jQuery的封装方式与JS中new的实现原理

function jQuery() {
    return new jQuery.fn.init();
}

jQuery.fn = jQuery.prototype = {
    init: function() {
        return this;
    },
    showName: function() {
        console.log(this.name);
        return this;
    },
    showAge: function() {
        console.log(this.age);
        return this;
    },
    age: 13,
    name: "aaa"
}

jQuery.prototype.init.prototype = jQuery.prototype;


jQuery().showAge().showName();//链式调用

 

var Base = function(name) {
    this.name = name;
}

Base.prototype.get_name = function() {
    return this.name;
}

//方式一
var obj = new Base("pcd");
var name = obj.get_name();
console.log(name);//pcd

//方式二
var obj  = {};//创建一个obj对象
obj.__proto__ = Base.prototype;//将obj的原型指向Base.prototype
Base.call(obj,"pcd");//将Base中的this指向obj
var name = obj.get_name();
console.log(name);//pcd