vue+element树组件实现树懒加载的过程详解

 @PostMapping("/tree")
 public JSONObject tree( ) {return userService.tree();
 }

 @PostMapping("/tree2")
 public JSONObject tree(@RequestParam Map user) {return userService.tree2(user);
 }

 /**
  * 树
  */
 JSONObject tree();
 
 /**
  * 树
  */
 JSONObject tree2(Map user);

 @Override
 public JSONObject tree() {
  List list=userDao.tree();
  System.out.println(list);
  return CommonUtil.successPage(list);
 }
 @Override
 public JSONObject tree2(Map user) {
  int codept=Integer.parseInt(user.get("id").toString()) ;
  List list=userDao.tree2(codept);
  return CommonUtil.successPage(list);
 }

 /**
  * 树
  */
 List tree();
 List tree2(@Param("codept")int codept);

 
  SELECT [id]
  ,[codept]
  ,[name]
 FROM [dbo].[Dept] WHERE codept ='0'
 

 
  SELECT [id]
  ,[codept]
  ,[name]
 FROM [dbo].[Dept] WHERE codept =#{codept}