跨浏览器jQuery解决方案!原始可在GitHub

有趣且易于使用!

下面的插件将通过各种版本的IE, Chrome, Firefox, Safari等的标准测试。并相应地建立您所声明的方法。它还涉及以下问题:

onblur | .blur /聚焦事件|。关注“重复”呼叫 通过选择替代应用程序，如word，窗口失去焦点 这往往是不受欢迎的，因为，如果你有一个银行页面打开，它的onblur事件告诉它掩盖页面，然后如果你打开计算器，你不能再看到页面! 不触发页面加载

使用非常简单:向下滚动到“运行代码段”

$.winFocus(function(event, isVisible) {
    console.log("Combo\t\t", event, isVisible);
});

//  OR Pass False boolean, and it will not trigger on load,
//  Instead, it will first trigger on first blur of current tab_window
$.winFocus(function(event, isVisible) {
    console.log("Combo\t\t", event, isVisible);
}, false);

//  OR Establish an object having methods "blur" & "focus", and/or "blurFocus"
//  (yes, you can set all 3, tho blurFocus is the only one with an 'isVisible' param)
$.winFocus({
    blur: function(event) {
        console.log("Blur\t\t", event);
    },
    focus: function(event) {
        console.log("Focus\t\t", event);
    }
});

//  OR First method becoms a "blur", second method becoms "focus"!
$.winFocus(function(event) {
    console.log("Blur\t\t", event);
},
function(event) {
    console.log("Focus\t\t", event);
});

/* Begin Plugin */ ;;(function($){$.winFocus||($.extend({winFocus:function(){var a=!0,b=[];$(document).data("winFocus")||$(document).data("winFocus",$.winFocus.init());for(x in arguments)"object"==typeof arguments[x]?(arguments[x].blur&&$.winFocus.methods.blur.push(arguments[x].blur),arguments[x].focus&&$.winFocus.methods.focus.push(arguments[x].focus),arguments[x].blurFocus&&$.winFocus.methods.blurFocus.push(arguments[x].blurFocus),arguments[x].initRun&&(a=arguments[x].initRun)):"function"==typeof arguments[x]?b.push(arguments[x]): "boolean"==typeof arguments[x]&&(a=arguments[x]);b&&(1==b.length?$.winFocus.methods.blurFocus.push(b[0]):($.winFocus.methods.blur.push(b[0]),$.winFocus.methods.focus.push(b[1])));if(a)$.winFocus.methods.onChange()}}),$.winFocus.init=function(){$.winFocus.props.hidden in document?document.addEventListener("visibilitychange",$.winFocus.methods.onChange):($.winFocus.props.hidden="mozHidden")in document?document.addEventListener("mozvisibilitychange",$.winFocus.methods.onChange):($.winFocus.props.hidden= "webkitHidden")in document?document.addEventListener("webkitvisibilitychange",$.winFocus.methods.onChange):($.winFocus.props.hidden="msHidden")in document?document.addEventListener("msvisibilitychange",$.winFocus.methods.onChange):($.winFocus.props.hidden="onfocusin")in document?document.onfocusin=document.onfocusout=$.winFocus.methods.onChange:window.onpageshow=window.onpagehide=window.onfocus=window.onblur=$.winFocus.methods.onChange;return $.winFocus},$.winFocus.methods={blurFocus:[],blur:[],focus:[], exeCB:function(a){$.winFocus.methods.blurFocus&&$.each($.winFocus.methods.blurFocus,function(b,c){this.apply($.winFocus,[a,!a.hidden])});a.hidden&&$.winFocus.methods.blur&&$.each($.winFocus.methods.blur,function(b,c){this.apply($.winFocus,[a])});!a.hidden&&$.winFocus.methods.focus&&$.each($.winFocus.methods.focus,function(b,c){this.apply($.winFocus,[a])})},onChange:function(a){var b={focus:!1,focusin:!1,pageshow:!1,blur:!0,focusout:!0,pagehide:!0};if(a=a||window.event)a.hidden=a.type in b?b[a.type]: document[$.winFocus.props.hidden],$(window).data("visible",!a.hidden),$.winFocus.methods.exeCB(a);else try{$.winFocus.methods.onChange.call(document,new Event("visibilitychange"))}catch(c){}}},$.winFocus.props={hidden:"hidden"})})(jQuery); /* End Plugin */ // Simple example $(function() { $.winFocus(function(event, isVisible) { $('td tbody').empty(); $.each(event, function(i) { $('td tbody').append( $('<tr />').append( $('<th />', { text: i }), $('<td />', { text: this.toString() }) ) ) }); if (isVisible) $("#isVisible").stop().delay(100).fadeOut('fast', function(e) { $('body').addClass('visible'); $(this).stop().text('TRUE').fadeIn('slow'); }); else { $('body').removeClass('visible'); $("#isVisible").text('FALSE'); } }); }) body { background: #AAF; } table { width: 100%; } table table { border-collapse: collapse; margin: 0 auto; width: auto; } tbody > tr > th { text-align: right; } td { width: 50%; } th, td { padding: .1em .5em; } td th, td td { border: 1px solid; } .visible { background: #FFA; } <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <h3>See Console for Event Object Returned</h3> <table> <tr> <th><p>Is Visible?</p></th> <td><p id="isVisible">TRUE</p></td> </tr> <tr> <td colspan="2"> <table> <thead> <tr> <th colspan="2">Event Data <span style="font-size: .8em;">{ See Console for More Details }</span></th> </tr> </thead> <tbody></tbody> </table> </td> </tr> </table>

发布这个答案是因为我在接受的答案中发现了一个错误。

这个错误是当你在焦点窗口上打开一个开发人员控制台并点击它的任何地方时，开发人员控制台现在有焦点，在这个点窗口。Onfocus或window。Onblur没有任何效果。

这是我的解，

document.addEventListener("visibilitychange", function() {
    if (document.visibilityState === 'visible') {
        console.log('has focus');
    } else {
        console.log('lost focus');
    }
});

阅读更多信息https://developer.mozilla.org/en-US/docs/Web/API/Document/visibilitychange_event

重要编辑:这个答案已经过时了。在编写它之后，引入了可见性API (mdn，示例，规范)。这是解决这个问题更好的办法。

var focused = true;

window.onfocus = function() {
    focused = true;
};
window.onblur = function() {
    focused = false;
};

AFAIK，焦点和模糊都支持…所有东西。(见http://www.quirksmode.org/dom/events/index.html)

是的,窗户。Onfocus和window。Onblur应该适用于你的场景:

http://www.thefutureoftheweb.com/blog/detect-browser-window-focus

在搜索这个问题时，我发现了一个建议，即应该使用Page Visibility API。根据Can I Use: http://caniuse.com/#feat=pagevisibility，大多数现代浏览器都支持此API。

下面是一个工作示例(从这个代码片段派生出来):

$(document).ready(function() {
  var hidden, visibilityState, visibilityChange;

  if (typeof document.hidden !== "undefined") {
    hidden = "hidden", visibilityChange = "visibilitychange", visibilityState = "visibilityState";
  } else if (typeof document.msHidden !== "undefined") {
    hidden = "msHidden", visibilityChange = "msvisibilitychange", visibilityState = "msVisibilityState";
  }

  var document_hidden = document[hidden];

  document.addEventListener(visibilityChange, function() {
    if(document_hidden != document[hidden]) {
      if(document[hidden]) {
        // Document hidden
      } else {
        // Document shown
      }

      document_hidden = document[hidden];
    }
  });
});

更新:上面的例子曾经为Gecko和WebKit浏览器提供前缀属性，但我删除了这个实现，因为这些浏览器已经提供了一段时间没有前缀的页面可见性API。为了与IE10兼容，我保留了微软特有的前缀。

奇怪的是没有人提到document.hasFocus

if (document.hasFocus()) console.log('Tab is active')

MDN有更多信息。