JSFiddle - React, Tailwind, and code Playground

HTML

<span id="someid">check this phrase </span><br>
    <span id="result"></span>

JavaScript

var mystring = $("#someid").text();

    $("#someid").click( function (event) {
    if(/\s+$/.test(mystring)) {
      $("#result").text("space");    
      }
      else
      {
          $("#result").text("no space");
      
      }    
    
   });