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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
Please watch and learn.
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