Double for loop case (use js jiujiu printing multiplication table)

1. The effect that needs to be achieved:

2. Realization ideas

(1) There are a total of 9 lines, because the number of each line is different, so a double for loop is used

(2) The outer layer is the number of lines i, the loop is here, and nine lines can be printed

(3) The inner for controls each row of formula j

(4) The number of formulas in each row is exactly the same as the number of rows, j<=i

3. Code snippet:

4. Realize the effect display