<view class="img"  catchlongpress=\'baocun\'></view>

baocun: function (e) {
        wx.showModal({
            title: \'提示\',
            content: \'确定要保存这张图片吗？\',
            success: function (res) {
                if (res.confirm) {
                    console.log(\'用户点击确定\')
                    wx.getImageInfo({
                        src: \'xxxxxxx\',
                        success: function (res) {
                            console.log(res);
                            var path = res.path;
                            wx.saveImageToPhotosAlbum({
                                filePath: path,
                                success: function (res) {
                                    console.log(\'图片已保存\');
                                },
                                fail: function (res) {
                                    console.log(\'保存失败\');
                                }
                            })
                        }
                    });
                } else if (res.cancel) {
                    console.log(\'用户点击取消\')
                }
            }
        })
    },