常见的两列、三列布局，宽高自适应_html/css_WEB-ITnose
今天是猴年的第一天班，也是新的起点。分享一个如何用css实现我们在工作中常见的两列布局：1.左侧固定宽度，高度自适应右侧；2.左侧宽度高度固定，右侧自适应宽高；3.左侧、右侧固定宽，中间自适应。
1.左侧固定宽度，高度自适应右侧
- 效果图
pic1.png
pic2.png
- html+css你看代码，左侧确实没有定高，右侧也没有定宽。
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>左侧固定宽，自适应右侧高度</title><style> .main{ position: relative; color: #fff; } .left{ position: absolute; top: 0; left: 0; bottom: 0; width: 300px; background: #f00; } .right{ height: 200px; margin-left: 300px; background: #000; }</style></head><body><div class="main"> <div class="left">left</div> <div class="right">right</div></div></body></html>Copy after login
2.左侧宽度高度固定，右侧自适应宽高
- 效果图
pic3.png
- html+css你看代码，左侧确实定了宽高，右侧宽高都没有定。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>左侧宽度高度固定，右侧自适应宽高</title> <style> .main{ overflow: hidden; color: #fff; } .left{ float: left; width: 300px; height: 200px; background: #f00; } .right{ margin-left: -300px; padding-bottom: 9999px; margin-bottom: -9999px; background: #000; } </style></head><body> <div class="main"> <div class="left">left</div> <div class="right">right</div> </div></body></html>Copy after login
3.左侧、右侧固定宽，中间自适应
- 效果图
pic4.png
pic5.png
- html+css你看代码，左侧、右侧都固定了宽度，中间宽度自适应了。关键点是：float:left配合margin-left使用。同时center的div写在了左右的前面，更加符合语义化。
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>左侧、右侧固定宽，中间自适应</title> <style> .fl{ float: left; } .main{ color: #fff; } .center{ background: #9A0069; width: 100%; height: 300px; } .center .content{ padding: 0 100px; } .left{ width: 100px; height: 300px; margin-left: -100%; background: #009A61; } .right{ width: 200px; height: 300px; background: #00529A; margin-left: -200px; } </style></head><body> <div class="main"> <div class="center fl"> <div class="content"> center </div> </div> <div class="left fl">left</div> <div class="right fl">right</div> </div></body></html>Copy after login
但我们这里高度是写死的，如何实现既保持“左右固定宽，中间自适应”，又能够以一边的高度为基准，其他两个高度自适应呢？ 你可以参考1,2的代码来实现，这里就不写了。
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