complete 回调 ok， 无失败回调 ， 图片是网络图片

let imgUrl = 'https://cdn.120askimages.com/picc/20208/thumb/thumb_20200827145842137.jpg';
				let src = imgUrl;//获取data-src
				let imgList = [imgUrl];//获取data-list
wx.previewImage({
					current:src,
					urls: imgList,
					success: (res) => {
						console.log(JSON.stringify(res));
					},
					fail: (res) => {
						console.log(JSON.stringify(res));
					},
					complete: (res) => {
						console.log(JSON.stringify(res));
					}
				});