【phonegap】下載文件

<!-- 打包的時候phonegap自己會添加這個文件-->
      <script type="text/javascript" charset="utf-8" src="cordova.js"></script>      

      <!-- <script type="text/javascript" charset="utf-8" src="js/FileTransfer.js"></script> -->
      <script type="text/javascript" charset="utf-8">
      // Wait for device API libraries to load    //   
      document.addEventListener("deviceready",onDeviceReady,false);    
      // device APIs are available    //    
      function onDeviceReady() { 
            alert('onDeviceReady2222');
            try {
              /*
            window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
            window.resolveLocalFileSystemURL = window.resolveLocalFileSystemURL                || window.ebkitResolveLocalFileSystemURL; //根據URL取得文件的讀取權限
            */
            
            //查找是否有download這個文件夾，沒有則創建，然后找到這個文件夾的絕對路徑
            window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function (fileSystem) {                
                fileSystem.root.getDirectory("download", {
                    create: true,
                    exclusive: false
                }, function (entry) {
                    //網上流傳的資料中都是使用fullPath，在這里我獲取到的是相對目錄，在下載時使用會報錯，所以換做了toURL()
                    //這是一個全局全局變量，用以保存路徑
                    fullPath = entry.toURL();
                    alert(fullPath.toString() + '創建文件夾成功');
                    //console.log(fullPath);
                }, function () {
                    console.log('創建文件夾失敗');
                    alert('創建文件夾失敗');
                });
            }, function () {
                console.log('創建文件夾失敗');
                alert('創建文件夾失敗');
            });
          }
          catch (e) {
            alert(e.name + ":" + e.message);
          }
        }

function downloadFile() {
        alert(androidFile);
  
        try {
          // onDeviceReady();
          var ft = new FileTransfer();
          var uri = encodeURI(androidFile);
          var fileURL = fullPath + androidFile.substr(androidFile.lastIndexOf('/') + 1);
          alert("准備下載"+fileURL);

          ft.download(
              uri,
              fileURL,
              function(entry) {
                  OpenFile(entry.fullPath);
                  console.log("download complete: " + entry.toURL());
              },
              function(error) {
                  alert("download error source " + error.source);
                  alert("download error target " + error.target);
                  console.log("download error source " + error.source);
                  console.log("download error target " + error.target);
                  console.log("upload error code" + error.code);
              },
              false,
              {
                  headers: {
                      "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
                  }
              }
          );
        }
        catch (e) {
          alert(e.name + ":" + e.message);
        }
      }

<div>                  
                  <a id="androidurl"  href="#" onclick="downloadFile();return false;"><img class="productImg" src="res/android.png" alt="ANDROID" width="80px" height="80px" />Android版</a>
              </div>

 前提是安裝插件：

cordova create my-app

cd my-app

cd plugin

cordova plugin add org.apache.cordova.file-transfer

cordova plugin add org.apache.cordova.file

cordova build android

測試版本是cordova 4.1.2