index.html
type <!DOCTYPE html>
<html>
<head>`your text`
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<title>Page Title</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<script src='main.js'></script>
</head>
<body>
<img src="twitter.jpg" id="tv">
<button id="btn" >OK</button>
</body>
</html>here
main.js
$("#btn").on("click",function (){ $('#tv').hide(); })
When I click on button nothing happens
when I write a special function in main.js and call it from index.html, it works