一、理论：
1.CSS盒模型
a.外盒尺寸计算--高度
element空间高度=内容高度+内距+边框+边距
b.外盒尺寸计算--宽度 element空间宽度=内容宽度+内距+边框+外距
c.内盒尺寸计算--高度
element高度=内容高度+内距+边框
d.内盒尺寸计算--宽度
element宽度=内容宽度+内距+边框
2.box-sizing
a.content-box 默认值
b.border-box 元素维持IE传统的盒模型
c.inherit 使元素继承父元素的盒模型模式
d.此值主要目的是控制元素的总宽度
二、实践：
1.
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css" > *{ margin: 0; padding: 0; } .wrapper{ width: 960px; margin-left: auto; margin-right: auto; color:#6bb2ff; font-size: 30px; text-align: center; } #header{ height: 100px; background: #228833; margin-bottom: 10px; } .sidebar{ float:left; width: 220px; margin-right: 20px; margin-bottom: 10px; height: 300px; background: #ebf3fc; } .content{ float:left; width: 720px; height: 300px; background: #ffcc99; margin-bottom: 10px; } #footer{ background: #a6f821; height: 100px; clear: both; } </style></head><body> <div class="wrapper"> <div id="header">hedaer</div> <div class="sidebar">left</div> <div class="content">main</div> <div id="footer">footer</div> </div></body></html>立即学习“前端免费学习笔记（深入）”；
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css" > *{ margin: 0; padding: 0; } .wrapper{ width: 960px; margin-left: auto; margin-right: auto; color:#6bb2ff; font-size: 30px; text-align: center; background: #ffcc99; } #header{ height: 100px; background: #228833; margin-bottom: 10px; padding: 10px; width: 100%; } .sidebar{ float:left; width: 220px; margin-right: 20px; margin-bottom: 10px; height: 300px; background: #ebf3fc; padding: 10px; } .content{ float:left; width: 720px; height: 300px; background: #ffcc99; margin-bottom: 10px; padding: 10px; } #footer{ background: #a6f821; height: 100px; clear: both; padding: 10px; width: 100%; } </style></head><body> <div class="wrapper"> <div id="header">hedaer</div> <div class="sidebar">left</div> <div class="content">main</div> <div id="footer">footer</div> </div></body></html>立即学习“前端免费学习笔记（深入）”；
立即学习“前端免费学习笔记（深入）”；
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css" > *{ margin: 0; padding: 0; } .wrapper{ width: 960px; margin-left: auto; margin-right: auto; color:#6bb2ff; font-size: 30px; text-align: center; background: #ffcc99; } #header{ height: 100px; background: #228833; margin-bottom: 10px; padding: 10px; width: 100%; border: 10px solid darkgray; } .sidebar{ float:left; width: 220px; margin-right: 20px; margin-bottom: 10px; height: 300px; background: #ebf3fc; padding: 10px; border: 10px solid red; } .content{ float:left; width: 720px; height: 300px; background: #ffcc99; margin-bottom: 10px; padding: 10px; border: 10px solid chartreuse; } #footer{ background: #a6f821; height: 100px; clear: both; padding: 10px; width: 100%; border: 10px solid #202189; } </style></head><body> <div class="wrapper"> <div id="header">hedaer</div> <div class="sidebar">left</div> <div class="content">main</div> <div id="footer">footer</div> </div></body></html>立即学习“前端免费学习笔记（深入）”；
立即学习“前端免费学习笔记（深入）”；
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css" > *{ margin: 0; padding: 0; } .wrapper{ width: 960px; margin-left: auto; margin-right: auto; color:#6bb2ff; font-size: 30px; text-align: center; background: #ffcc99; } #header{ height: 100px; background: #228833; margin-bottom: 10px; padding: 10px; width: 100%; border: 10px solid darkgray; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; -o-box-sizing:border-box; -ma-box-sizing:border-box; box-sizing: border-box; } .sidebar{ float:left; width: 220px; margin-right: 20px; margin-bottom: 10px; height: 300px; background: #ebf3fc; padding: 10px; border: 10px solid red; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; -o-box-sizing:border-box; -ma-box-sizing:border-box; box-sizing: border-box; } .content{ float:left; width: 720px; height: 300px; background: #ffcc99; margin-bottom: 10px; padding: 10px; border: 10px solid chartreuse; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; -o-box-sizing:border-box; -ma-box-sizing:border-box; box-sizing: border-box; } #footer{ background: #a6f821; height: 100px; clear: both; padding: 10px; width: 100%; border: 10px solid #202189; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; -o-box-sizing:border-box; -ma-box-sizing:border-box; box-sizing: border-box; } </style></head><body> <div class="wrapper"> <div id="header">hedaer</div> <div class="sidebar">left</div> <div class="content">main</div> <div id="footer">footer</div> </div></body></html>立即学习“前端免费学习笔记（深入）”；
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