Hier bitteschön :)
<html>
<head>
<style>
#button {width: 100px; height: 30px; padding: 20px; border-radius: 10px; border: solid 1px purple; background-color: pink;}
.durchgestrichen {text-decoration: line-through;}
</style>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" type="text/javascript"></script>
<script>
$(document).ready(function(){
var b=0;
$('#button').click(function(){
if(b==0){
$('#button').addClass('durchgestrichen');
b=1;
} else {
$('#button').removeClass('durchgestrichen');
b=0;
}
});
});
</script>
</head>
<body>
<h1>Klick den Knopf da drunter:</h1>
<div id="button">
Klick Mich
</div>
</body>
</html>
