class publicE{ constructor(){ } $(name){ return document.querySelector(name) } _(name){ return document.querySelectorAll(name) } customMethods(){ Element.prototype.add=function(name){ this.classList.add(name) } Element.prototype.remove=function(name){ this.classList.remove(name) } Element.prototype.none = function() { this.style.display = "none" } Element.prototype.show = function() { this.style.display = "block" } } } var {$, _ ,customMethods} =new publicE customMethods()