js原型链

//原型链 : 实例对象与原型之间的连接，叫做原型链


//原型链的最外层 : Object.prototype


function Aaa(){
//this.num = 20;
}
//Aaa.prototype.num = 10;
Object.prototype.num = 30;
Object.prototype.fk = 40;


var a1 = new Aaa();
//alert(a1.num);


var arr = new Array();


console.log(arr.__proto__);
console.log(Array.prototype);
console.log(arr.__proto__ == Array.prototype);

console.log(Array.prototype.__proto__);
console.log(Array.prototype.__proto__ == Object.prototype);