文件传输插件在上传视频和从服务器下载时异步运行

如何解决文件传输插件在上传视频和从服务器下载时异步运行

document.addEventListener（'deviceready'，onDeviceReady，false）;

function onDeviceReady（）{

document.getElementById('uploadVideo').addEventListener("click",onUploadVideo);

// ---------------------------
// Upload Video Code
// ---------------------------

function onUploadVideo() {

    navigator.camera.getPicture(onSuccess,onFail,{ 
        sourceType: Camera.PictureSourceType.SAVEDPHOTOALBUM,mediaType: Camera.MediaType.VIDEO,allowEdit: true
     });
  
     function onSuccess(videoUri) {

      // File Upload
        var options = new FileUploadOptions();
        options.fileKey = "video";
        options.fileName = videoUri.substr(videoUri.lastIndexOf('/') + 1);
        options.mimeType = "video/mp4";
        options.httpMethod  = "POST";
        options.chunkedMode = false; 

        options.headers = {'X-CSRF-Token': localStorage.getItem('u:token')};
        var params = {}; 
        params.value1 = "test";
        params.value2 = "param";
        options.params = params;

        alert("URL of Video is : " + videoUri);
        alert("FileName of Video is : " +  options.fileName);
        alert("FileKey of Video is : " + options.fileKey);
        alert("mimeType is : " + options.mimeType);

        // Give your IP Address and PORT Number
        **var uri = encodeURI("http://192.168.43.130:8081/extractAudio.php");**
        // var uri = encodeURI("http://192.168.1.5:443/uploadvideo.php");
        var ft = new FileTransfer();
        ft.upload(videoUri,uri,function(result){
            alert('successfully uploaded ' + result.response);
          },function(error){
            alert('error : ' + JSON.stringify(error));
          },options);
        
        // ---------------------------
        // Progress Code
        // ---------------------------
        
        var statusDom;
        statusDom = document.getElementById('status');

        ft.onprogress = function(progressEvent) {

            if (progressEvent.lengthComputable) {
                var perc = Math.floor(progressEvent.loaded / progressEvent.total * 100);
                statusDom.innerHTML = perc + "% loaded...";
                console.log(perc);

                } else {
                        if(statusDom.innerHTML == "") {
                        statusDom.innerHTML = "Loading";
                } else {
                        statusDom.innerHTML += ".";
                }

                }
            };

        
        var download_URL = encodeURI("http://192.168.43.130:8081/upload/Dance.mp3");
        // var download_URL = encodeURI("http://192.168.1.5:443/upload/sample.mp3");
        var fileURL =  "*******************";
        // var fileURL =  "********************";

        ft.download(download_URL,fileURL,function(result) {
            alert("download complete: " + result.toURL());
          },function(error) {
            alert("download error source " + error.source);
            alert("download error target " + error.target);
            alert("download error code" + error.code);
          },false,{

            headers: {
               "Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="
            }

         }

      );

    }

     function onFail(message) {
        alert('Failed because: ' + message);
     }

} 

}

// download_URL首先执行，这就是为什么我无法下载sample.mp3文件的原因，因为它不在服务器上。但是，一旦我对相同的文件执行相同的操作，它会下载服务器中已经存在的mp3文件。在完成上传之前，总结它尝试下载的点。我需要先上传，然后再下载mp3文件。有人可以帮我吗？