tryjsref_document_hasfocus 在线代码实例

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运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p>点击文档任意一处获取焦点，如果点击文档外则会失去焦点。</p>
<p id="demo"></p>
<script>
setInterval("myFunction()", 1);
function myFunction() {
    var x = document.getElementById("demo");
    if (document.hasFocus()) {
        x.innerHTML = "文档已获取焦点。";
    } else {
        x.innerHTML = "文档失去焦点。";
    }
}
</script>
</body>
</html>
 
 
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运行结果
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