JSFiddle - React, Tailwind, and code Playground

HTML

<button id="id1" >Button1</button>
<button id="id2" >Button2</button>
<script>
    
buttons = document.getElementsByTagName("button");
for( var x=0; x < buttons.length; x++ ) {
    buttons[x].onclick = handleclick;
}
    
function handleclick()
{
    alert(this.id); //here is your id
} 
</script>