Javascript クラスの書き方 進化版 - Qiita

'use strict' let Cat = (function() { let _share = 'only one'; let privates = new WeakMap(); let $ = function(o) { return privates.get(o); }; function Cat(name) { privates.set(this, {}); $(this).name = name; } Cat.prototype = { //self:function(){return privates.get(this);}, init:function(){}, load:function(){}, say:function(){console.log('my name is', $(this).name)}, getShare:function(){console.log