JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block1">Кнопка 1</div>
<div id="label1">Поле 1</div>
<div id="block2">Кнопка 2</div>
<div id="label2">Поле 2</div>
<div id="str"></div>

CSS

.label1 {
	display: block;
}
.label2 {
	display: block;
}

JavaScript

var vis = 1;
block1.onclick = function() {
		if(vis === 1){
    		document.getElementById('label1').style.display='none';
        vis = 0;
    } else {
    		document.getElementById('label1').style.display='block';
        vis = 1;
    }
};