原生JS实现jQuery的链式调用

$("html").css();
$.get("/abc", function(){})

function gc() {
    return new gc.fn.abc();
}

gc.fn = gc.prototype = {
    abc: function () {
        this.__proto__ = gc.fn;
        return this;
    },
    de: function () {
        console.log('def');
    }
}
gc.aaa = function () {
    console.log('aaa');
}

gc();
gc().de();
gc.aaa();