:after的作用是在当前的应用元素后面添加内容如div:after{ content:"This is a demo"}还有就是清除浮动(参考代码):
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其他好文 时间：
2014-08-20 13:54:22
阅读次数：
164
Problem Description
After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have the solution. As well, wily 3xian made lots of n...
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其他好文 时间：
2014-08-20 12:36:32
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382
MySQL 触发器简单实例~~语法~~CREATE TRIGGER --触发器必须有名字，最多64个字符，可能后面会附有分隔符.它和MySQL中其他对象的命名方式基本相象.{ BEFORE | AFTER } --触发器有执行的时间设置：可以设置为事件发生前或后。{ INSERT | UPDA...
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数据库 时间：
2014-08-19 18:11:45
阅读次数：
250
Google Book
Time Limit: 1 Second
Memory Limit: 32768 KB
You, the best hacker in the world, want to download the books published on Google Book. After some investigation, you found that...
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其他好文 时间：
2014-08-19 16:38:05
阅读次数：
222
使用after伪类清除浮动.department li:after{content:".";height:0;visibility:hidden;display:block;clear:both;}
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其他好文 时间：
2014-08-19 16:00:04
阅读次数：
212
Countries in War
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 2407
Accepted: 751
Description
In the year 2050, after different attempts of the UN to m...
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其他好文 时间：
2014-08-19 10:59:04
阅读次数：
230
Heavy TransportationTime Limit:3000MSMemory Limit:30000KTotal Submissions:20364Accepted:5401DescriptionBackgroundHugo Heavy is happy. After the breakd...
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其他好文 时间：
2014-08-19 10:48:24
阅读次数：
291
Error Codes The ERRNO values below are set when API calls fail. Use?xn_getlasterror?to retrieve the error code after an API call fails. Functionxn_geterror_string) can be used to retrieve the str...
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其他好文 时间：
2014-08-18 18:58:43
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441
Every concurrent Request uses some resources for running. If we find that the concurrent request is taking long time and decided to terminate the conc...
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其他好文 时间：
2014-08-18 14:24:02
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160
Description
Samball is going to travel in the coming vacation. Now it's time to make a plan. After choosing the destination city, the next step is to determine the travel route. As this poor guy has ...
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其他好文 时间：
2014-08-18 10:50:54
阅读次数：
334
