直接属性的命名，class选择器的命名和id选择器的命名有什么区别？

Answer 1

What is the difference between direct attribute naming, class selector naming and id selector naming? -PHP Chinese website Q&A-What is the difference between the naming of direct attributes, the naming of class selectors and the naming of id selectors? -PHP Chinese website Q&A

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Answer 2

ID选择器只能命名一次，类选择可以多次命名；类选择器可以为类设置多个样式，但是ID选择器不能；