html5 plus 图片下载保存到手机相册

$( ".download"). click( function(){

                 var self = plus. webview. currentWebview();

                 console. log( self. fileUrl)

                 plus. nativeUI. showWaiting( '加载中...')

                 var dtask = plus. downloader. createDownload( self. fileUrl, {}, function ( d, status ) {

                     // 下载完成

                     if ( status == 200 ) {

//                      mui.toast("下载成功,文件保存在"+d.filename)

                         plus. gallery. save( d. filename, function() { //保存到相册方法

                             plus. nativeUI. closeWaiting()

                             mui. toast( '已保存到手机相册');

                        }, function() {

                             plus. nativeUI. closeWaiting()

                             mui. toast( '保存失败，请重试！');

                        });

                    } else {

                         mui. toast( "下载失败")

                    }

                });

                 dtask. start();

            })