Prototype - wrap() 方法
此方法将一个元素包装在另一个元素中,然后返回包装器。
语法
element.wrap(element, wrapper[, attribute]); 或 someElement.wrap(wrapper[, attribute]);
返回值
一个 HTML 元素。
示例
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function showResult() {
$('test').wrap( $("bold") );
}
</script>
</head>
<body>
<p id = "test">Formatted Paragraph</p>
<b id = "bold">Above Paragraph should be wrapped here....<br /></b>
<br />
<input type = "button" value = "Click" onclick = "showResult();"/>
</body>
</html>

prototype_element_object.html