在类选择器里可以设置文字的边框，可以调节字体大小，颜色。那为什么还要用子选择器？

Answer 1

In the class selector, you can set the border of the text and adjust the font size and color. So why use sub-selectors? -PHP Chinese website Q&A-In the class selector, you can set the text border and adjust the font size and color. So why use sub-selectors? -PHP Chinese website Q&A

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Answer 2

 类选择去器是指定那一类的标签，当你用选择器去指定它时才能使指定的部分添加样式，而子选择器直接作用在它的子代，使它的子代全部添加上该样式