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第十二期《es7装饰器介绍》 #12

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mynane opened this issue Mar 15, 2018 · 1 comment
Closed

第十二期《es7装饰器介绍》 #12

mynane opened this issue Mar 15, 2018 · 1 comment

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@mynane
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mynane commented Mar 15, 2018

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@mynane
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mynane commented Mar 15, 2018

ES6 Decorators(修饰器)

修饰器(Decorator)是一个函数,用来修改类的行为。这是ES7的一个提案,目前Babel转码器已经支持

我们在游戏大型项目种经常会用到的方法,现在es6直接支持

想要使用Decorator的话需要我们配置一下文件夹,配置一下环境

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

完事配置一下babelrc文件

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

先说一下装饰器的特点

装饰器本质是一个函数

@hometown hometown()

装饰对象可以使用多个装饰器

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

装饰器可以带参数

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

装饰器修饰 类

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(){
 
  }

总结

以上就是这篇文章的全部内容,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对脚本之家的支持。

@mynane mynane closed this as completed Feb 20, 2019
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