睡眠定时器的setTimeout失败，单击后退按钮

Question

我有一个睡眠定时器，如果用户的电脑进入睡眠状态超过30秒，它将退出用户。

如果用户点击网站上的后退按钮一次或多次，他们就会被注销，但实际上并不一致。

我知道setTimeout()暂停，然后在用户点击后退按钮时恢复，那么为什么要注销用户呢？

(function ($) {

/**
 * @property {number}     warningTimeout Time (ms) of the countdown until logout.
 * @property {number}     sleepInterval  Interval length in time (ms) to check if the computer went to sleep.
 * @property {function()} logout         Function to redirect user to logout screen.
 * @property {?string}    sleepTimer     Timeout ID of the timer that checks if the computer whent to sleep.
 * @property {?number}    sleepTime      Timestamp of the last time the sleepTimer timeout was executed.
 */
var session = {
    warningTimeout: 30000,  
    sleepInterval: 5000,         
    logout: function () {
        clearTimeout(session.sleepTimer);
        clearTimeout(session.keepaliveTimer);
        $(document).idleTimer('destroy');
        window.location.href = "index.php?q=logout";
    },
    sleepTimer: null,
    sleepTime: Date.now(),
};

/**
 * Logs out user if computer goes to sleep 
 */
session.sleepTimer = setTimeout(function sleeper() {
    var diff = Date.now() - session.sleepTime;
    session.sleepTime = Date.now();

    // If asleep for 30 seconds or more, logout
    if (diff >= session.warningTimeout) {
        session.logout();
    // Synchronize with the start time every run
    } else {
        session.sleepTimer = setTimeout(sleeper, session.sleepInterval - (diff % session.sleepInterval));
    }
}, session.sleepInterval);

})(jQuery);