Detailed introduction to Decorator in ES6

Decorator means decorator

1. Concept

A decorator is a function used to modify a class Behavior (Note: 1. Function 2. Modify behavior 3. Operate class)

1. Read-only modifier

{
  let readonly=function(target,name,descriptor){
    descriptor.writable=false;return descriptor
  };

  class Test{
    @readonly
    time(){      return '2017-03-11'}
  }

  let test=new Test();  // test.time=function(){
  //   console.log('reset time');
  // }; 将报错  如果修改的话
  console.log(test.time());
}

　You can also modify it in front of the class

{
  let typename=function(target,name,descriptor){
    target.myname='hello';
  }

  @typename
  class Test{

  }

  console.log('类修饰符',Test.myname);//hello  // 第三方库修饰器的js库：core-decorators; npm install core-decorators}

　

{
  let log=(type)=>{return function(target,name,descriptor){
      let src_method=descriptor.value;
      descriptor.value=(...arg)=>{
        src_method.apply(target,arg);
        console.info(`log ${type}`);
      }
    }
  }

  class AD{
    @log('show')
    show(){
      console.info('ad is show')
    }
    @log('click')
    click(){
      console.info('ad is click');
    }
  }

  let ad=new AD();
  ad.show();
  ad.click();
}

The above is the detailed content of Detailed introduction to Decorator in ES6. For more information, please follow other related articles on the PHP Chinese website!