ES6 class道理

1.经由过程组织函数声明类

function People(name,age){
 this.name = name;
 this.age = age; 
}

People.prototype.say=function（）{
    console.log("hello)}
    
People.see=function（）{
    alert("how are you")}    

2.经由过程es6的class声明类

class People{
  constructor(name,age){
     this.name = name;
     this.age = age}
     
  static see(){alert("how are you")}  }
  
  say(){console.log("hello");}}

3.es6 class道理

• 起首得相识原型链的基础知识https://segmentfault.com/a/11…；

• 剖析：①People是一个类，也是一个函数；②constructor是一个对象指向的是People函数，该函数还挂了name和age属性；③将say函数挂载People的原型上。

• 代码

  let People = function(){ //第①步，建立People函数
   
   function People(name,age){//第②步，明白constructor就是指向People，People挂载着name和age两个属性
      this.name = name;
      this.age = age;}
     
   //将静态和动态的要领离别挂载在People的原型和People上。   
   creatClass(People,[{key:"say",value:function(){
       console.log(123)}}],[{key:"see",value:function(){
       alert("how are you")}}])  
       
   return People;}
   
  //这里的Constructor就是指的People  
  let creatClass = function({
    return function(Constructor,,protoProps,staticProps){
       //有原型上的要领挂载People.prototype上
       if(protoProps){defineProperties(Constructor.prototype,protoProps)}
        //有People对象上的要领挂载People上
       if(staticProps){defineProperties(Constructor,staticProps)}}
   
  //定义对象属性     
  let defineProperties =function(target, props) {
       for (var i = 0; i < props.length; i++) {
         var descriptor = props[i];
         Object.defineProperty(target, descriptor.key, descriptor);
       }
     }   
  })