jquery focus的用法

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'test.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script src="jquery/jquery-1.11/jquery.min.js"></script><style>.focused {    background: #abcdef;}</style><script>var test;$(function() {/* $("#content").delegate("*", "focus blur", function(event) { */$("#content").delegate("input", "focus blur", function(event) {var elem = $(this);setTimeout(function() {elem.toggleClass("focused", elem.is(":focus"));}, 0);});});</script></head><body><div id="content"><input type="text"> <input type="text"><select><option>select menu1</option><option>select menu2</option><option>select menu3</option></select><div>div</div></div></body></html>
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