uniapp 在APP端下载保存图片到根目录下文件夹内

checkImageExist() {

    uni.showLoading({

        mask: true,

    })

    let url = ‘图片地址’

    uni.getImageInfo({

        src: url,

        complete: function(image) {

            if (image.errMsg == ‘getImageInfo:ok’) {

                this.downloadTaskFn();

            }

        }

    })

},

downloadTaskFn() {

    let url = ‘图片地址’

    let downloadTask = plus.downloader.createDownload(url, {

        timeout: 0, //下载任务超时时间，如果设置为0则表示永远不超时

        filename: ‘file://storage/emulated/0/文件夹名称/’

    }, (d, status) => {

        uni.hideLoading()

    })

    downloadTask.start();

}