JS对象添加属性和方法的多种方式

function Person(name,age,sex){
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.code = function(){
        console.log(this.name + " is coding");
    }
}
var xiaoming = new Person("xiaoming",10,"man");
console.log(xiaoming);// {name: "xiaoming", age: 10, sex: "man", code: ƒ}
xiaoming.code();// xiaoming is coding 

function Fruit(){}
var tomato = new Fruit();
tomato.name = "xihongshi";
tomato.color = "red";
tomato.use = function(){
    console.log(this.name + " can be to eat");
}
console.log(tomato);
tomato.use();

function Fruit(){}
var tomato = new Fruit();
tomato['name'] = "xihongshi";
tomato['color'] = "red";
tomato['use'] = function(){
    console.log(this.name + " can be to eat");
}
console.log(tomato);
tomato.use();

function Animal(){};
Animal.prototype.foots = 4;
Animal.prototype.weight = 200;
Animal.prototype.hobby = "sing";
Animal.prototype.have = function(){
    console.log("the animal have " + this.foots + " foot");
}
var pig = new Animal();
console.log(pig);
pig.have();// the animal have 4 foot

function Person(name,age,sex){
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.code = function(){
        console.log(this.name + " is coding");
    }
}
var xiaoming = new Person("xiaoming",10,"man");
console.log(xiaoming);// {name: "xiaoming", age: 10, sex: "man", code: ƒ}
xiaoming.code();// xiaoming is coding   
var xiaoming2 = Object.assign({}, xiaoming, {test1:'demo1', test2:'demo2'}); // 第一个参数是 目标对象，后面的全是源对象，执行完之后返回目标对象
console.log(xiaoming2);// {name: "xiaoming", age: 10, sex: "man", code: ƒ, test1: 'demo1', test2: 'demo2'}
xiaoming2.code();// xiaoming is coding   

function Person(name,age,sex){
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.code = function(){
        console.log(this.name + " is coding");
    }
}
var xiaoming = new Person("xiaoming",10,"man");
console.log(xiaoming);// {name: "xiaoming", age: 10, sex: "man", code: ƒ}
xiaoming.code();// xiaoming is coding   
var xiaoming2 = {...xiaoming, test1:'demo1', test2:'demo2'};
console.log(xiaoming2);// {name: "xiaoming", age: 10, sex: "man", code: ƒ, test1: 'demo1', test2: 'demo2'}
xiaoming2.code();// xiaoming is coding