问Rangy - insertNode IE <9不在插入符号处插入

EN

<!--HTML-->
  <div id="pageFrame" >
    Some text
  </div>
  <br/>
  <input type="button" id="clickNode" value="Insert Node" />
<!--End HTML-->

//Javascript
var theDiv = document.getElementById('pageFrame');
theDiv.contentEditable = true;

document.getElementById('clickNode').onclick = ( function() {
addTheNode();   
});

function addTheNode()
{
 rangy.init();

 var range = rangy.getSelection().getRangeAt(0);

 alert(range);

 var newNode = document.createElement("code");
            newNode.className = "code";         
            newNode.contentEditable = false;
            newNode.innerHTML = "&nbsp";
            range.insertNode(newNode);                      
}
//End Javascript

/*CSS*/

  body { font-family: verdana; font-size:11px;}

  div { border:1px solid #000000; padding:5px; }

  code { display:block; border:1px solid #ff0000 }    

/*End CSS */