There are no two dimensional arrays in Javascript, so you have to use a jagged array, i.e. an array of arrays.
Initialise it using literal arrays:
var arr = [[ 1, 2, 3 ], [ 4, 5, 6 ]];
Or the Array constructor:
var arr = new Array(10);
for (var i = 0; i < 10; i++) {
arr[i] = new Array(10);
}
An array is not a visual element, so to display it you would loop through each outer and inner array, and draw something that represents each item.
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solved Two dimensional array in Javascript with a certain cell size [closed]