这是一段代码

<script src="../Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            var comment = $("#TextArea1").val();
            $("#Button1").click(function () {
                $.post("noFreshComment.ashx", { "comment": comment}, function (data, status) {
                    if (status == "success") {
                        if (data == "插入成功") {
                            alert("评论成功");
                        }
                    }
                })
            });
        })
    </script>

代码中第四行的语句,传到$.post()里的comment时为"",但是如果把第四行的语句移到$("#Button1").click里时,为什么就能把正常的值传递给$.post()里的comment了?