如何使用javascript(客户端脚本)下载或上传文件

我使用javascript中的以下代码从网络下载或上传文件。

$(document).ready(function DirectoryCopy(sourceDirName, destDirName, copySubDirs, test) {
        debugger;
        try {
            var dir = new System.IO.DirectoryInfo.ctor(sourceDirName);
            var directory_stop = dir.get_Name();
            var dirs = dir.GetDirectories();
            if (!dir.get_Exists()) {
                throw $CreateException(new System.IO.DirectoryNotFoundException.ctor$$String("Source directory does not exist or could not be found: " + sourceDirName), new Error());
            }
            if (!System.IO.Directory.Exists(destDirName)) {
                System.IO.Directory.CreateDirectory$$String(destDirName);
            }
            if (test == true) {
                System.IO.Directory.CreateDirectory$$String(destDirName + "''" + "Complete");
            }
            var files = dir.GetFiles();
            for (var $i2 = 0, $l2 = files.length, file = files[$i2]; $i2 < $l2; $i2++, file = files[$i2]) {
                var temppath = System.IO.Path.Combine$$String$$String(destDirName, file.get_Name());
                file.CopyTo$$String$$Boolean(temppath, true);
            }
            if (copySubDirs) {
                for (var $i3 = 0, $l3 = dirs.length, subdir = dirs[$i3]; $i3 < $l3; $i3++, subdir = dirs[$i3]) {
                    var temppath = System.IO.Path.Combine$$String$$String(destDirName, subdir.get_Name());
                    DirectoryCopy(subdir.get_FullName(), temppath, copySubDirs, false);
                }
                return dirs.length;
            }
            return files.length;
        }
        catch (ex) {
            var path = "d:''tempnew''MyTest.txt";
            var sw = System.IO.File.CreateText(path);
            try {
                sw.WriteLine$$String(ex.toString());
            }
            finally {
                sw.Dispose();
            }
            return 0;
        }
    });

但我在上出错了

 var dir = new System.IO.DirectoryInfo.ctor(sourceDirName);

"系统未定义"

我从代码后面传递值，如下所示。

 TextBox1.Text = @"'" + "''10.66.3.82" + @"'" + "ipadqc" + @"'" + "IPAD Titles" + @"'" + JobName.Text + @"'" + Issue.Text;

    string Macid = (string)(Session["Name"]);
    string path = "D:" + @"'" + "Ipad Download" + @"'" + Macid + @"'" + Process.Text + @"'" + JobName.Text + @"'" + Issue.Text;
    string a;
    ClientScript.RegisterStartupScript(typeof(Page), "script", a = "DirectoryCopy('" + TextBox1.Text + "','"+path+"', true, true);", true);

如果我错了，请纠正我，或者请让我知道是否有更好的选择。