JSFiddle - React, Tailwind, and code Playground

HTML

連絡地址：<br>
<input id="address" style="width:200px"/><br>
收件地址：<input id="isSameAddress" type="checkbox" onClick="checkAddress()" />同上<br>
<input id="receiverAddress" style="width:200px" />

JavaScript

function checkAddress() {
	if(document.getElementById('isSameAddress').checked == true) {
  	var text = document.getElementById('address').value;
  	document.getElementById('receiverAddress').value = text;
  } else {
  	document.getElementById('receiverAddress').value = '';
  }
}