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margin.html
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margin.html
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<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="UTF-8">
<title>margin 的用法</title>
<link rel="stylesheet"
href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-light.min.css">
<style>
h3 {
margin: 0;
}
pre {
width: 800px;
}
.container {
margin: 10px 0;
background-color: #efecf4;
border: 1px solid transparent;
width: 600px;
}
.container + .container {
margin-top: 20px;
}
.container2 {
margin: 10px 0;
background-color: #efecf4;
width: 600px;
}
.inner {
color: #fff;
background-color: #00b0e0;
}
</style>
</head>
<body>
<ol>
<li>
<h3>行内元素与块级元素(或行内块级元素) margin 行为表现的不一样</h3>
<div class="container">
<span class="inner" style="margin: 20px 50px;">行内元素 margin: 20px 50px;</span>
</div>
<div class="container">
<div class="inner" style="margin: 20px 50px;">
块级元素或行内块级元素 margin: 20px 50px;
</div>
</div>
<pre>
<code class="html">
<div class="container">
<span class="inner" style="margin: 20px 50px;">行内元素 margin: 20px 50px;</span>
</div>
<div class="container">
<div class="inner" style="margin: 20px 50px;">
块级元素或行内块级元素 margin: 20px 50px;
</div>
</div>
</code>
</pre>
</li>
<li>
<h3>margin 值为百分比时计算规则</h3>
<div class="container">
<div class="inner" style="margin: 2%;">
父元素 width 600px; 子元素 margin: 2%
</div>
</div>
<div class="container" style="height: 77px;">
<div class="inner" style="margin: 2%;position: absolute;">
父元素 width 600px; 子元素 margin: 2%;position: absolute;
</div>
</div>
<pre>
<code class="html">
<div class="container">
<div class="inner" style="margin: 2%;">
父元素 width 600px; 子元素 margin: 2%
</div>
</div>
<div class="container" style="height: 77px;">
<div class="inner" style="margin: 2%;position: absolute;">
父元素 width 600px; 子元素 margin: 2%;position: absolute;
</div>
</div>
</code>
</pre>
</li>
<li>
<h3>margin 重叠特性</h3>
<h4>兄弟元素重叠</h4>
<div class="container2">
<p class="inner" style="margin: 1em 0; line-height: 1em;">第一行</p>
<p class="inner" style="margin: 1em 0; line-height: 1em;">第二行</p>
</div>
<pre>
<code class="html">
<div class="container2">
<p class="inner" style="margin: 1em 0; line-height: 1em;">第一行</p>
<p class="inner" style="margin: 1em 0; line-height: 1em;">第二行</p>
</div>
</code>
</pre>
<h4>父子元素重叠</h4>
<div style="border-top: 1px solid #88C100;"></div>
<div class="container2">
<div class="inner" style="margin-top: 50px;">子元素</div>
</div>
<pre>
<code class="html">
<div class="container2">
<div class="inner" style="margin-top: 50px;">子元素</div>
</div>
</code>
</pre>
等同于给父元素设置 margin-top
<pre>
<code class="html">
<div class="container2" style="margin-top: 50px;">
<div class="inner">子元素</div>
</div>
</code>
</pre>
也等同于给父子元素同时设置 margin-top
<pre>
<code class="html">
<div class="container2" style="margin-top: 50px;">
<div class="inner" style="margin-top: 50px;">子元素</div>
</div>
</code>
</pre>
</li>
<li>
<h3>空block元素重叠</h3>
<div class="container">
<p class="inner" style="margin: 1em 0;"></p>
</div>
<pre>
<code class="html">
<div class="container">
<div class="inner" style="margin: 1em 0;"></div>
</div>
</code>
</pre>
</li>
<li>
<h3>margin auto 设置垂直居中</h3>
<div class="container" style="position: relative;height: 200px;">
<div class="inner"
style="position: absolute;left:0;right:0;top:0;bottom:0;height:100px;width:300px;margin: auto">
</div>
</div>
<pre>
<code class="html">
<div class="container" style="position: relative;height: 200px;">
<div class="inner"
style="position: absolute;left:0;right:0;top:0;bottom:0;
height:100px;width:300px;margin: auto">
</div>
</div>
</code>
</pre>
</li>
<li>
<h3>margin 重叠计算规则</h3>
<h4>参与折叠的 margin 都是正值</h4>
<div>
<div style="height:50px; margin-bottom:50px; width:50px; background-color: red;">A</div>
<div style="height:50px; margin-top:100px; width:50px; background-color: green;">B</div>
</div>
<pre>
<code class="html">
<div>
<div style="height:50px; margin-bottom:50px; width:50px; background-color: red;">A</div>
<div style="height:50px; margin-top:100px; width:50px; background-color: green;">B</div>
</div>
</code>
</pre>
<img src="http://linder0209.github.io/web-ui-guide/views/css/images/margin%20c2.png" alt="">
</li>
<li>
<h3>margin 重叠计算规则</h3>
<h4>参与折叠的 margin 都是负值</h4>
<div>
<div style="height:50px; margin-bottom:50px; width:50px; background-color: red;">A</div>
<div style="height:50px; margin-top:100px; width:50px; background-color: green;">B</div>
</div>
<pre>
<code class="html">
<div>
<div style="height:50px; margin-bottom:50px; width:50px; background-color: red;">A</div>
<div style="height:50px; margin-top:100px; width:50px; background-color: green;">B</div>
</div>
</code>
</pre>
<img src="http://linder0209.github.io/web-ui-guide/views/css/images/margin%20c2.png" alt="">
</li>
<li>
<h3>margin 重叠计算规则</h3>
<p id="marginCollapseRadio">
<input type="radio" name="marginCollapse" value="collapse" checked> collapse(重叠，默认值)
<input type="radio" name="marginCollapse" value="discard"> discard(取消margin 值)
<input type="radio" name="marginCollapse" value="separate"> separate(取消折叠)
</p>
<div id="marginCollapsePanel">
<div style="background: #009f3d;margin: 20px;">margin:20px;</div>
<div style="background: #0096be;margin: 50px;">margin:50px;</div>
</div>
</li>
</ol>
<script src="jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
<script>
$(function() {
$('#marginCollapseRadio input').change(function(){
var value = $(this).val();
$('#marginCollapsePanel div').css({
marginCollapse: value
});
});
});
</script>
</body>
</html>