改进Equiman(原始)的答案:

function idleLogout() {
    var t;
    window.onload = resetTimer;
    window.onmousemove = resetTimer;
    window.onmousedown = resetTimer;  // catches touchscreen presses as well      
    window.ontouchstart = resetTimer; // catches touchscreen swipes as well      
    window.ontouchmove = resetTimer;  // required by some devices 
    window.onclick = resetTimer;      // catches touchpad clicks as well
    window.onkeydown = resetTimer;   
    window.addEventListener('scroll', resetTimer, true); // improved; see comments

    function yourFunction() {
        // your function for too long inactivity goes here
        // e.g. window.location.href = 'logout.php';
    }

    function resetTimer() {
        clearTimeout(t);
        t = setTimeout(yourFunction, 10000);  // time is in milliseconds
    }
}
idleLogout();

除了活动检测方面的改进，以及从文档到窗口的更改之外，这个脚本实际上调用了函数，而不是让它闲置着。

它不会直接捕获零CPU使用情况，但这是不可能的，因为执行函数会导致CPU使用。用户不活动最终导致CPU使用率为零，因此它间接地捕捉到CPU使用率为零。

类似于Peter J的解决方案(使用jQuery自定义事件)…

// Use the jquery-idle-detect.js script below
$(window).on('idle:start', function() {
  // Start your prefetch, etc. here...
});

$(window).on('idle:stop', function() {
  // Stop your prefetch, etc. here...
});

文件jquery-idle-detect.js

(function($, $w) {
  // Expose configuration option
  // Idle is triggered when no events for 2 seconds
  $.idleTimeout = 2000;

  // Currently in idle state
  var idle = false;

  // Handle to idle timer for detection
  var idleTimer = null;

  // Start the idle timer and bind events on load (not DOM-ready)
  $w.on('load', function() {
    startIdleTimer();
    $w.on('focus resize mousemove keyup', startIdleTimer)
      .on('blur', idleStart) // Force idle when in a different tab/window
      ;
  ]);

  function startIdleTimer() {
    clearTimeout(idleTimer); // Clear prior timer

    if (idle) $w.trigger('idle:stop'); // If idle, send stop event
    idle = false; // Not idle

    var timeout = ~~$.idleTimeout; // Option to integer
    if (timeout <= 100)
      timeout = 100; // Minimum 100 ms
    if (timeout > 300000)
      timeout = 300000; // Maximum 5 minutes

    idleTimer = setTimeout(idleStart, timeout); // New timer
  }

  function idleStart() {
    if (!idle)
      $w.trigger('idle:start');
    idle = true;
  }

}(window.jQuery, window.jQuery(window)))

试试这段代码。它工作得很完美。

var IDLE_TIMEOUT = 10; //seconds
var _idleSecondsCounter = 0;

document.onclick = function () {
    _idleSecondsCounter = 0;
};

document.onmousemove = function () {
    _idleSecondsCounter = 0;
};

document.onkeypress = function () {
    _idleSecondsCounter = 0;
};

window.setInterval(CheckIdleTime, 1000);

function CheckIdleTime() {
    _idleSecondsCounter++;
    var oPanel = document.getElementById("SecondsUntilExpire");
    if (oPanel)
        oPanel.innerHTML = (IDLE_TIMEOUT - _idleSecondsCounter) + "";
    if (_idleSecondsCounter >= IDLE_TIMEOUT) {
        alert("Time expired!");
        document.location.href = "SessionExpired.aspx";
    }
}

我使用这种方法，因为您不需要在事件触发时不断重置时间。相反，我们只记录时间，这将生成空闲的起始点。

function idle(WAIT_FOR_MINS, cb_isIdle) {
    var self = this,
        idle,
        ms = (WAIT_FOR_MINS || 1) * 60000,
        lastDigest = new Date(),
        watch;
    //document.onmousemove = digest;
    document.onkeypress = digest;
    document.onclick = digest;

    function digest() {
       lastDigest = new Date();
    }

    // 1000 milisec = 1 sec
    watch = setInterval(function() {
        if (new Date() - lastDigest > ms && cb_isIdel) {
            clearInterval(watch);
            cb_isIdle();
        }

    }, 1000*60);
},

您可以在文档主体上附加一个单击或鼠标移动事件，以重置计时器。

有一个函数，你在定时间隔调用，检查定时器是否超过指定的时间(如1000毫秒)，并开始你的预加载。

你可以用Underscore.js和jQuery更优雅地做到这一点:

$('body').on("click mousemove keyup", _.debounce(function(){
    // do preload here
}, 1200000)) // 20 minutes debounce