nth-child,nth-of-type,first-of-type,last-of-type,nth-last-of-type,only-of-type等的區別

類型 *-child和*-of-type分別有五個前綴，即：nth，nth-last，first，last，only。 其中nth和nth-last需要傳入參數，即第n元素的n值。 first前綴等同於nth前綴傳入參數1，last前綴等同於nth-last傳入參數1。 即first-child和nth-child(1)等同，first-of-type和nth-of-type(1)等同，last-

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