<div id="d1"><span>d1</span></div>
<div id="d2"><span>d2</span></div>
<input type="button" value="切换" onclick="javascript:switchParent();" />
<script>
function switchParent() {
var d1Content = $("#d1 span");
var d2Content = $("#d2 span");
$("#d2").append(d1Content);
$("#d1").append(d2Content);
}
</script>
