JSFiddle - React, Tailwind, and code Playground

HTML

<p id="test">test</p>

JavaScript

var MyObj = function(obj) {
    this.obj = obj;
};

MyObj.prototype.bg = function (color) {
         var id = this.obj;
         if (id[0] == '#') {
           id = id.slice(1);
         }
         var a = document.getElementById(id);
          a.innerText = color;
          return this;
};


var $ = function (id) {
    
    return new MyObj(id);
};



$('#test').bg('0xFF0000').bg('green');