JSFiddle - React, Tailwind, and code Playground

HTML

<div id = 'myDiv'>
  <p>qwerty</p>
  	
  </div>

CSS

div {
				width: 100px;
				height: 100px;
				background-color: green;
			}

JavaScript

myDiv.addEventListener ('click', function (){ myAJAX.call(this)});  
		
function myAJAX(){
 
	let data = prompt ('введите число'," ");
	
	let  xhr = new XMLHttpRequest();
	xhr.open ('post', "/page1");
	//xhr.send(JSON.stringify({name: data}));
	
	xhr.send(data);
	console.log('запрос ушел')
	
	xhr.onreadystatechange = function(){
			if (xhr.readyState != 4){
				return
				
			}
		
		console.log(xhr.responseText);
		this.children[0].innerHTML = xhr.responseText;
	}.bind(this)
	
}