剑指offer29顺时针打印矩阵

```javascript
/**
 * @param {number[][]} matrix
 * @return {number[]}
 */
 var spiralOrder = function(matrix) {
  let res = []
  let tem = ''
  try{
      while(matrix.length){
          let top = matrix.shift()
          for(let i =0;i<top.length;i++){
              tem = top[i]
              if(tem !== undefined){
              res.push(tem)
              }else{
                  return res
              }
          }
          for(let i=0;i<matrix.length;i++){
              tem = matrix[i].pop()
              
              if(tem !== undefined){
              res.push(tem)
              }else{
                  return res
              }
          }
          let bottom = matrix.pop()
          for(let i=bottom.length - 1;i>-1;i--){
              tem = bottom[i]
               if(tem !== undefined){
              res.push(tem)
              }else{
                  return res
              }
          }
          for(let i=matrix.length - 1;i>-1;i--){
              tem = matrix[i].shift()
               if(tem !== undefined){
              res.push(tem)
              }else{
                  return res
              }
              
          }

      }

  }catch(err){
      return res
  }
  
  return res

};
```