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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</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>
|
