(.JS) show_hide_menu on a click

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sample</title>
</head>
<body>
    <p id="demo">hello world</p>
   <button onclick="fun()" id="menu">hide</button>
</body>
<script>
    function fun()
    {
        if(document.getElementById("demo").style.display!="none")
        {
            document.getElementById("demo").style.display="none"
            document.getElementById("menu").innerHTML="show"
        }
        else{
            document.getElementById("demo").style.display="block";
            document.getElementById("menu").innerHTML="hide"
        }
    }
</script>
</html>

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