<!DOCTYPE html><html><head> ?<style> ?div { width:60px; height:60px; margin:10px; float:left; ???????border:2px solid blue; } ?.blue { background:blue; } ?</style> ?<script type="text/javascript" src="/jquery/jquery.js"></script></head><body> ?<div></div> ?<div></div> ?<div></div> ?<div></div> ?<div></div> ?<div></div> ?<script>$("body").find("div").eq(1).addClass("blue");</script></body></html>$(document).ready(function(){ ???$("p:eq(1)").css("background-color","#B2E0FF");});$(".ky-crsos-menubar li:eq(0)").addClass("hit");jQuery 遍历 - eq() 方法
原文地址：http://www.cnblogs.com/flytogalaxy/p/7514519.html