code: function createData() {
          var x, y, d = [];
          for (x = 0; x < 100; x += 1) {
              d[x] = {};
              for (y = 0; y < 20; y += 1) {
                  d[x][y] = y * x;
              }
          }
          return d;
      }
docs: this is not a real mode, just for fun you'll probably have to refresh the page to get rid of this timer