Summary of content:
##1. div and span
(1) Block-level tag: div
(2) Inline tag: span
As shown in the picture:
2. Box model (important)
Note: You can view the box using the browser’s debugging tool
(1) margin: box outer margin
(2) padding: box inner margin (will change the size of the block)
(3) border: box border width
(4) width: box width
(5) height: box height
Example:
①: The difference between outer margin and inner margin:
demo.html
<!doctype html>
<html>
<head>
<title>Div+Css布局(div+span以及盒模型)</title>
<meta charset="utf-8">
<style type="text/css">
body{
margin:0;
padding:0;
background:#C5C1AA;
}
div{
height:500px;
margin:60px;
padding:o;
border:solid 2px black;
background-color:rgba(255,0,0,0.7);
}
div.div1{
height:400px;
margin:0 audio;
border:solid 3px black;
background-color:rgba(0,0,255,0.7);
}
</style>
</head>
<body>
<div>
<div class="div1">
<h1 style="text-align:center;">欢迎登录系统</h1>
<h4 style="text-align:center;">账号:<input style="text"></h4>
<h4 style="text-align:center;">密码:<input style="text"></h4>
</div>
</div>
</body>
</html>Copy after login
②: Box model div placement Example:
demo.html
<!doctype html>
<html>
<head>
<title>Div+Css布局(div+span以及盒模型)</title>
<meta charset="utf-8">
<style type="text/css">
body{
margin:0;
padding:0;
background-color:rgba(0,0,255,0.3);
}
div{
width:500px;
height:500px;
background-color:rgba(250,128,10,0.8);
margin:0 auto; /* 使div居中*/
border:solid black;
}
div.div1{
float:left; /* 向左排列/*
background-color:rgba(255,0,0,0.4);
border:solid blue;
height:244px;
width:244px;
margin:0;
padding:0;
}
</style>
</head>
<body>
<div>
<div class="div1"></div>
<div class="div1"></div>
</div>
</body>
</html>Copy after login
3. Layout-related attributes (important)
(1) position Positioning method ①. Normal positioning: relative ②. Positioning according to the parent element: absolute ③. Positioning according to the browser window: fixed ④. No positioning: static ⑤. Inherit: inherit (2) Positioning ①.left:XXpx (left) away from the page vertex Distance ②.right: The distance of XXpx (right) from the page vertex ③.top: The distance of XXpx (top) from the page vertex ④.bottom: The distance of XXpx (bottom) from the page vertex (3) z-index layer coverage sequence (Priority) ①.-1,0,1,2,3; when it is -1, the layer is the lowest layer
(4) display display attribute (switching between block-level labels and inline labels )
①.display: none layer is not displayed
②.display: block block display, wrap after the element, display the next block element
③.display: inline inline display, multiple blocks can be Displayed in one line
(5) float floating attribute
①.left: left floating
②.right: right floating
[b] (6) clear clear float[ /b]
①.clear: both
[b] (7) overflow overflow processing[/b]
①.hidden hides content that exceeds the layer size
②. scrollAdd scroll bars regardless of whether the content exceeds the layer size
③.auto Automatically add scroll bars when exceeding the limit
[b]Example:[/b]
①: Fixed position and layout demo
<!doctype html>
<html>
<head>
<title>Div+Css布局(布局相关的属性)</title>
<meta charset="utf-8">
<style type="text/css">
body{
padding:0;
margin:0;
}
div.diva{
position:relative; /* 一定要添加，如没添加其子元素则不生效*/
margin:50px;
width:500px;
height:500px;
background-color:rgba(255,0,0,0.4);
}
.spanb{
position:absolute;
background-color:blue;
color:black;
top:-10px;
right:0;
}
.fixed{
padding:20px;
background:green;
position:fixed;
left:0;
top:40px;
z-index:1; /* z-index的value值可为-1,0,1,2;当为-1时，该图层为最底层 */
}
</style>
</head>
<body>
<div class="fixed">
<p>联系人：翁孟铠</p>
<p>联系电话：XXXxxxx</p>
<p>地址：XXXXXXXXXXX</p>
</div>
<div class="diva">
<span class="spanb">浏览次数：222</spn>
</div>
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</body>
</html>Copy after login
②: Floating and overflow effects demo
<!doctype html>
<html>
<head>
<title>Div+Css布局(浮动以及溢出处理)</title>
<meta charset="utf-8">
<style type="text/css">
body{
padding:0;
margin:0;
}
.div{
width:auto;
height:auto;
background:#f1f1f1;
margin:0 auto;
color: black;
}
.left{
width: 300px;
height: 400px;
position: inherit;
top: 60px;
background:yellow;
float: left;
color: black;
}
.right{
float: left;
width: 1049px;
height: 400px;
position: inherit;
top: 60px;
background:lavenderblush;
color: black;
}
.top{
width: auto;
height: 60px;
background: royalblue;
position: inherit;
top:0;
}
.bottom{
clear: both;
margin-top:20px;
width: 960px;
height: 20px;
background: red;
}
.jianjie{
height: 80px;
width: 200px;
background: brown;
overflow: auto;
}
</style>
</head>
<body>
<div class="div">
<div class="top">logo</div>
<div class="left">左边</div>
<div class="right">
简介:<br>
<div class="jianjie">
1、这是简介<br>
2、我们在做溢出测试<br>
3、hidden 隐藏超出层大小的内容<br>
4、scroll无论内容是否超出层大小都添加滚动条<br>
5、auto 超出时自动添加滚动条
</div>
</div>
<div class="bottom"></div>
</div>
</body>
</html>Copy after login
The above is the css folding style (4)—— The content of div+css layout, for more related content, please pay attention to the PHP Chinese website (www.php.cn)!
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