ES5中Object的扩展

Object.create(prototype,[descriptor])

"use strict";
var student={
    school:"xxx High School",
    name:"xxx",
    position(){
        console.log(this.name+"的职务是"+this.type);
    }
};
var mintor=Object.create(student,{
    type:{
        value:"班长",
        wirtable:false,
        configurable:false,
        enumerable:true
    },
    name:{
        value:"jpc",
        writable:true,
        configurable:true,
        enumerable:true
    },
    getName:{
        value:()=>{
            return this.name;
        },
        writable:false,
        configurable:false,
        enumerable:false
    }
});
console.log(mintor);

Object.defineProperty(object,prop,descriptor)

  var student={
      name:"jpc"
  };
  Object.defineProperty(student,"age",{
      value:19,
      writable:true,
      configurable:true,
      enumerable:true
  })
  console.log(student);

Object.defineProperties(object,descriptors)

  var student={
      firstName:"牛",
      lastName:"一一"
  };
  Object.defineProperties(student,{
      fullName:{
          get:function (){
              return this.firstName+this.lastName;
          },
          set:function (data){
              this.firstName=data[0];
              this.lastName=data[1];
          }
      }
  });
  console.log(student.fullName);

简化写法

  var student={
      firstName:"牛",
      lastName:"一一",
      get fullName(){
          return this.firstName+this.lastName;
      },
      set fullName(data){
          this.firstName=data[0];
          this.lastName=data[1];
      }
  };
  console.log(student.fullName);