为何这个JS不能判断为空啊求解决一下

为什么这个JS不能判断为空啊求解决一下
<form action="/plus/diy.php" enctype="multipart/form-data" method="post">
<input type="hidden" name="action" value="post" />
<input type="hidden" name="diyid" value="1" />
<input type="hidden" name="do" value="2" />
    <table style="width:100%;" cellpadding="0" cellspacing="1">
      <tr>
        <td align="right" valign="top" style="display:none">姓名：</td>
        <td><input type='text' name='yyname' class="bd2 intxt" id='yyname'   value='' /></td>
      </tr>
      <tr>
        <td align="right" valign="top" style="display:none">电话：</td>
        <td><input type='text' name='yytel' id='yytel' class="bd2 bd1 intxt"    value='' /></td>
      </tr>
      <input type="hidden" name='time' id='time' value='' />
<input type="hidden" name="dede_fields" value="yyname,text;yytel,text;time,text" />
<input type="hidden" name="dede_fieldshash" value="ebc5e865308959c88aeb8daafb88e3ff" />
    </table>
    <p><strong>提示：</strong>提交预约后医院将及时与你电话联系信息仅作预约凭证，拒绝向第三方透露</p>
    <input type="submit" name="submit" value="提交预约" class='coolbg' />
  </form>
  <script type="text/javascript">
var lrsjobj=document.getElementById("time");

var sjobj=new Date();
var dqsj="2015-";
dqsj+=(sjobj.getMonth()+1)+"-";
dqsj+=sjobj.getDate()+" ";
dqsj+=sjobj.getHours()+":";
dqsj+=sjobj.getMinutes()+":";
dqsj+=sjobj.getSeconds();
lrsjobj.value=dqsj;
$(document).ready(function()
   {
    //验证
    $('#complain').submit(function ()
    {
        if($('#xm').val()==""){
            $('#xm').focus();
            alert("姓名不能为空！");
            return false;
        }
if (!$("#sj").val().match(/^(?:(?:0\d{2,3})-)?(?:\d{7,8})(-(?:\d{3,}))?$/)&&!$("#sj").val().match(/^(((13[0-9]{1})|159|153)+\d{8})$/)) {
alert("手机号码格式不正确！");
$("#sj").focus();
return false;
}
        if($('#sj').val()=="")
        {
            $('#sj').focus();
            alert("联系电话不能为空！");
            return false;
        }

    })

});
------解决思路----------------------

<!DOCTYPE html>

<html>

<head>

    <title></title>

    <meta charset="utf-8" />

</head>

<body>

<form action="/plus/diy.php" enctype="multipart/form-data" method="post" id="complain">

    <input type="hidden" name="action" value="post" />

    <input type="hidden" name="diyid" value="1" />

    <input type="hidden" name="do" value="2" />

    <table style="width:100%;" cellpadding="0" cellspacing="1">

        <tr>

            <td align="right" valign="top" style="display:none">姓名：</td>

            <td><input type='text' name='yyname' class="bd2 intxt" id='xm'   value='' /></td>

        </tr>

        <tr>

            <td align="right" valign="top" style="display:none">电话：</td>

            <td><input type='text' name='yytel' id='sj' class="bd2 bd1 intxt"    value='' /></td>

        </tr>

        <input type="hidden" name='time' id='time' value='' />

        <input type="hidden" name="dede_fields" value="yyname,text;yytel,text;time,text" />

        <input type="hidden" name="dede_fieldshash" value="ebc5e865308959c88aeb8daafb88e3ff" />

    </table>

    <p><strong>提示：</strong>提交预约后医院将及时与你电话联系信息仅作预约凭证，拒绝向第三方透露</p>

    <input type="submit" name="submit" value="提交预约" class='coolbg' />

</form>

<script src="../../jquery/jquery-1.11.3.js"></script>

<script type="text/javascript">

    var lrsjobj=document.getElementById("time");

    var sjobj=new Date();

    var dqsj="2015-";

    dqsj+=(sjobj.getMonth()+1)+"-";

    dqsj+=sjobj.getDate()+" ";

    dqsj+=sjobj.getHours()+":";

    dqsj+=sjobj.getMinutes()+":";

    dqsj+=sjobj.getSeconds();

    lrsjobj.value=dqsj;

    $(document).ready(function()

    {

        //验证

        $('#complain').submit(function ()

        {

            if($('#xm').val()==""){

                $('#xm').focus();

                alert("姓名不能为空！");

                return false;

            }

            if (!$("#sj").val().match(/^(?:(?:0\d{2,3})-)?(?:\d{7,8})(-(?:\d{3,}))?$/)&&!$("#sj").val().match(/^(((13[0-9]{1})
------解决思路----------------------
159
------解决思路----------------------
153)+\d{8})$/)) {

                alert("手机号码格式不正确！");

                $("#sj").focus();

                return false;

            }

            if($('#sj').val()=="")

            {

                $('#sj').focus();

                alert("联系电话不能为空！");

                return false;

            }


        })

    });

    </script>

</body>

</html>

id不对你的js和html完全不是一回事吧？

为何这个JS不能判断为空啊 求解决一下

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为何这个JS不能判断为空啊求解决一下