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html solves the focus event of the current window

零下一度

Apr 21, 2017 pm 06:03 PM

This article is about the html window focus listening event. Let the editor describe it below. Interested friends can take a look at the

code as follows:

<!DOCTYPE html><html><head>
    <meta charset="utf-8">
    <title>使用html5的Page Visibility API来实现</title></head><body><p>
    document.hidden：表示页面是否隐藏的布尔值。页面隐藏包括 页面在后台标签页中 或者 浏览器最小化 （注意，页面被其他软件遮盖并不算隐藏，比如打开的 sublime 遮住了浏览器）。</p><p>
    document.visibilityState：表示下面 4 个可能状态的值</p><p>
    hidden：页面在后台标签页中或者浏览器最小化</p><p>
    visible：页面在前台标签页中</p><p>
    prerender：页面在屏幕外执行预渲染处理 document.hidden 的值为 true</p><p>
    unloaded：页面正在从内存中卸载</p><p>
    Visibilitychange事件：当文档从可见变为不可见或者从不可见变为可见时，会触发该事件。</p></body><script type="text/javascript" src="jquery-3.0.0.min.js"></script><script type="text/javascript">
    var hidden, visibilityChange;    if (typeof document.hidden !== "undefined") {
        hidden = "hidden";
        visibilityChange = "visibilitychange";
    } else if (typeof document.msHidden !== "undefined") {
        hidden = "msHidden";
        visibilityChange = "msvisibilitychange";
    } else if (typeof document.webkitHidden !== "undefined") {
        hidden = "webkitHidden";
        visibilityChange = "webkitvisibilitychange";
    }    function handleVisibilityChange() {
        if (document[hidden]) {
            console.log("失去焦点");
        } else {
            console.log("得到焦点");
        }
    }    // 判断浏览器的支持情况
    if (typeof document.addEventListener === "undefined" || typeof document[hidden] === "undefined") {
        console.log("此演示需要一个浏览器，如谷歌浏览器或Firefox，支持页面可见性API。");
    } else {        // 监听visibilityChange事件
        document.addEventListener(visibilityChange, handleVisibilityChange, false);
    }</script></html>

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<!DOCTYPE html><html><head>
    <meta charset="utf-8">
    <title>使用html5的Page Visibility API来实现</title></head><body><p>
    document.hidden：表示页面是否隐藏的布尔值。页面隐藏包括 页面在后台标签页中 或者 浏览器最小化 （注意，页面被其他软件遮盖并不算隐藏，比如打开的 sublime 遮住了浏览器）。</p><p>
    document.visibilityState：表示下面 4 个可能状态的值</p><p>
    hidden：页面在后台标签页中或者浏览器最小化</p><p>
    visible：页面在前台标签页中</p><p>
    prerender：页面在屏幕外执行预渲染处理 document.hidden 的值为 true</p><p>
    unloaded：页面正在从内存中卸载</p><p>
    Visibilitychange事件：当文档从可见变为不可见或者从不可见变为可见时，会触发该事件。</p></body><script type="text/javascript" src="jquery-3.0.0.min.js"></script><script type="text/javascript">
    var hidden, visibilityChange;    if (typeof document.hidden !== "undefined") {
        hidden = "hidden";
        visibilityChange = "visibilitychange";
    } else if (typeof document.msHidden !== "undefined") {
        hidden = "msHidden";
        visibilityChange = "msvisibilitychange";
    } else if (typeof document.webkitHidden !== "undefined") {
        hidden = "webkitHidden";
        visibilityChange = "webkitvisibilitychange";
    }    function handleVisibilityChange() {
        if (document[hidden]) {
            console.log("失去焦点");
        } else {
            console.log("得到焦点");
        }
    }    // 判断浏览器的支持情况
    if (typeof document.addEventListener === "undefined" || typeof document[hidden] === "undefined") {
        console.log("此演示需要一个浏览器，如谷歌浏览器或Firefox，支持页面可见性API。");
    } else {        // 监听visibilityChange事件
        document.addEventListener(visibilityChange, handleVisibilityChange, false);
    }</script></html>

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