我将这坨伪类分成三组，第一组：nth-child，nth-last-child，only-child第二组：nth-of-type，nth-last-of-type，第三组：first-of-tpye，last-of-type，第四组：first-child，last-child。我将这坨伪类分成三组，第一组：nth-child，nth-last-child，only-ch
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nth-child,nth-last-child，only-child,nth-of-type,nth-last-of-type,only-of-type,first-of-type,last-of-type,first-child,last-child伪类区别和用法
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