Page({ download() { my.downloadFile({ url: 'http://img.alicdn.com/tfs/TB1x669SXXXXXbdaFXXXXXXXXXX-520-280.jpg', success({ apFilePath }) { my.previewImage({ urls: [apFilePath], }); }, fail(res) { my.alert({ content: res.errorMessage || res.error, }); }, }); }, })