判断当前树节点的深度

getCurrentTreeDeep(treeData) {
     let arr = [];
     arr.push(treeData);
     let depth = 0;
     while (arr.length > 0) {
          let temp = [];
          for (let i = 0; i < arr.length; i++) {
              temp.push(arr[i]);
          }
          arr = [];
          for (let i = 0; i < temp.length; i++) {
              if (temp[i].children && temp[i].children.length > 0) {
                  for (let j = 0; j < temp[i].children.length; j++) {
                      arr.push(temp[i].children[j]);
                  }
              }
           }
           if (arr.length >= 0) {
               depth++;
           }
      }
      return depth;
}