组选择器
<script src="jquery-1.6.4.js" type="text/javascript"></script>
<html>
<div id="aaaa" class="red">测试1</div>
<div id="bbbb" class="blue">测试2</div>
<div id="cccc" clas="orange">测试3</div>
<span class="red">SPAN</span>
</html>
<script>
$(function(){
$("h2,#aaa,div.red").css("color","red")
console.log($(".red")[0].innerHTML)
})
</script>