code: function (doc, node) {
          var tmpNode = browser.ie ? doc.createTextNode(domUtils.fillChar) : doc.createElement('br');
          node.innerHTML = '';
          node.appendChild(tmpNode);
      }
docs: 用“填充字符”填充节点
  @method fillNode
  @private
  @param { DomDocument } doc 填充的节点所在的docment对象
  @param { Node } node 需要填充的节点对象
  @example
  ```html
  <div id="test"></div>
  
  <script>
  var testNode = document.getElementById("test");
  
  //output: 0
  console.log( testNode.childNodes.length );
  
  UE.dom.domUtils.fillNode( document, testNode );
  
  //output: 1
  console.log( testNode.childNodes.length );
  
  </script>
  ```