这适用于所有现代浏览器:

更改制表符时 更改窗口时(Alt+Tab) 当从任务栏最大化另一个程序时

var eventName;
var visible = true;
var propName = "hidden";
if (propName in document) eventName = "visibilitychange";
else if ((propName = "msHidden") in document) eventName = "msvisibilitychange";
else if ((propName = "mozHidden") in document) eventName = "mozvisibilitychange";
else if ((propName = "webkitHidden") in document) eventName = "webkitvisibilitychange";
if (eventName) document.addEventListener(eventName, handleChange);

if ("onfocusin" in document) document.onfocusin = document.onfocusout = handleChange; //IE 9
window.onpageshow = window.onpagehide = window.onfocus = window.onblur = handleChange;// Changing tab with alt+tab

// Initialize state if Page Visibility API is supported
if (document[propName] !== undefined) handleChange({ type: document[propName] ? "blur" : "focus" });

function handleChange(evt) {
  evt = evt || window.event;
  if (visible && (["blur", "focusout", "pagehide"].includes(evt.type) || (this && this[propName]))){
    visible = false;
    console.log("Out...")
  }
  else if (!visible && (["focus", "focusin", "pageshow"].includes(evt.type) || (this && !this[propName]))){
    visible = true;
    console.log("In...")
  }
}

我重读了@daniel-buckmaster的版本 我没有做多次尝试，但是，代码对我来说似乎更优雅…

// on-visibility-change.js v1.0.1, based on https://stackoverflow.com/questions/1060008/is-there-a-way-to-detect-if-a-browser-window-is-not-currently-active#38710376
function onVisibilityChange(callback) {
    let d = document;
    let visible = true;
    let prefix;
    if ('hidden' in d) {
        prefix = 'h';
    } else if ('webkitHidden' in d) {
        prefix = 'webkitH';
    } else if ('mozHidden' in d) {
        prefix = 'mozH';
    } else if ('msHidden' in d) {
        prefix = 'msH';
    } else if ('onfocusin' in d) { // ie 9 and lower
        d.onfocusin = focused;
        d.onfocusout = unfocused;
    } else { // others
        window.onpageshow = window.onfocus = focused;
        window.onpagehide = window.onblur = unfocused;
    };
    if (prefix) {
        visible = !d[prefix + 'idden'];
        d.addEventListener(prefix.substring(0, prefix.length - 1) + 'visibilitychange', function() {
            (d[prefix + 'idden'] ? unfocused : focused)();
        });
    };

    function focused() {
        if (!visible) {
            callback(visible = true);
        };
    };

    function unfocused() {
        if (visible) {
            callback(visible = false);
        };
    };
};

使用:页面可见性API

document.addEventListener( 'visibilitychange' , function() {
    if (document.hidden) {
        console.log('bye');
    } else {
        console.log('well back');
    }
}, false );

我能用吗?http://caniuse.com/#feat=pagevisibility

U可以使用:

(function () {

    var requiredResolution = 10; // ms
    var checkInterval = 1000; // ms
    var tolerance = 20; // percent


    var counter = 0;
    var expected = checkInterval / requiredResolution;
    //console.log('expected:', expected);

    window.setInterval(function () {
        counter++;
    }, requiredResolution);

    window.setInterval(function () {
        var deviation = 100 * Math.abs(1 - counter / expected);
        // console.log('is:', counter, '(off by', deviation , '%)');
        if (deviation > tolerance) {
            console.warn('Timer resolution not sufficient!');
        }
        counter = 0;
    }, checkInterval);

})();

在HTML 5中，你也可以使用:

onpageshow:当窗口变得可见时运行的脚本 onpagehide:当窗口隐藏时运行的脚本

See:

https://developer.mozilla.org/en-US/docs/Web/Events/pageshow https://developer.mozilla.org/en-US/docs/Web/Events/pagehide

这在chrome 67和firefox 67上都适用，

if(!document.hasFocus()) {
    // do stuff
}