<!DOCTYPE html>
<html>
<body>
<button name="submit" type="button" onclick="fonksiyon()">E-Posta Ekle</button>
<textarea name="yazi" id="yazi"></textarea>
<script>
function fonksiyon() {
document.getElementById("yazi").value+= "{eposta}";
}
</script>
</body>
</html> 
