css的 nth-child, first-child, last-child

選取第n個標籤，n從1開始

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1. :nth-child(n)  

選取大於等於4的標籤

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1. :nth-child(n+4)  

選取小於等於4的標籤

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1. :nth-child(-n+4)  

選取偶數個，2n也可以用even

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1. :nth-child(2n)  

選取奇數個，2n-1也可以用even

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1. :nth-child(2n-1)  

表示隔兩個選一個標籤

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1. :nth-child(3n+1)  

選取最後一個標籤

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1. :last-child  

選取倒數第n個標籤

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1. :nth-last-child(n)  

選取第1個標籤

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1. :first-child