javascript - 有没有办法检测用户是否在 beforeunload 事件中按下了 "Stay on page"或 "Leave page"？

Question

有什么方法可以让我在以下代码中检测到用户点击了“离开页面”或“留在页面”按钮？

$(window).on('beforeunload', function (){
    return "You save some unsaved data, Do you want to leave?";
});

Answer 1

通过一些技巧，您至少可以确定用户是否留下来了。
如果用户离开了页面，您对此无能为力:

var timeout;

$(window).on('beforeunload', function (){
    timeout = setTimeout(function() {
        // user stayed, do stuff here
    }, 1000);
    return "You save some unsaved data, Do you want to leave?";
});

FIDDLE