JSFiddle - React, Tailwind, and code Playground

by JM note

HTML

<div id='greet'>Hello World</div>
<button onclick='btn1_click()'>배경색 변경</button>
<button onclick='btn2_click()'>알림</button>
<script>
function btn1_click() {
    var o = document.getElementById('greet');
    o.style.background = 'red';
}
function btn2_click() {
    alert('안녕');
}
</script>