根据url下载文件

[{"title":"（ 12 个子文件 21KB ） 根据url下载文件","children":[{"title":"testDownloadFile.suo <span style='color:#111;'> 11.00KB </span>","children":null,"spread":false},{"title":"testDownloadFile","children":[{"title":"Program.cs <span style='color:#111;'> 1.67KB </span>","children":null,"spread":false},{"title":"obj","children":[{"title":"Debug","children":[{"title":"testDownloadFile.csproj.FileListAbsolute.txt <span style='color:#111;'> 450B </span>","children":null,"spread":false},{"title":"testDownloadFile.exe <span style='color:#111;'> 5.50KB </span>","children":null,"spread":false},{"title":"TempPE","children":null,"spread":false},{"title":"testDownloadFile.pdb <span style='color:#111;'> 11.50KB </span>","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"bin","children":[{"title":"Debug","children":[{"title":"testDownloadFile.exe <span style='color:#111;'> 5.50KB </span>","children":null,"spread":false},{"title":"testDownloadFile.vshost.exe.manifest <span style='color:#111;'> 490B </span>","children":null,"spread":false},{"title":"testDownloadFile.pdb <span style='color:#111;'> 11.50KB </span>","children":null,"spread":false},{"title":"testDownloadFile.vshost.exe <span style='color:#111;'> 13.99KB </span>","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"Properties","children":[{"title":"AssemblyInfo.cs <span style='color:#111;'> 1.33KB </span>","children":null,"spread":false}],"spread":true},{"title":"testDownloadFile.csproj <span style='color:#111;'> 2.45KB </span>","children":null,"spread":false}],"spread":true},{"title":"testDownloadFile.sln <span style='color:#111;'> 938B </span>","children":null,"spread":false}],"spread":true}]