JavaScript two-dimensional array rectangle inverted (only for rectangles)

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You want to invert the two-dimensional array of this rectangular arrangement.

Reach

9 8 2

0 9 4

2 0 6

1-1 8

The effect,

Idea: A top-down traversal of a rectangle, i.e. 9 8 2 0 9 4 2 0 6 1-1 8

Traverse thinking: arr.length=3;arr[0].leng=4; to arr.length=3; Traverse for the main for loop

Code

1. var arr1=[[2,4,6,8],[8,9,0,-1],[9,0,2,1]];//array 2.       for (Var i=0;i<arr1.length;i++) {//Traversal 3 for the first time.          for (Var j=0;j<arr1[i].length;j++) {4.        Document.writeln ("arr1[i][j]+"); 5.        } 6.         Document.writeln ("<br/>"); 7. }

The results are now output

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And then upside down.

8. for (Var x=0;x<arr1[0].length;x++) {9.               for (Var y=arr1.length-1;y>=0;y--) {10.               Document.writeln ("arr1[y][x]+"); 11.              }12.              Document.writeln ("<br/>"); 13. }

Output: Inverted success. Only for rectangles

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JavaScript two-dimensional array rectangle is inverted (only for rectangles)