Update Node - zTree methods

[ File Path: core/update_fun.html ]

1, Explanation of updateNode
- How to use zTreeObj.updateNode method, please see the API documentation.
- This Demo can only select one parent node
  Try: [ Change Name ] [ Change Icon ]
  [ Change Color ] [ Change Italic Font ]
2, Explanation of setting
- Do not need to set the setting.
- You can modify the node style with setting.view.fontCss.
3, Explanation of treeNode
- In the API documentation has detail description about the 'zTreeObj.updateNode method'.
4、Other explanation
- This demo only made by the core js, so does not include the checkbox update.