downLoadHandle(src) {
        wx.downloadFile({
            url: src,
            success:function (res) {
                wx.saveImageToPhotosAlbum({
                    filePath: res.tempFilePath,
                    success:function (data) {
                        wx.showToast({
                            title: '保存到相册成功',
                            duration: 500
                        })
                    },
                    fail:function(err) {
                        wx.showToast({
                            icon: 'none',
                            title: '保存到相册失败',
                            duration: 500
                        })
                    }
                })
            },
            fail: function(err) {
                wx.showToast({
                    icon: 'none',
                    title: '保存失败',
                    duration: 500
                })
            }
        })
    }