Favorite a clip that closes the browser window and is compatible with various browsers

Especially when important things need to be saved, all browsers are suitable for use:

window.isCloseHint = true;
//Initialize closing
window.addEventListener("beforeunload", function(e) {
if (window.isCloseHint) {
    var confirmationMessage = "Remember to save! Are you sure you want to leave me?";
    (e || window.event).returnValue = confirmationMessage; // Compatible with Gecko + IE
    return confirmationMessage; // Compatible with Gecko + Webkit, Safari, Chrome
}