异常)

Question

嗨，我收到错误，因为未定义函数，我认为我的代码是好吧，在这种情况下有人可以帮忙吗？请帮助并建议我通过 ajax 方法通过 Web 服务获取数据的好教程。

<script type="text/javascript" language="javascript" src="Scripts/jquery-1.4.1.js">

  function validatelogin() {

        $('input[type=button]').attr('disabled', true);
        $("#login").html('');
        var loginId = $('#txt_id').attr('value'); // get username
        var password = $('#txt_pwd').attr('value'); // get password

        $.ajax({

            type: "POST",
            url: "WebService.asmx/validateLogin",
            data: "lognId=" + loginId + "&password=" + password,
            contentType: "application/json; charset=utf-8",

             success: function (result) {
                    returnVal = result.d;
                    alert(returnVal);
                },

                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    returnVal = '';
                    },
        });
     }


</script>

Answer 1

您无法链接 JavaScript 源文件并在同一标记中定义代码。只需将它们分成两个单独的标签，如下所示:

<script type="text/javascript" src="Scripts/jquery-1.4.1.js"></script>
<script type="text/javascript">
  function validatelogin() {

        $('input[type=button]').attr('disabled', true);
        $("#login").html('');
        var loginId = $('#txt_id').attr('value'); // get username
        var password = $('#txt_pwd').attr('value'); // get password

        $.ajax({

            type: "POST",
            url: "WebService.asmx/validateLogin",
            data: "lognId=" + loginId + "&password=" + password,
            contentType: "application/json; charset=utf-8",

             success: function (result) {
                    returnVal = result.d;
                    alert(returnVal);
                },

                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    returnVal = '';
                    },
        });
     }


</script>

引用MDN on the issue :

src

This attribute specifies the URI of an external script; this can be used as an alternative to embedding a script directly within a document. script elements with an src attribute specified should not have a script embedded within its tags.