JSFiddle - React, Tailwind, and code Playground
HTML
<div id="main" class="banana apple orange strawberry mango" >div main</div>
<div id="main2" class="fruit">main2</div>
JavaScript
var getAllClass = $("#main").attr("class");
getAllClass=getAllClass.replace("mango","")
$("#main2").attr("class",getAllClass);
alert($("#main2").attr("class"));