HTML

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>自适应主页</title>

     <link rel="stylesheet" href="test.css">

 </head>

 <body>

 <!--文档主体内容-->

 <!--头部-->

 <header>

     <div id="navmenu">

         <span class="title">HTML5+CSS3+JS 自适应主页</span>

         <span class="loginleft"><a href="#">登录</a></span>

         <ul>

             <li class="borderleft"><a href="#" target="_blank">主页</a></li>

             <li><a href="#" target="_blank">导航菜单</a></li>

             <li><a href="#" target="_blank">导航菜单</a>

                 <!--下拉列表 -->

                 <ul>

                     <li class="top"><a href="#" target="_blank">导航菜单</a></li>

                     <li ><a href="#" target="_blank">导航菜单</a></li>

                     <li><a href="#" target="_blank">导航菜单</a></li>

                 </ul>

             </li>

             <li><a href="#" target="_blank">关于我们</a>

                 <!--下拉列表-->

                 <ul>

                     <li class="top"><a href="#" target="_blank">关于我们</a></li>

                     <li><a href="#" target="_blank">关于我们</a></li>

                     <li><a href="#" target="_blank">关于我们</a></li>

                 </ul>

             </li>

         </ul>

         <span class="login"><a href="#" >登录</a></span>

     </div>

 </header>

 <!--内容 三部分-->

 <div class="content">

     <!--左侧-->

     <div class="leftBox">

         <div class="navleft">

             <ul class="navleftmenu">

                 <li><a onclick="on_html5_click();">HTML5</a></li>

                 <li><a onclick="on_css3_click();">Css3</a></li>

                 <li><a onclick="on_js_click();">JavaScript</a></li>

                 <li><a onclick="on_chrome_click();">Chrome</a></li>

                 <li><a onclick="on_firefox_click();">Firefox</a></li>

                 <li><a onclick="on_safari_click();">Safari</a></li>

             </ul>

         </div>

     </div>

     <!--中间-->

     <div class="middleBox">

         <p>large image:</p>

         <img id="id-image-large" src="3.jpg" alt="image_large">

     </div>

     <!--右侧-->

     <div class="rightBox">

         <p>small image:</p>

         <img id="id-image-small" src="3.jpg" alt="image_small">

     </div>

 </div>

 <!--尾部-->

 <footer>

     <p>copyright &copy; 2017king &amp;king,</p>

 </footer>

 <script type="text/javascript" src="test.js"></script>

 </body>

 </html>

css

 *{

     margin:;

     padding:;

 }

 header{

     display:flex;

     width:100%;

     background:#fff;

 }

 #navmenu{

     float:none;

     position:relative;

     height:auto;

     margin:0 auto;

     width:100%;

     font-family: sans-serif;

     font-size:14px;

     color:#666;

     background-color:#f8f8f8;

 }

 #navmenu span.title{

     float:left;

     position:relative;

     margin:0 auto;

     padding:20px;

     font-family:DotumChe;

     font-size:14px;

     font-weight:bold;

     color:#333;

     text-align:center;

     width:auto;

     height:auto;

 }

 #navmenu span.loginleft{

     float:left;

     position:relative;

     margin:0 auto;

     padding:20px;

     font-size:12px;

     color:#666;

     text-align:center;

     visibility:hidden;

     width:auto;

     height:auto;

 }

 #navmenu ul{

     list-style: none;

 }

 #navmenu ul li{

     float:left;

     position:relative;

 }

 #navmenu ul li a{

     text-decoration: none;

     text-align:center;

     display:block;

     color:#666;

     padding:20px;

     border-right: 1px solid #e9e9e9;

 }

 #navmenu ul li a:hover{

     background: #c0c0c0;

     color:#fff;

 }

 #navmenu ul li ul{

     display:none;

 }

 #navmenu ul li:hover ul{

     display:block;

     position:absolute;

     top:56px;

     left:;

     min-width: 190px;

 }

 #navmenu ul li:hover ul li a{

     display: block;

     background: #c0c0c0;

     color:#fff;

     width:110px;

     text-align: center;

     border-bottom:1px solid #f2f2f2;

 }

 #navmenu ul li:hover ul li a:hover{

     background: #c0c0c0;

     color:#fff;

 }

 #navmenu ul li:hover ul li a:hover{

     background: cadetblue;

     color:#fff;

 }

 .borderleft{

     border-left:1px solid #e9e9e9;

 }

 .top{

     border-top:1px solid #f2f2f2;

 }

 #navmenu span.login{

     float:right;

     position:relative;

     margin:0 auto;

     padding:20px;

     font-size:12px;

     color:#666;

     text-align:center;

     visibility: visible;

 }

 #navmenu span.login a{

     font-size:12px;

     color:#888;

     text-decoration: none;

 }

 .content{

     zoom:;

 }

 .content:after{

     content:'.';

     display:block;

     height:;

     clear:both;

     visibility:hidden;

 }

 .content .leftBox{

     float:left;

     width:20%;

     min-width: 192px;

     height:auto;

     margin:5px;

     background: #e8e8e8;

     display:inline;

     transition: width 1s ease;

     -webkit-transition: width 1s ease;

     -moz-transition: width 1s ease;

     -o-transition: width 1s ease;

 }

 .content .middleBox{

     float:left;

     width:60%;

     min-width:320px;

     height:auto;

     margin:5px;

     background: #f0f0f0;

     display:inline;

     transition:width 1s ease;

     -webkit-transition: width 1s ease;

     -moz-transition: width 1s ease;

     -o-transition: width 1s ease;

 }

 .content .middleBox p{

     margin:8px;

     padding:4px;

 }

 .content .rightBox{

     float:left;

     width:15%;

     min-width:128px;

     height:auto;

     margin:5px;

     background:#e8e8e8;

     display:inline;

     transition:width 1s ease;

     -webkit-transition: width 1s ease;

     -moz-transition: width 1s ease;

     -o-transition: width 1s ease;

 }

 .content .rightBox p{

     margin:4px;

     padding:2px;

 }

 .content .rightBox img{

     margin:4px;

     padding:2px;

 }

 .navleft{

     float:left;

 }

 .navleft ul{

     list-style:none;

 }

 ul.navleftmenu{

     width:auto;

     padding:8px 16px 8px 16px;

 }

 ul.navleftmenu li{

     margin:8px 0 8px 0;

 }

 ul.navleftmenu li a{

     display:block;

     text-decoration: none;

     background: #cbcbcb;

     color:#666;

     padding:7px 15px 7px 15px;

     width:96px;

 }

 ul.navleftmenu li a:hover{

     background: #8a8a8a;

     color:#fff;

     padding:7px 20px 7px 26px;

 }

 footer{

     clear:both;

     position:absolute;

     width:100%;

     margin:auto;

     padding:16px 0 16px 0;

     bottom:;

     text-align:center;

     color:#666;

     background-color: #eee;

 }

 @media screen and (min-width:1024px){

     .content{

         width:auto;

         height:auto;

         margin:auto;

     }

 }

 @media screen and (min-width:800px)and(max-width:1024px){

     #navmenu span.title{

         width:100%;

         background-color: #fff;

     }

     #navmenu span.loginleft{

         visibility: visible;

     }

     #navmenu span.login{

         visibility: hidden;

     }

     .content{

         width:100%;

         height:auto;

     }

     .leftBox{

         width:30%;

     }

     .middleBox{

         width:65%;

     }

     .rightBox{

         visibility: hidden;

         width:;

     }

 }

 @media only screen  and (min-width: 400px) and(max-width:800px){

     #navmenu span.title{

         width:100%;

         margin:auto;

         background-color: #fff;

     }

     #navmenu span.loginleft{

         width:100%;

         margin:auto;

         visibility: visible;

         background-color: #fff;

     }

     #navmenu span.login{

         visibility: hidden;

     }

     .content{

         width:100%;

         height:auto;

     }

     .leftBox{

         width:30%;

     }

     .middleBox{

         width:auto;

     }

     .rightBox{

         visibility: hidden;

         width:;

     }

 }

 @media only screen and (max-width:400px) {

     .leftBox,.middleBox,.rightBox{

         float:left;

         position:relative;

         width:98%;

         height:auto;

     }

 }

js

 window.onload= {

     function on_html5_click() {

     document.getElementById("id-image-large").setAttribute("src", "3.jpg");

     document.getElementById("id-image-small").setAttribute("src", "3.jpg");

 }

     function on_css3_click() {

     document.getElementById("id-image-large").setAttribute("src", "3.jpg");

     document.getElementById("id-image-small").setAttribute("src", "3.jpg");

 }

     function on_js_click() {

     document.getElementById("id-image-large").setAttribute("src", "3.jpg");

     document.getElementById("id-image-small").setAttribute("src", "3.jpg");

   }

 }

实现web主页的大部分页面元素：

包括：顶部工具条导航菜单，登录链接，左侧导航菜单，右侧边栏，左侧菜单项与页面主体内容的联动和页面页脚。

实现了自适应web主页媒体查询功能，可以根据浏览器分辨率大小自动调整页面元素的布局。

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