The use of Nth-child

1,: Nth-child (2) Select the first few tags, "2 can be the number you want"

2,: Nth-child (n+4) Select greater than or equal to 4 tags, "n" represents the integer from the same

3: Nth-child (-n+4) Select less than or equal to 4 tags

4,: Nth-child (2n-1) Select the odd label, 2n-1 can be odd

5,: Nth-child (2n) Select even label, 2n can be even

6: Nth-child (3n+1) custom selection label, 3n+1 means "two take one"

7,: Last-child Select the last label

8,: Nth-last-child (3) Select the last number of labels, 3 means to select the 3rd

The use of Nth-child