Correcting teacher:WJ
Correction status:qualified
Teacher's comments:总体来说写的很好,继续加油!
1.浮动之后会从文档流中脱离出来,即释放文档流中的位置;
2.浮动元素浮动后,它后面的元素会占据释放出来的空间大小;
3.浮动只对浮动元素后面的元素布局造成影响;
4.任何元素一旦浮动,就成为块级元素
5.浮动只能水平浮动;
6.浮动只限于内容区;
1.原因:父级元素包不住子级元素高度;
2.解决方案,代码展示:
css:
<style>
.container {
border: 3px dashed red;
}
.item {
width: 150px;
height: 150px;
}
.item:first-of-type {
background-color: lightgreen;
}
.item:nth-last-of-type(2) {
background-color: lightcoral;
}
.item:last-of-type {
background-color: lightblue;
}
/* 将三个子元素全部浮动 */
.item {
float: left;
}
/* 解决方案: 最简单的解决方案,用到BFC(块级格式化上下文) */
.container {
/* overflow: hidden; */
overflow: auto;
}
</style>
html:
<body>
<div class="container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
</div>
</body>
如图所示:
1.html代码部分:
<body>
<div class="header">
<div class="conter">
<ul>
<li>
<a href="">首页</a>
</li>
<li>
<a href="">618主会场</a>
</li>
<li>
<a href="">秒杀主会场</a>
</li>
<li>
<a href="">售后服务</a>
</li>
</ul>
</div>
</div>
<div class="container">
<div class="left">左侧</div>
<div class="main">中间部分</div>
<div class="right">右侧</div>
</div>
<div class="footer">
<div class="conter"><p>这是一个简单三列布局,使用定位实现</p></div>
</div>
</body>
2.CSS代码部分:
<style>
/* 初始化 */
* {
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
.header,
.footer {
height: 50px;
background-color: cadetblue;
}
.conter {
width: 960px;
margin: auto;
}
.conter p {
width: 960px;
margin: auto;
/* background-color: lawngreen; */
}
li {
list-style: none;
}
a {
text-decoration: none;
}
.conter > ul > li {
line-height: 50px;
float: left;
padding: 0 15px;
}
.conter > ul > li:hover {
background-color: darkorange;
}
.footer > .conter {
line-height: 50px;
text-align: none;
}
.container {
width: 960px;
min-height: 500px;
position: relative;
margin: 15px auto;
}
.container > .left {
width: 200px;
min-height: 500px;
background-color: lightcoral;
position: absolute;
top: 0px;
left: 0px;
}
.container > .right {
width: 200px;
min-height: 500px;
background-color: lightgreen;
position: absolute;
top: 0px;
right: 0px;
}
.container > .main {
width: 530px;
min-height: 500px;
background-color: lavender;
position: absolute;
top: 0px;
left: 215px;
}
</style>