HTML5文件系统API清单文件目录简单示例

Could anyone provide me with a very basic example of how to list the files located in a local directory using the HTML5 FileSystem API? I would like to be able to use an HTML input element of type "file" to select which directory's content is listed off. I tried using the example from the link below, but it did not work (screen was blank and nothing was listed).Could anyone provide me with a very basic examp