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数据分析师2017-09-30 22:53:08
What are the advantages of class selectors? -PHP Chinese website Q&A-What are the advantages of class selectors? -PHP Chinese website Q&A
Please watch and learn.
PHP中文网2016-12-19 11:55:42
可以选择出多个元素,#id只能选出一个元素
迷茫2016-12-19 11:51:10
可以实现代码的复用,多个样式效果可以叠加!