在javascript中将此3d数组转换为2d数组

function convert3DTo2D(arr3D) {
  var arr2D = [];
  
  for (var i = 0; i < arr3D.length; i++) {
    for (var j = 0; j < arr3D[i].length; j++) {
      for (var k = 0; k < arr3D[i][j].length; k++) {
        arr2D.push(arr3D[i][j][k]);
      }
    }
  }
  
  return arr2D;
}

// 示例用法
var arr3D = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]];
var arr2D = convert3DTo2D(arr3D);
console.log(arr2D);