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数据分析师2017-09-30 23:28:51
What is the difference between ID selector and class selector in CSS? -PHP Chinese Q&A-What is the difference between ID selector and class selector in CSS? -PHP Chinese website Q&A
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迷茫2016-12-21 16:20:51
id是唯一的，类可多个使用id在用一页面中 原则上只可以出现一次，类可以出现多次一个标签只可以有一个id，而可以有多个类
