JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myclone">
<input type="text" class="mytext" id="mytext">
    </div>
<button class="myclonebtn" id="myclonebtn">複製一個textbox</button>

JavaScript

$(function() {
   $('#myclonebtn').click(function() {
       //複製mytext到div下面
       $( "#mytext" ).clone().prependTo( "div" )
    });
 
});