因为hover不是标准的事件，因此无法直接使用live进行处理，故使用以下方法代替，效果一样。
$("<SPAN style="COLOR: #0000ff">table tr</SPAN>").live({
<SPAN style="BACKGROUND-COLOR: #99ccff">mouseenter:</SPAN>
function()
{
<SPAN style="COLOR: #008000">//todo</SPAN>
},
<SPAN style="BACKGROUND-COLOR: #99ccff">mouseleave:</SPAN>
function()
{
<SPAN style="COLOR: #008000">//todo</SPAN>
}
});
在循环输出的<div>中，只针对某个<div>下的内容进行处理的时：可以使用$(this).find()来实现:
<body>
<div class="<SPAN style="COLOR: #0000ff">water</SPAN>">
<div class="<SPAN style="COLOR: #0000ff">action</SPAN>" style="<SPAN style="COLOR: #3366ff">display:none</SPAN>">
<a href="#"><div class="left">{lang user/repick}</div></a>
<a href="#"><div class="right">{lang user/reply}</div></a>
</div>
</div>
<div class="<SPAN style="COLOR: #0000ff">water</SPAN>">
<div class="<SPAN style="COLOR: #0000ff">action</SPAN>" style="<SPAN style="COLOR: #3366ff">display:none</SPAN>">
<a href="#"><div class="left">{lang user/repick}</div></a>
<a href="#"><div class="right">{lang user/reply}</div></a>
</div>
</div>
<div class="<SPAN style="COLOR: #0000ff">water</SPAN>">
<div class="<SPAN style="COLOR: #0000ff">action</SPAN>" style="<SPAN style="COLOR: #3366ff; BACKGROUND-COLOR: #ffffff">display:none</SPAN>">
<a href="#"><div class="left">{lang user/repick}</div></a>
<a href="#"><div class="right">{lang user/reply}</div></a>
</div>
</div>
<div class="<SPAN style="COLOR: #0000ff">water</SPAN>">
<div class="<SPAN style="COLOR: #0000ff">action</SPAN>" style="<SPAN style="COLOR: #3366ff">display:none</SPAN>">
<a href="#"><div class="left">{lang user/repick}</div></a>
<a href="#"><div class="right">{lang user/reply}</div></a>
</div>
</div>
<script type="text/javascript">
$("<SPAN style="COLOR: #0000ff">.water</SPAN>").<SPAN style="COLOR: #800080">hover</SPAN>(
function (){
$(this).<SPAN style="COLOR: #800080">find</SPAN>("<SPAN style="COLOR: #0000ff">.action</SPAN>").show();
},
function (){
$(this).<SPAN style="COLOR: #800080">find</SPAN>("<SPAN style="COLOR: #0000ff">.action</SPAN>").hide();
}
)
</script>
</body>