ID和类都起标记识别作用，那么他们在应用效果上有区别吗？

Question

ID和类都起标记识别作用，那么他们在应用效果上有区别吗？

Answer 1

ID and class both play a role in tag identification, so is there any difference in their application effects? -PHP Chinese website Q&A-ID and class both play the role of mark recognition, so are there any differences in their application effects? -PHP Chinese website Q&A

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Answer 2

ID在html中是唯一的，即html文档中只能有一个ID，就像身份证号码一个人能只有一个，而类在HTML可以有多个