Bunu bir denermisin ?
function cerez_sil(){ var sure = new Date(); sure.setFullYear(sure.getFullYear() - 10); var c = document.cookie.split(";"); for(var i = 0; i < c.length; i++) { if(c[i].indexOf("UPLOAD_COMMIT_LOGIN")>0){ var co = c[i].split("="); console.log(co[0]+"=;expires=" + sure.toGMTString()); document.cookie = co[0]+"=;expires=" + sure.toGMTString(); } } }