打开文件选择窗口

方法名称：open_files

示例代码(JavaScript)

    , openFiles: function ()

    {

        var param = { name: "open_files" };

        this.postMessage(param);

    }

示例代码（C#）

static void up6_test()

{

    HttpUploaderAppLib.HttpPartitionClass part = new HttpUploaderAppLib.HttpPartitionClass();

    JObject o = new JObject();

    o["name"] = "open_files";

    part.postMessage(o.ToString());

}

此方法会触发事件open_files