<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>动画菜单</title> <style> *{margin:0;padding:0;} .head{font-size:12px;padding:6px 0 0 10px;} #login_box{width:300px;height:150px;background:#eee; border:1px solid #ccc;position:absolute;left:50%;top:50%;margin-left:-150px;margin-top:-75px;display:none;} #login_box p{height:20px;border-bottom:1px solid #ccc;font-size:12px;padding:6px 0 0 5px;font-weight:bold;} #close{width:14px;height:14px;position:absolute;right:4px;top:6px;} </style> <script type="text/javascript" src="http://code.jquery.com/jquery-3.2.0.min.js"></script> <script> $("#login").click(function(){ $("#login_box").css("display","block"); }); $("#close").click(function(){ $("#login_box").css("display","none"); }); </script></head><body> <div class="head">亲，您好！<input type="button" value="登 录" id="login"></div> <div id="login_box"> <p>用户登录</p><span id="close">X</span> </div></body></html>/*点击按钮后，<div id="login_box">的display没有改变，哪出了问题？*/
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