网上的例子用的是$(".b").live("click",function(event){} ，jquery自动对live做了处理，阻止了事件冒泡。改成bind，实验就能通过。
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="http://www.css88.com/tool/css3Preview/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(function(){
$(".b").bind("click",function(event){
$(this).css("color","#FF3300");
event.stopPropagation()//注释掉，<SPAN style="BACKGROUND-COLOR: rgb(255,255,255)">效果是不一样的。</SPAN>
})
});
</script>
</head>
<body>
<div id="temp"></div>
<div class="b" style="background:#3ff333">wrapwrapwrapwrapwrapwrapwrap
<div style="background:#ffff11" class="b">这是公告标题1</div>
<div style="background:#ffff11" class="b">这是公告标题2</div>
<div style="background:#ffff11" class="b">这是公告标题3</div>
<div style="background:#ffff11" class="b">这是公告标题4</div>
wrapwrapwrapwrapwrapwrapwrap
</div>
</body>
</html>
以上代码中添加与否
event.stopPropagation();