JS监控浏览器窗口是否活动，最小化操作

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>监控窗口是否活动</title>
</head>
<body>
    <script>
        window.addEventListener('blur', ()=>{
            document.title = '放入后台';
        }, true);

        window.addEventListener('focus', ()=>{
            document.title = '进入页面';
        }, true);
    </script>
</body>
</html>

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