<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").toggle(function(){
$("body").css("background-color","green");},
$("body").css("background-color","red");},
$("body").css("background-color","yellow");}
<button>请点击这里,来切换不同的背景颜色</button>