web开发布局---传统布局篇

 1     <section>
 2         <!-- 传统布局-例1结构：盒子模型 -->
 3         <div class="layout-one">
 4             <div class="header">header</div>
 5             <div class="banner">banner</div>
 6             <div class="content">main-content</div>
 7             <div class="footer">footer</div>
 8         </div>
 9 
10         <!-- 传统布局-例2结构：盒子模型 + float -->
11         <div class="layout-two">
12             <div class="header">header</div>
13             <div class="banner">banner</div>
14             <div class="content">
15                 <div class="content-left">content-left</div>
16                 <div class="content-right">content-right</div>
17             </div>
18             <div class="footer">footer</div>
19         </div>
20 
21         <!-- 传统布局-例3结构 + float + position -->
22         <div class="layout-three">
23             <div class="header">header</div>
24             <div class="main-banner">banner</div>
25             <div class="main-content">
26                 <div class="content1">content1</div>
27                 <div class="content2">content2</div>
28             </div>
29             <div class="footer">footer</div>
30         </div>
31     </section>

 1         /* 基本样式 */
 2         section {
 3             width: 1200px;
 4             height: 300px;
 5             margin: 0 auto;
 6             padding: 10px;
 7         }
 8         .layout-one, .layout-two, .layout-three {
 9             float: left;
10             margin-left: 20px;
11         }
12         div {
13             width: 300px;
14         }
15         
16         /* 可复用样式 */
17         .header {
18             height: 25px;
19             text-align: center;
20             background-color: bisque;
21             line-height: 25px;
22         }
23         .banner {
24             height: 50px;
25             text-align: center;
26             line-height: 50px;
27             background-color: aquamarine;
28         }
29         .footer {
30             height: 25px;
31             text-align: center;
32             line-height: 25px;
33             background-color: black;
34             color: #ffffff;
35         }
36 
37         /* 结构1 基础样式 */
38         .layout-one .content {
39             height: 60px;
40             text-align: center;
41             line-height: 60px;
42             background-color: aqua;
43         }
44 
45         /* 结构2 基础样式 */
46         .layout-two .content {
47             height: 60px;
48             text-align: center;
49             line-height: 60px;
50             background-color: aqua;
51         }
52         .layout-two .content-left {
53             width: 100px;
54             float: left;
55             border-right: 1px solid #000000;
56         }
57         .layout-two .content-right {
58             width: 199px;
59             float: left;
60         }
61 
62         /* 结构3 基础样式 */
63         .main-banner {
64             width: 200px;
65             height: 50px;
66             margin: 0 auto;
67             background-color: aquamarine;
68             text-align: center;
69             line-height: 50px;
70         }
71         .main-content {
72             position: relative;
73             width: 200px;
74             height: 60px;
75             margin: 0 auto;
76             text-align: center;
77             line-height: 60px;
78         }
79         .content1 {
80             width: 60px;
81             height: 60px;
82             position: absolute;
83             top: 0px;
84             left: 30px;
85             background-color: aqua;
86         }
87         .content2 {
88             width: 60px;
89             height: 60px;
90             position: absolute;
91             top: 0px;
92             right: 30px;
93             background-color: aqua;
94         }