<!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>jQuery鼠標點擊彈出登錄框代碼</title>
</head>
<body>
<br><br><br><br><br><br><br>
<div class="login-header"><a href="javascript:void(0);">點擊，彈出登錄框</a></div>
 <div class="login-header1"><a href="javascript:void(0);">點擊，彈出登錄框</a></div>

 <div id="js_login" class="js_login">
 <div class="js_title">
 <ul>
 <li class="conxk1" id="_xka1" onclick="switchTag('_xka','_xka_list',1,2,'conxk1','conxk2');">
 用戶登錄
 </li>
 <li class="conxk2" id="_xka2" onclick="switchTag('_xka','_xka_list',2,2,'conxk1','conxk2');">
 快速注冊
 </li>
 </ul> <span class="close-login">×</span>
 </div>
 <div class="js_content">
 <div class="con_dak fixed clear">
 <div id="_xka_list1" class="showbox">
 <div class="de_list">
 <!----------login start------>
 <div id="login">
 <div class="inputbg" id="logtext">
 <input name="logusername" id="logusername" type="text" value="輸入用戶名" placeholder="輸入用戶名" class="inputsub" />
 </div>
 <div class="inputbg" id="pass">
 <input name="logpassword" placeholder="輸入密碼" type="password" value="" id="logpassword" class="inputsub" />
 </div>
 <div class="buttons">
 <input type="button" class="sub_btn1" id="login-submokaoba" onclick="ajaxlogin()" value="登 錄" />
 </div>
 <div class="clr"></div>
 <div class="reg">
 忘記密碼？<a >找回密碼</a> <span id="errmsg"></span>
 </div>
 </div>
 <!--------login end--------->
 </div>
 </div>


 <div id="_xka_list2" class="hidden">
 <div class="de_list">
 <!--------register start--------->
 <form method="post" enctype="multipart/form-data" name="userinfoform" id="userinfoform">
 <input type="hidden" name="enews" value="register" />
 <input name="groupid" type="hidden" id="groupid" value="1" />
 <div id="register">
 <ul class="Reg-input">
  <li class="Reg-text">用戶名：</li>
  <li><input name="UserName" id="UserName" type="text" class="input-text" required="" /> <span class="UserName"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">密碼：</li>
  <li><input name="Password" onblur="CheckReg('Password', this.value)" type="password" id="Password" class="input-text" required="" /> <span class="Password"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">重復密碼：</li>
  <li><input name="repassword" onblur="CheckReg('repassword',this.value)" type="password" id="repassword" class="input-text" required="" /> <span class="repassword"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">真實姓名：</li>
  <li><input name="RealName" onblur="CheckReg('RealName', this.value)" type="text" id="RealName" class="input-text" required="" /> <span class="RealName"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">手機號碼：</li>
  <li><input name="Telephone" onblur="CheckReg('Telephone', this.value)" type="text" id="Telephone" class="input-text" required="" /> <span class="Telephone"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">E-mail：</li>
  <li><input name="Mail" onblur="CheckReg('Mail', this.value)" type="text" id="Mail" class="input-text" required="" /> <span class="Mail"></span></li>
 </ul>
 <ul class="Reg-input">
  <li class="Reg-text">&nbsp;</li>
  <li id="checkbox"><input type="checkbox" id="checkin" onclick="checkpass('all')" /> 我已閱讀并接受《<a href="/http://www.jiao4.com/javascript" target="_blank">服務條款</a>》</li>
 </ul>
 <div style="clear:both"></div>
 <div class="buttons">
  <input type="button" class="sub_btn1" id="Reg-submokaoba" onclick="ajaxzhuce()" name="zhuce" value="注 冊" />&nbsp;&nbsp;<span id="checkreg"></span>
 </div>
 <div class="clr"></div>
 </div>
 </form>
 <!--------register end--------->
 </div>
 </div>
 </div>
 </div>
 </div>
 <div class="login-bg"></div>
</body>
</html>

2接下來是樣式css

@charset "utf-8";
 /*/////*登陸//////by liangguanyu/////*/
 .js_login h1, h2, h3, h4, h5, h6, p, ul, li {
 padding: 0;
 margin: 0;
 list-style: none;
 }

 .login-header {
 text-align: center;
 height: 30px;
 font-size: 24px;
 line-height: 30px;
 }

 .js_login {
 display: none;
 position: fixed;
 opacity: 1;
 z-index: 11000;
 left: 50%;
 margin-left: -250px;
 top: 100px;
 }

 .js_login a {
 color: blue;
 text-decoration: none;
 }

 .sub_btn1 { /*position:absolute; right:0px; top:50px;*/
 width:105px;
 height:35px;
 display: inline-block;
 zoom: 1; /* zoom and *display = ie7 hack for display:inline-block */
 *display: inline;
 vertical-align: baseline;
 margin: 0 2px;
 outline: none;
 cursor: pointer;
 text-align: center;
 align-content:center
 font: 15px/100% Arial, Helvetica, sans-serif;
 text-shadow: 0 1px 1px rgba(0,0,0,.6);
 -webkit-border-radius: 3px;
 -moz-border-radius: 3px;
 border-radius: 3px;
 -webkit-box-shadow: 0 1px 2px rgba(0,0,0,.2);
 -moz-box-shadow: 0 1px 2px rgba(0,0,0,.2);
 box-shadow: 0 1px 2px rgba(0,0,0,.2);
 color: white; /*#e8f0de*/
 border: solid 1px #538312;
 background: #64991e; /* #64991e*/
 background: -webkit-gradient(linear, left top, left bottom, from(#43CD80), to(#3CB371)); /*#7db72f #4e7d0e*/
 background: -moz-linear-gradient(top, #7db72f, #4e7d0e);
 filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#7db72f', endColorstr='#4e7d0e');
 }

 .sub_btn1:hover {
 background: #538018;
 background: -webkit-gradient(linear, left top, left bottom, from(#2E8B57), to(#008B45));
 background: -moz-linear-gradient(top, #6b9d28, #436b0c);
 filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#6b9d28', endColorstr='#436b0c');
 }

 .inputbg {
 height: 40px;
 width: 280px;
 margin: 0 auto;
 margin-top: 20px;
 border-radius: 4px;
 border: 1px solid #eee;
 text-align: left;
 color: #333;
 }

 #username * {
 vertical-align: middle;
 }

 .inputsub {
 outline: 0;
 font-family: Tahoma,Geneva,sans-serif;
 font-size: 14px;
 width: 270px;
 float: left;
 border: none;
 text-align: left;
 color: #333;
 margin: 10px 0 3px 8px;
 background: none;
 overflow: hidden;
 }

 .buttons {
 width: 280px;
 margin: 0 auto;
 margin-top: 25px;
 text-align: left;
 }

 #login-submokaoba {
 width: 105px;
 height: 35px;
 }

 #qql {
 float: right;
 }

 .reg {
 padding: 20px;
 margin: 0 auto;
 width: 280px;
 }

 #login {
 margin-top: 20px;
 }

 .hidden {
 display: none;
 }

 .js_login {
 position: absolute;
 width: 500px;
 background: #fff;
 display: none;
 color: #999;
 }

 .js_login .js_title {
 overflow: hidden;
 height: 42px;
 background: #f9f9f9 url(http://www.jiao4.com/java) repeat-x;
 border-left: 1px solid #ccc;
 border-right: 1px solid #ccc;
 }

 .js_login .js_title span {
 float: right;
 line-height: 40px;
 padding: 0 9px;
 cursor: pointer;
 font-family: "";
 font-size: 30px;
 }

 .js_login .js_title span:hover {
 color: #555;
 }

 .js_login .js_title li {
 float: left;
 width: 130px;
 text-align: center;
 font-family: "微軟雅黑";
 font-size: 18px;
 cursor: pointer;
 height: 43px;
 }

 .js_login .js_title li a {
 float: left;
 width: 130px;
 text-align: center;
 }

 .js_login .js_title li a:hover {
 }

 .conxk1 {
 border-top: 3px solid #15B300;
 border-right: 1px solid #dfdfdf;
 background: #fff;
 height: 39px;
 line-height: 39px;
 color: #11B200;
 }

 .conxk1 a {
 color: #11B200;
 }

 .conxk1 a:hover {
 color: #11B200;
 text-decoration: none;
 }

 .conxk2 {
 border-right: 1px solid #dfdfdf;
 height: 39px;
 line-height: 39px;
 padding-top: 3px;
 color: #646464;
 }

 .conxk2 a {
 color: #646464;
 }

 .conxk2 a:hover {
 color: #646464;
 text-decoration: none;
 }

 .js_login .js_content {
 overflow: hidden;
 padding: 13px 15px;
 background: #fff;
 border: 1px solid #ccc;
 border-top-width: 0px;
 }

 .js_login .js_content .de_list {
 width: 100%;
 padding-top: 12px;
 }

 .js_login .js_content a:visited {
 color: blue;
 }

 .js_login .js_content a:hover {
 color: red;
 text-decoration: underline;
 }

 .Reg-input {
 display: block;
 clear: both;
 padding: 5px 0;
 }

 .Reg-input li {
 display: inline;
 float: left;
 }

 .Reg-input .input-text {
 width: 220px;
 height: 25px;
 border: 1px solid #ccc;
 outline: none;
 border-radius: 2px;
 }

 .input-text:focus {
 border: 1px solid #339933;
 }

 .Reg-input .Reg-text {
 width: 100px;
 text-align: right;
 font-size: 14px;
 }

 .Reg-input .input_text {
 width: 70px;
 float: left;
 }

 .js_login #checkbox {
 text-align: left;
 }

 .js_login #errmsg {
 color: red;
 }

 .js_login .sub_btn1 {
 font-size: 20px;
 }

 #lean_overlay {
 position: fixed;
 z-index: 100;
 top: 0px;
 left: 0px;
 height: 100%;
 width: 100%;
 background: #000;
 display: none;
 }

后面更上js，記得要把jquery給加上哦！紅色區(qū)域的代碼負責登陸注冊點擊切換的事件，在代碼點擊方法加上黃色代碼可在點擊后加載到當前界面！

<script type="text/javascript">
 $(function () {
 H_login = {};
 H_login.openLogin = function () {
 $('.login-header a').click(function () {
 switchTag('_xka', '_xka_list', 1, 2, 'conxk1', 'conxk2');
 $('.js_login').show();
 $('.login-bg').show();
 });
 $('.login-header1 a').click(function () {
 switchTag('_xka', '_xka_list', 2, 2, 'conxk1', 'conxk2');
 $('.js_login').show();
 $('.login-bg').show();
 });
 };
 H_login.closeLogin = function () {
 $('.close-login').click(function () {
 $('.js_login').hide();
 $('.login-bg').hide();
 });
 };
 H_login.loginForm = function () {
 };
 H_login.run = function () {
 this.closeLogin();
 this.openLogin();
 this.loginForm();
 };
 H_login.run();
 });
 function switchTag(tag, content, k, n, stylea, styleb) {
 for (i = 1; i <= n; i++) {
 if (i == k) {
 document.getElementById(tag + i).className = stylea;
 document.getElementById(content + i).className = "showbox"

 } else {
 document.getElementById(tag + i).className = styleb;
 document.getElementById(content + i).className = "hidden"
 }
 }
 };

 function ajaxlogin() {
 var username = $("#logusername");
 var usernameValue = $("#logusername").val();
 var password = $("#logpassword");
 var passwordValue = $("#logpassword").val();
 alert(usernameValue + passwordValue);
　　　　 window.location.reload();
 }

 function ajaxzhuce() {
 var usernameValue = $("#UserName").val();
 var passwordValue = $("#Password").val();
 var realNameValue = $("#RealName").val();
 var telephoneValue = $("#Telephone").val();
 var emailValue = $("#Mail").val();
 alert(usernameValue + passwordValue + realNameValue + telephoneValue + emailValue);
　　　　 window.location.reload();
 }
</script>

效果圖：