求大神解释，为什么jQuery .mouseover()方法，会在IE下无效？

Question

如题，代码在火狐 Google浏览器下都没有问题，只是在IE下没有反应 
html 代码

<div class="cjy-top">
<span class="cjy-tit fn-left"></span>
<span class="cjy-tab fn-left">
<a id="class1" href="javascript:void(0)" class="cur">1</a>
<a id="class2" href="javascript:void(0)" href="">2</a>
<a id="class3" href="javascript:void(0)" href="">3</a>
<a id="class4" href="javascript:void(0)" href="">4</a>
<a id="class5" href="javascript:void(0)" href="">5</a>
<a id="class6" href="javascript:void(0)" href="">6</a>
<a id="class7" href="javascript:void(0)" href="">7</a>
</span>
js 代码

<script type="text/javascript">
$(function(){
$('.cjy-tab a').mouseover(function(){
var Id=$(this).attr("id");
$('.cjy-tab a').each(function(){
if(Id==$(this).attr("id"))
{
$("#"+Id).removeClass("").addClass("cur");
$("#lineList"+Id.replace("class","")).show();
}
else
{
$("#"+$(this).attr("id")).removeClass("cur").addClass("");
$("#lineList"+$(this).attr("id").replace("class","")).hide();
}
})
})

$('.gny-tab a').mouseover(function(){
var Id=$(this).attr("id");
$('.gny-tab a').each(function(){
if(Id==$(this).attr("id"))
{
$("#"+Id).removeClass("").addClass("cur");
$("#lineList"+Id.replace("class","")).show();
}
else
{
$("#"+$(this).attr("id")).removeClass("cur").addClass("");
$("#lineList"+$(this).attr("id").replace("class","")).hide();
}
})
})

})

//gny-tab
</script>

Answer 1

<script type="text/javascript">$(document).ready(function(){//加上这个$(document).click(function(){alert('this is work');});});</script>

Answer 2

写法有问题要这样写12345$(function(){&nbsp;&nbsp;&nbsp;&nbsp;$(document).click(function(){&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert('this&nbsp;is&nbsp;work');&nbsp;&nbsp;&nbsp;&nbsp;});});