//m*n的二维数组，顺时针打印
// []

const m = 5;
const n = 6;
let arr = []
for(let i = 0; i < m; i++){
  arr[i] = [];
  for(let j = 0; j < n; j++){
    arr[i][j] = '' + i + j
  }
  console.log(arr[i])
}

let row = [0, m-1];
let col = [0, n-1];
let direction = 'right';

function print(row, col){

  if(row[0] > row[1] || col[0] > col[1]) {
    return
  };

  if(direction === 'right'){
    for(let j = col[0]; j <= col[1]; j++){
      console.log(arr[row[0]][j]);
    }
    direction = 'down';
    row[0]++;

  }else if(direction === 'down'){
    for(let j = row[0]; j <= row[1]; j++){
      console.log(arr[j][col[1]]);
    }
    direction = 'left';
    col[1]--;
  }else if(direction === 'left'){

    for(let j = col[1]; j >= col[0]; j--){
      console.log(arr[row[1]][j]);
    }
    direction = 'up';
    row[1]--;
  }else if(direction === 'up'){
    for(let j = row[1]; j >= row[0]; j--){
      console.log(arr[j][col[0]]);
    }
    direction = 'right';
    col[0]++;
  }

  print(row, col);
}

print(row, col)