JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button">click</button>

JavaScript

var checkObject = function() {};

checkObject.prototype = {
	checkName:function(){
  	alert(1)
  	return this;
  },
  checkEmail : function(){
  	alert(2)
    return this;
  },
  checkPassword : function(){
		alert(3)
    return this;
  }
};

var a = new checkObject();
a.checkPassword();
a.checkEmail();

a.checkName().checkEmail().checkPassword();