JSFiddle - React, Tailwind, and code Playground
HTML
<a href="#" onclick="var var1 = '1'; myfunc(var1);">1</a>
<a href="#" onclick="var var2 = '2'; myfunc(var2);">2</a>
<a href="#" onclick="var var3 = '3'; myfunc(var3);">3</a>
<a href="#" onclick="var var4 = '4'; myfunc(var4);">4</a>
<script>
function myfunc(arg) {
alert(arg);
}
</script>