使用 Cordova 复制文件

我一直在尝试使用 cordova 将名为 versions.txt 的文件从 applicationDirectory 复制到 externalApplicationStorageDirectory 但代码失败。

这是代码

var path = cordova.file.applicationDirectory + "www/Data/versions.txt";

      window.resolveLocalFileSystemURL(path,
      function gotFile(fileEntry)
      {

          window.requestFileSystem(LocalFileSystem.PERSISTENT, 0,
              function onSuccess(fileSystem)
              { 
                      var directory = new DirectoryEntry("versions.txt", path);

                      fileEntry.copyTo(directory, 'versions.txt',
                          function()
                          {
                              alert('copying was successful')
                          },
                          function()
                          {
                              alert('unsuccessful copying')
                          });

              }, null);
      },null);

有什么帮助吗？

fileEntry.copyTo 不知怎的总是给出错误，所以我尝试了如下的 fileEntry.moveTo ，这对我来说非常适合将任何文件从 www 复制到 iOS 设备的 Library 文件夹中。

function copyToLocation(fileName){       
console.log("Copying :"+fileName);
    window.resolveLocalFileSystemURL(cordova.file.applicationDirectory+"www/"+fileName,function (fileEntry)
    {
        window.resolveLocalFileSystemURL(cordova.file.dataDirectory,function (directory)
        {                  
           fileEntry.moveTo(directory, 'new_fileName.txt',function(){
                alert('Successful Copy!');
            },
            function()
            {
                alert('Copying Unsuccessful ');
            });
        },null);
    }, null);
 }