JSFiddle - React, Tailwind, and code Playground

by GopsAB

HTML

<select multiple id="output">
    <option>dsfsd</option>
</select>

<button id="btn">Click</button>

JavaScript

var ele = document.getElementById("btn");
         ele.addEventListener("click",
                              function()
                              {
                 elem = document.getElementById("output");
                                  for(var i=0;i<elem.length;i++)
                                  {
                                      elem.options[i]=null
                                  }
                  opt = document.createElement("option");                
                                  opt.text = "one";
                                  elem.appendChild(opt);
                                  
             }
             );