如何判断当前窗口是否激活

http://stackoverflow.com/questions/1060008/is-there-a-way-to-detect-if-a-browser-window-is-not-currently-active

Current browser support:

Chrome 13
Internet Explorer 10
Firefox 10
Opera 12.10 [read notes]
The following code makes use of the API, falling back to the less reliable blur/focus method in incompatible browsers.

(function() {
    var hidden = "hidden";

    // Standards:
    if (hidden in document)
        document.addEventListener("visibilitychange", onchange);
    else if ((hidden = "mozHidden") in document)
        document.addEventListener("mozvisibilitychange", onchange);
    else if ((hidden = "webkitHidden") in document)
        document.addEventListener("webkitvisibilitychange", onchange);
    else if ((hidden = "msHidden") in document)
        document.addEventListener("msvisibilitychange", onchange);
    // IE 9 and lower:
    else if ('onfocusin' in document)
        document.onfocusin = document.onfocusout = onchange;
    // All others:
    else
        window.onpageshow = window.onpagehide 
            = window.onfocus = window.onblur = onchange;

    function onchange (evt) {
        var v = 'visible', h = 'hidden',
            evtMap = { 
                focus:v, focusin:v, pageshow:v, blur:h, focusout:h, pagehide:h 
            };

        evt = evt || window.event;
        if (evt.type in evtMap)
            document.body.className = evtMap[evt.type];
        else        
            document.body.className = this[hidden] ? "hidden" : "visible";
    }
})();

也可以监听鼠标移动事件，若移动则说明在当前窗口。若超过几分钟没动，则说明可能不在当前状态。但是性能上来说肯定是前一种方案更好。