JS构造函数和实例化的关系及原型引入

//这个自定义的构造函数在抽象

function Person(name,age,sex){

    this.name=name;

    this.age=age;

    this.sex=sex;

    this.say=function(){

        console.log("我叫",name)

    }

}

// 这个过程是实例化

let per1=new Person('司藤',300,'女');

per1.say();//调用





//let per1=new Person('司藤',300,'女');

console.log( per1.constructor===Person ) //返回的是true

 function Person(name,age,like) {

    this.name=name;

    this.age=age;

    this.like=like;

    this.say=function(){

        console.log('我可以不吃饭');

    }

}

var per1=new Person("司藤",300,'耍');

var per2=new Person('白浅','10000','耍');

per1.say();

per2.say();

console.log( per1.say==per2.say ) //false

function Person(name,age,like) {

    this.name=name;

    this.age=age;

    this.like=like;

    this.say=function(){

        console.log('我可以不吃饭');

    }

};

for (var index = 0; index < 100; index++) {

    var per=new Person("司藤",300,'耍');

    per.say();

}

function comSay(){

    // 执行相同的逻辑

    console.log('我可以不吃饭')

};



function Person(name,age,like) {

    this.name=name;

    this.age=age;

    this.like=like;

    this.say=comSay;//不要加括号

};

var per1=new Person("司藤",300,'耍');

var per2=new Person('白浅','10000','耍');

console.log( per1.say==per2.say ) //true

function Person(name,age,like) {

    this.name=name;

    this.age=age;

    this.like=like;

};

Person.prototype.comSay=function(){

    console.log('我可以不吃饭')

}

var per1=new Person("司藤",300,'耍');

var per2=new Person('白浅','10000','耍');

console.log( per1.comSay==per2.comSay ) //true

// 我们还可以通过原型来解决数据共享