npm install babel-plugin-transform-decorators-legacy --save-dev

"plugins": ["transform-decorators-legacy"]

@hometown hometown()

@hometown("山西")
@school
 class Student{
  constructor(name){
   this.name=name;
  }
  @studyke("HTML")
  study(){
   console.log(this.name+" is studying"+this.ke+"!")
  }
}

function hometown(diqu){
   //target.home="广灵";
   return function(target){
    target.home=diqu;
   }
  }

@hometown("山西")
class...

function school(target){
   console.log("123")
   target.schoolName="师徒课堂";
  }
  function hometown(diqu){
   //target.home="广灵";
   return function(target){
    target.home=diqu;
   }
  }

  function studyke(kemu){
   return function(target){
    target.ke=kemu;
   }
  }
  @hometown("山西")
  @school
  class Student{
   constructor(name){
    this.name=name;
   }
   @studyke("HTML")
   study(){
    console.log(this.name+" is studying"+this.ke+"!")
   }
  }
  console.log(Student.schoolName);
  console.log(Student.home);

  let l=new Student("xiaoA");
  l.study();

  @school
  function Teacher(){

  }