思路很簡單 縱向走， 走一步，刪一個，，橫向走 ，走一行，刪一行

//沒優化  簡單寫了下   
var arr = [
    [1,2,3,4],
    [12,13,14,5],
    [11,16,15,6],
    [10,9,8,7]
];

var newArr=JSON.parse(JSON.stringify(arr));
consoles(newArr,'left')
function consoles(newArr,direction){
    if(newArr.length==0)return
 switch (direction) {
    case 'left'
 
:
                    for(var left=0; left<newArr[0].length;left++){
                        console.log(newArr[0][left]);
                        //newArr[0].splice(0,1);
                    }
                     newArr.splice(0,1);

                    consoles(newArr,'down');
         break;
    case 'right'
 
:
    var index=newArr.length-1;
        newArr[index]=newArr[index].reverse();
         for(var right=0;right< newArr[index].length;right++){
             console.log(newArr[index][right]);
        }
         newArr.splice(index,1);

         consoles(newArr,'up');
         break;
    case 'down'
 
:
         for(var down=0;down< newArr.length;down++){
            console.log(newArr[down][newArr[down].length-1]);
            newArr[down].splice(newArr[down].length-1,1);

         }
         consoles(newArr,'right');
         break; 
    case 'up':
         for(var up=0;up<newArr.length;up++){
            console.log(newArr[newArr.length-up-1][0]);
            newArr[newArr.length-up-1].splice(0,1);
          }
         consoles(newArr,'left')
         break; 
break;
     default:
         break;
 }


}

結果是 控制檯列印 1-16