<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
</head>
<body>


<div id="11">
    1111
</div>

<div id="22">
    2222
</div>


<script>
    
    
    function insertAfter(new_item, item) {
        item.parentNode.insertBefore(new_item, item.nextSibling);
    }
    
    
    var n = document.createElement('h1');
    n.innerText = '吼吼吼';
    var i = document.getElementById('11');
    insertAfter(n, i);

</script>

</body>
</html>

参考链接：https://zhidao.baidu.com/question/501954189.html