if(Input.GetKeyDown(KeyCode.Tab))

 {

     Transform gridTran = this.characterGrid.transform;

     InputField childInputField;

     // 这里遍历 Grid Layout Group 中的所有子节点

     for(int i=; i<gridTran.childCount-; ++i)

     {

         childInputField = gridTran.GetChild(i).GetComponent<InputField>();

         if (childInputField.isFocused)

         {

             EventSystem.current.SetSelectedGameObject(gridTran.GetChild(i+).gameObject);

             break;

         }

     }

 }