<!doctype html>
<html lang="en">
<head>
<title>原型</title>
<script>
window.onload = function(){
//apply() call()区别
function Cat(name,color){ //猫对象
this.name = name;
this.color = color;
};
var cat = new Cat();
var o = {};
Cat.apply(o,['111','222']); //Cat函数在O对象中执行
o.name;//"111"
//call
function Cat(name,color){ //猫对象
this.name = name;
this.color = color;
};
var cat = new Cat();
var o = {};
Cat.call(o,'aaa','bbb'); //Cat函数在O对象中执行
o.name;//"aaa"
function Animal(){ //动物对象 父
this.type = '动物'
};
Animal.prototype.type2='动物';
function Cat(name,color){ //猫对象 子
this.name = name;
this.color = color;
};
Cat.prototype = Animal.prototype;
var cat = new Cat("大明","黄色"); //实例化
console.log(cat.type);
function People() {
this.name='sonia';
this.sayName= function() {console.log(this.name)};
};
People.prototype.walk="walk";
var p1=new People();
p1.name="p1";
p1.sayName= function() {console.log('p1')};
var p2=new People();
p2.name="p1";
p2.sayName= function() {console.log('p2')};
//原型链
function F1(){
this.name1='1'
};
function F2(){
this.name2='2'
};
function F3(){
this.name3='3'
};
F2.prototype = new F1();
F3.prototype = new F2();
var ff = new F3();
console.log(ff.name2);
//修改原型数据
function F1(){
//this.name1='1'
};
F1.prototype.name1 = 'f1';
function F2(){
this.name2='2'
};
function F3(){
this.name3='3'
};
F2.prototype = new F1();
F3.prototype = new F2();
var ff = new F3();
console.log(ff.__proto__.__proto__.__proto__.name1 = 'abc');
console.log(F1.prototype);
//删除原型数据
function F1(){
//this.name1='1'
};
F1.prototype.name1 = 'f1';
function F2(){
this.name2='2'
};
function F3(){
this.name3='3'
};
F2.prototype = new F1();
F3.prototype = new F2();
var ff = new F3();
delete ff.__proto__.__proto__.__proto__.name1;
console.log(F1.prototype);
//原型链 构造函数 /原型/实例 的关系
//函数对象中有prototype 原型对象prototype里有constructor属性，指向原型对象所属的构造函数
//对象都有__proto__属性 指向函数的原型对象
}
</script>
</head>
<body>
</body>
</html>
Original: https://www.cnblogs.com/Dewumu/p/14395357.html
Author: 德乌姆列特
Title: JavaScript原型链
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