js对象与jquery对象的相互转化：
1、$(js对象)
2、$(selector).get(索引)、$(selector)[索引]
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<style> ???????div { ???????????width: 700px; ???????????height: 600px; ???????????margin: 50px auto; ???????????background-color: blue; ???????} ???</style> ???<script src="jquery-1.11.1.js"></script> ???<script> ???????// $(document).ready(function () { ???????// ????$("button:eq(0)").click(function () { ???????// ????????$("body").css("backgroundColor", ""); ???????// ????}); ???????// ????$("button:eq(1)").click(function () { ???????// ????????$("body").css("backgroundColor", "black"); ???????// ????}); ???????// }); ???????$(function () { ???????????var btnArr = document.getElementsByTagName("button"); ???????????$(btnArr[0]).click(function () { ???????????????$("body").get(0).style.backgroundColor = ""; ???????????}); ???????????$(btnArr[1]).click(function () { ???????????????$("body")[0].style.backgroundColor = "black"; ???????????}); ???????}); ???</script></head><body><button>开灯</button><button>关灯</button><div></div></body></html>jQuery——开关灯
原文地址：http://www.cnblogs.com/wuqiuxue/p/8031363.html