JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="text_box1" name="text_box1" />
<input type="text" id="text_box2" name="text_box2" />
<br /><br />
<input type="button" id="button1" name="button1" value="Change Text Box 1" onclick="change_text1();" />
<input type="button" id="button2" name="button2" value="Change Text Box 2" onclick="change_text2();" />

JavaScript

function change_text1() {
    document.getElementById('text_box1').value = "Hello";
    document.getElementById('text_box2').value = "";
}
function change_text2() {
    document.getElementById('text_box1').value = "";
    document.getElementById('text_box2').value = "95";
}