/// <summary>
        /// 写入
        /// </summary>
        /// <param name="url">文件路径</param>
        /// <param name="data">数据</param>
        /// <param name="onComplete">回调</param>
        /// <returns></returns>
        private IEnumerator SaveByWWW(string url,    
            byte[] data,    
            Action onComplete)
        { 
            if (Application.platform != RuntimePlatform.Android)
                url = "file://" + url;

            WWW www = new WWW(url, data);

            if (www.error != null)
            {
                Debug.LogError("写入配置错误，路径为:" + url);
                yield break;
            }

            while (!www.isDone)
            {
                Debug.Log("uploadProgress:" + www.uploadProgress);//上传进度
                yield return 0;
            }

            onComplete();
            Debug.Log("文件上传成功,路径为:" + url);
        }

请问WWW可不可以用来异步写入文件到本地呢？我这样写直接报错break了。