HTML 元素的分类
块元素
可以设置宽度和高度，独立成行。如 h1-6，p,div,ul,li。
行内元素
又称内联元素、行级元素，
不可以设置宽度和高度，不独立成行。如 a，span。
行内块元素
可以设置宽度和高度，不独立成行。如 img,input,button。
display 属性
block:转换为块元素
inline:转换为行内元素
inline-block:转换为行内块元素
none:隐藏元素
两个 DIV 在同一行显示
将元素设置为浮动元素（float），块元素可以在同一行显示。
float 属性有三个取值：
*1.none；2.right；3.left；**
float属性就俩常用的值（left 和 right），把元素浮到页面的左边或者右边
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| float: left;
float: right;
float: none;
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浮动元素的特性
脱离文档流
空 div 清除浮动
伪元素清除浮动
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.clear::before,
.clear::after {
content: "";
display: block;
clear: both;
}
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示例代码
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
a,
#h1-1 {
width: 100px;
height: 100px;
border: 1px solid red;
display: none;
}
img {
width: 100px;
}
</style>
</head>
<body>
<a id="h1-1">hello h1-1</a>
<a>hello h1-2</a>
<img src="http://img.xiaozhoubg.com/FnhSmWuOhn90sV3WHSFTMsXKm5n9" alt="" />
<img src="http://img.xiaozhoubg.com/FnhSmWuOhn90sV3WHSFTMsXKm5n9" alt="" />
</body>
</html>
|
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
.clear::before,
.clear::after {
content: "";
display: block;
clear: both;
}
.content {
width: 300px;
height: 200px;
border: 1px solid red;
float: left;
}
.aside {
width: 100px;
height: 200px;
border: 1px solid blue;
float: left;
}
.box {
width: 400px;
height: 400px;
background-color: yellow;
}
</style>
</head>
<body>
<div class="container clear">
<div class="content">内容</div>
<div class="aside">边栏</div>
</div>
<div class="box"></div>
</body>
</html>
|
作业 1
html 文件
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<link rel="stylesheet" href="style/css-浮动布局-作业.css" />
</head>
<body>
<ul class="list">
<li class="clear">
<div class="pic">
<img
src="http://img.xiaozhoubg.com/FiOyW_stqM9JdK9dg0Ou0jKb2rFG"
alt=""
/>
</div>
<div class="title"></div>
<h3>前端学习开发手册</h3>
<p>2021年7月18日</p>
<a href="">阅读</a>
</li>
<li class="clear">
<div class="pic">
<img
src="http://img.xiaozhoubg.com/FiOyW_stqM9JdK9dg0Ou0jKb2rFG"
alt=""
/>
</div>
<div class="title"></div>
<h3>前端学习开发手册</h3>
<p>2021年7月18日</p>
<a href="">阅读</a>
</li>
</ul>
</body>
</html>
|
css 文件
css-浮动布局-作业.css
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| * {
margin: 0px;
padding: 0px;
}
.list .pic img {
width: 200px;
height: 150px;
}
.pic {
width: 200px;
float: left;
}
.title {
width: 300px;
float: left;
}
.clear::after,
.clear::before {
content: "";
display: block;
clear: both;
}
.title a {
display: block;
width: 80px;
height: 30px;
background-color: green;
color: white;
text-align: center;
text-decoration: none;
line-height: 30px;
}
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作业 2
html 文件
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<link rel="stylesheet" href="style/css-浮动布局-作业2.css" />
</head>
<body>
<div class="thhead">
<p class="selected">精选手册 <a href=""></a></p>
<a href="/book" class="seemore">查看更多</a>
<img class="seemore_img" src="../../images/右箭头.png" alt="" />
</div>
<ul>
<li class="web">
<a href="/book/bookDetail/79">
<img
class="javascript"
src="http://img.xiaozhoubg.com/FiOyW_stqM9JdK9dg0Ou0jKb2rFG"
alt=""
/>
<div class="web_container">
<p class="web-book">前端开发学习手册</p>
<p class="data">2020-06-09</p>
<button class="read">阅读</button>
</div>
</a>
</li>
<li class="web">
<a href="/book/bookDetail/77">
<img
class="javascript"
src="http://img.xiaozhoubg.com/FkUt9OW9MqOXUed2HWJMJzN3Ppv3"
alt=""
/>
<div class="web_container">
<p class="web-book">Java 开发学习手册基础篇</p>
<p class="data">2020-06-09</p>
<button class="read">阅读</button>
</div>
</a>
</li>
<li class="web">
<a href="/book/bookDetail/82">
<img
class="javascript"
src="http://img.xiaozhoubg.com/FnhSmWuOhn90sV3WHSFTMsXKm5n9"
alt=""
/>
<div class="web_container">
<p class="web-book">程序员面试题</p>
<p class="data">2020-08-12</p>
<button class="read">阅读</button>
</div>
</a>
</li>
</ul>
</body>
</html>
|
css 文件
css-浮动布局-作业 2.css
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| * {
margin: 0;
padding: 0;
}
.thhead .selected {
float: left;
flex: 11;
margin-left: 16px;
font-size: 20px;
width: 100px;
}
.thhead .seemore {
float: right;
flex: 1;
color: rgb(158, 158, 158);
font-size: 16px;
width: 120px;
}
.seemore_img {
opacity: 0.5;
margin-top: 2px;
margin-right: 26px;
}
.thhead {
display: flex;
align-items: center;
width: 953px;
height: 50px;
background-color: #ffffff;
}
.web {
width: 953px;
height: 200px;
float: left;
margin-top: 10px;
background-color: #ffffff;
}
li {
list-style-type: none;
}
a {
text-decoration: none;
color: #000000;
-webkit-tap-highlight-color: rgba(255, 255, 255, 0);
-webkit-user-select: none;
-moz-user-focus: none;
-moz-user-select: none;
}
a:link {
text-decoration: none;
}
.web .javascript {
width: 230px;
height: 150px;
float: left;
margin-top: 25px;
margin-left: 16px;
}
.web_container {
display: flex;
width: 670px;
overflow: hidden;
flex-direction: column;
margin-left: 25px;
float: left;
}
.web .web-book {
font-size: 18px;
margin-top: 35px;
}
.web .data {
margin-top: 11px;
color: #c9c9c9;
}
.web .read {
width: 88px;
height: 40px;
margin-top: 36px;
border-radius: 5px;
background-color: #e3f0fc;
border: 1px solid #e3f0fc;
color: #7db4fe;
}
|