要围绕其他两个div创建包装div，请使用wrapAll()方法。您可以尝试运行以下代码以使用jQuery在其他两个div周围创建包装div-
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#button3").click(function(){
$('.demo, .demo2').wrapAll('<div class="demo3">');
});
});
</script>
<style>
div {
background-color: yellow;
}
</style>
</head>
<body>
<div class="demo">
<h2>Heading 2</h2>
<p>This is demo text.</p>
<p>Test</p>
</div>
<div class="demo2">
<h2>Heading 2</h2>
<p>This is demo text.</p>
<p>Test</p>
</div>
<button id="button3">Wrap all</button>
</body>
</html>