官網：https://uniapp.dcloud.io/api/media/image?id=previewimage

uniapp 實現圖片預覽 單圖預覽和多圖預覽
關鍵點就是呼叫

uni.previewImage({
	current: index,
	urls: photoList
});

如果是單圖預覽，current對應就是0，urls：必須是單個某一條傳入。因為現在預覽一張圖片，你的current傳死就是0.所以urls也必須是字串形式

如果是多圖預覽，current，對應就是在迴圈圖片資料的索引,urls: 是陣列形式傳入。因為uni.previewImage 要根據 current的索引，來動態匹配urls裡面的資料

下面程式碼演示

單圖預覽

previewImg(photoImg) {
	let imgsArray = [];
	imgsArray[0] = photoImg;
	uni.previewImage({
		current: 0,
		urls: imgsArray
	});
}

多圖預覽

<template>
	<view>
		<view>預覽圖片</view>
		<view class="photosView">
			<block v-for="(item, index) in photos" :key="index">
				<view class="box"><image :src="item.src" mode="widthFix" @click="previewImage(index)"></image></view>
			</block>
		</view>
	</view>
</template>

<script>
export default {
	data() {
		return {
			photos: [
				{
					id: '1',
					src:
						'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1592807923709&di=dda3e0b4d055c8dfaaaa9168c570983a&imgtype=0&src=http%3A%2F%2F00.minipic.eastday.com%2F20170331%2F20170331113141_98c8105e504ff71e68d59a6eaa30bd7e_5.jpeg'
				},
				{
					id: '2',
					src:
						'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1592807923711&di=6b8dfec17f7be8213ae23db6e1b7719a&imgtype=0&src=http%3A%2F%2F00.minipic.eastday.com%2F20170509%2F20170509200320_7dacf48b2bcc4b4ab7a0412b333ccb99_6.jpeg'
				},
				{
					id: '3',
					src:
						'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1592807858562&di=262d91cfb1292942a257d17973a4843c&imgtype=0&src=http%3A%2F%2F00.minipic.eastday.com%2F20170303%2F20170303094555_7851ce3d965701f3201d4df2dde56592_8.jpeg'
				},
				{
					id: '4',
					src:
						'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1592807923711&di=61c1d93f123d6039af37727812c64456&imgtype=0&src=http%3A%2F%2F00.minipic.eastday.com%2F20170318%2F20170318103604_eea6fa2eab8da83f770158463b7201f7_2.jpeg'
				}
			]
		};
	},
	methods: {
		previewImage(index) {
			let photoList = this.photos.map(item => {
				return item.src;
			});
			uni.previewImage({
				current: index,
				urls: photoList
			});
		}
	}
};
</script>

<style scoped lang="less">
* {
	margin: 0;
	padding: 0;
}
.photosView {
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
	.box {
		width: 30%;
		image {
			width: 100%;
			height: 100%;
		}
	}
}
</style>