<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.image{width:960px;height:640px}
.buton{background-color:aquamarine;color:black;width:120px;height:60px;font-size:32px}
</style>
<script>
var durum=0,div=document.getElementById("div_acip_kapama");
function div_acip_kapama(){
if (durum==0){
document.getElementById("div").style.display = "block";
durum=1;
} else {
document.getElementById("div").style.display = "none";
durum=0;
}
}
</script>
</head>
<body>
<div id="div" style="display:none">Div İçeriği</div>
<button type="button" class="buton" onclick="div_acip_kapama()" id="butoon">Buton !</button>
</body>
</html>