css中定位功能的总结 ：
position：absolute是绝对定位；
position：relative是相对定位，
position：fixed 是绝对定位的元素,相对于浏览器窗口进行定位，一般用于浏览器固定位置浮动
正常情况下在父元素设置position：relative后，子元素可以使用position：absolute进行绝对定位，优势是无论是浏览窗口如何缩放，位置都会保持不变，不会像float一样发生版面错位的bug。
本作业使用了绝对定位和相对定位，以及拓展引入使用了外部css框架，引入外部css框架可以更便捷的使用一些图标、样式提高开发的速度。头部图片使用了背景色加背景图片，然后使用的幻灯图片以模仿和官网一致的效果。
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*{
padding: 0;
margin: 0;
}
li{
list-style: none;
float: left;
}
a{text-decoration: none;}
.cont{
width: 1490px;
margin:30px auto;
overflow: hidden;
}
.hot{
width: 100%;
overflow: hidden;
}
h2{
padding:10px 0;
font-size: 24px;
display: block;
float: left;
width: 100px;
}
.head{
width: 100%;
height: 520px;
background: #29163A;
}
.head_cont{
width: 1583px;
margin:0 auto;
position: relative;
}
.banner{
width: 100%;
height: 520px;
background: url(../images/banner.jpg);
}
.logo{
position: absolute;
top: 21px;
left:46px;
z-index: 9;
}
.logo img{
width: 120px;
height: 24px;
}
.search{
position: absolute;
left:556px;
top: 15px;
}
.so{
width: 350px;
height: 22px;
padding: 8px 12px 8px 18px;
outline: 0 none;
color: #fff;
font-size: 14px;
line-height: 22px;
background: rgba(255,255,255,0.3);
border: 0 none;
border-top-left-radius: 19px;
border-bottom-left-radius: 19px;
}
.so1{
background: #B30702;
color: #FFEABF;
width: 80px;
height: 38px;
line-height: 38px;
top: 0;
right: -1px;
padding: 0;
color: #fff;
text-align: center;
font-size: 13px;
outline: 0;
cursor: pointer;
border: 0 none;
border-top-right-radius: 19px;
border-bottom-right-radius: 19px;
position: absolute;
right: -80px;
top: 0;
}
.menu{
position: absolute;
left:1230px;
top:15px;
color:#ccc;
}
.menu li{
display: block;
float: left;
padding:0 20px;
}
.menu a{
width: 40px;
height: 40px;
color: #fff;
font-size: 12px;
opacity: .6;
filter: alpha(opacity=60);
-ms-filter: "alpha(opacity=60)";
}
.menu a i{
display: block;
width: 20px;
height: 20px;
font-size: 20px;
}
.hot img{
width: 240px;
height: 362px;
}
.hot li{
display: block;
float: left;
width: 240px;
padding-right: 10px;
}
.hot li a{
display: block;
}
.hot li:last-child{
padding-right: 0
}
.hot_title{
line-height: 30px;
width: 100%;
height: 50px;
margin-top:20px;
}
.li_title{
color:#333;
font-size: 14px;
}
.li_des{
display: block;
color:#999;
font-size: 12px;
}
.tv ul.nav {
display:block;
float: left;
line-height: 50px;
}
.tv ul.nav li{
float: left;
display: block;
padding-left: 20px;
}
.tv ul.nav li a{
color: #333;
}
.tv_big_img{
/*padding-right: 10px;*/
width: 490px;
float: left;
}
.tv_big_img img{
width: 490px;
height: 334px;
}
.small{
display: block;
overflow: hidden;
width: 1000px;
}
.small li{
display: block;
float: left;
width: 240px;
padding-left: 10px;
padding-bottom: 22px;
}
.small li:nth-child(4n+4){
padding-right: 0px;
}
.small li img{
width: 240px;
height: 135px;
}点击 "运行实例" 按钮查看在线实例
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