if (window.attachEvent) {
/*IE and Opera*/
window.attachEvent("onunload", function() {
/* ......?!@# */
});
} else if (document.addEventListener) {
/*Chrome, FireFox*/
window.onbeforeunload = function() {
/* ......?!@# */
};
/*IE 6, Mobile Safari, Chrome Mobile*/
window.addEventListener("unload", function() {
/* ......?!@# */
}, false);
} else {
/*etc*/
document.addEventListener("unload", function() {
/* ......?!@# */
}, false);
}
출 처 : http://plibet.blogspot.kr/2013/09/javascript-unload.html