- 不到万不得已,不要写死 width 和 height
- 尽量用高级语法,如 calc、flex
- 如果是 IE,就全部写死
- 布局的div只用来做布局,内容新建一个div去写
- 需要兼容IE8:
float布局: 定宽
- 不需要兼容IE8:
flex布局:弹性宽度
- 给子元素加:
float: left
或float:right
- 父元素清除浮动:
clearfix
- 如果宽度不够,可以用 margin: 0 -4px;
.clearfix:after{
content: '';
display: block;
clear: both;
}
.clearfix{
zoom: 1;
}
- 父元素加
display:flex
- 父元素加
justify-content: space-between;
- 如果宽度不够,可以用 margin: 0 -4px;
pc端:
+-------------------------------------------------------+
| |
| +--------+ +----+ +----+ +---+ +----+ |
| | logo | | 菜单| |菜单| |菜单| |菜单 | |
| +--------+ +----+ +----+ +---+ +----+ |
| +-----------------------------------------------+ |
| | | |
| | banner | |
| | | |
| | | |
| | | |
| +-----------------------------------------------+ |
| |
| +--------+ +---------+ +---------+ +---------+ |
| | | | | | | | | |
| | | | | | | | | |
| +--------+ +---------+ +---------+ +---------+ |
| +--------+ +---------+ +---------+ +---------+ |
| | | | | | | | | |
| +--------+ +---------+ +---------+ +---------+ |
| |
| +------------+ +-------------------------------+ |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| | | | | |
| +------------+ +-------------------------------+ |
| |
+-------------------------------------------------------+
手机端:
+-----------------------------+
| +--------+ +----+ |
| | | |----| |
| +--------+ +----+ |
| +-------------------------+ |
| | | |
| | | |
| | | |
| +-------------------------+ |
| +--------+ +----------+ |
| | | | | |
| | | | | |
| +--------+ +----------+ |
| +--------+ +----------+ |
| | | | | |
| +--------+ +----------+ |
| +--------+ +----------+ |
| | | | | |
| +--------+ +----------+ |
+-----------------------------+
<body>
<style>
* {box-sizing: border-box;}
.clearfix:after{content: ''; display: block; clear:both;}
.clearfix {zoom: 1;} /*IE6*/
.parent {border: 1px solid; padding: 5px;
background: #ddd; text-align: center; min-width: 600px;
}
.logo {border: 1px solid;
background: black; color: white; width: 70px;
line-height: 36px;
}
.menu > div {border: 1px solid;
line-height: 36px; margin-left: 10px;}
.banner {
border: 1px solid; width: 600px; height: 200px;
margin: 10px auto 0 auto; background: #ccc;
}
.pictures { width: 600px; margin: 10px auto 0 auto; }
.middle { margin: 0 -20px; }
.picture {
width: 120px; height: 80px; background: red;
border: 1px solid;
}
/*使用float布局*/
/* .pic-float { float: left; margin: 20px; } */
/*使用flex布局,这种如果一行有三个,那么也是左对齐*/
.pictures-flex { display: flex; flex-wrap: wrap; }
.pic-flex { margin: 15px; width: calc(25% - 30px); margin-bottom: 10px; }
.middle { margin: 0 -15px; }
/*使用flex布局,这种的一行必须4个, 否则会两边对齐,*/
/* .pictures-flex {
display: flex; flex-wrap: wrap; justify-content: space-between;
}
.pic-flex { width: 130px; margin-bottom: 10px; }
.middle { margin: 0; } */
/*广告*/
.art { border: 1px solid; margin: 0 auto; width: 600px; }
.one {
height: 200px; border: 1px solid; background: #aaa;
width: calc(33.3% - 20px); margin-right: 20px;
}
.two {
height: 200px; border: 1px solid; background: #eee; width: 66.66%;
}
/*使用float布局*/
/* .art >div { float: left; } */
/*使用flex布局*/
.art { display: flex; }
</style>
<div class="parent clearfix">
<div class="logo" style="float: left">logo</div>
<div class="menu clearfix"style="float: right">
<div style="float: left">菜单1</div>
<div style="float: left">菜单2</div>
<div style="float: left">菜单3</div>
<div style="float: left">菜单4</div>
<div style="float: left">菜单5</div>
</div>
</div>
<div class="banner"></div>
<div class="pictures clearfix">
<div class="middle pictures-flex">
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<div class="picture pic-float pic-flex"></div>
<!-- <div class="picture pic-float pic-flex"></div> -->
</div>
</div>
<div class="art clearfix">
<div class="one">广告1</div>
<div class="two">广告2</div>
</div>
</body>
add不能作为CSS类名, 因为很有可能被广告屏蔽软件屏蔽。
代码在上面的基础上加了一些,
- CSS样式加载上面代码的后面,这样当切换手机浏览时,后面的样式覆盖前面,就应用手机布局。
- 上面的菜单加了一个按钮,当手机上浏览时,PC上的菜单影藏,改成按钮显示。
<style>
.parent .menu2 {display: none;}
@media (max-width: 420px) {
* {margin: 0; padding: 0;}
.parent {min-width: auto;}
.parent .menu {display: none;}
.parent .menu2 {display: block;}
.banner {width: auto;}
/*这里使用overflow是因为图片的div宽度大于屏幕宽度了,所以加上了hidden*/
.pictures { width: auto; overflow: hidden;}
.pic-flex { width: calc(50% - 30px);}
.art { width: auto; flex-direction: column;}
.one,.two { width: auto; margin: 0;}
}
</style>
<div class="menu2">三</div>
<!-- http://js.jirengu.com/qucof/12/edit?html,output -->
布局切换的时候,宽度变化的时候,想要图片不变形,那么久不要用img标签。使用 背景图片。
div {
background: transparent url(https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3591147451,1203661331&fm=27&gp=0.jpg) no-repeat center;
background-size: cover;
}
如果非要全显示搜索固定比例div