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refactor: 架构升级
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# uni.previewImage - 预览图片示例
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## 官方文档
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参考官方文档:https://uniapp.dcloud.net.cn/api/media/image.html#previewimage
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## 概述
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`uni.previewImage` 用于预览图片,支持缩放、滑动查看多张图片。
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## 基础用法
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```javascript
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uni.previewImage({
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urls: ['https://example.com/image1.jpg'],
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current: 0
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})
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```
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## 完整示例
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### 示例 1: 预览单张图片
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```javascript
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uni.previewImage({
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urls: ['https://example.com/image1.jpg'],
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current: 'https://example.com/image1.jpg'
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})
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```
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### 示例 2: 预览多张图片
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```javascript
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const imageList = [
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'https://example.com/image1.jpg',
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'https://example.com/image2.jpg',
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'https://example.com/image3.jpg'
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]
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uni.previewImage({
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urls: imageList,
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current: 0 // 从第一张开始
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})
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```
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### 示例 3: 在页面中使用
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```vue
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<template>
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<view class="container">
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<view class="image-list">
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<image
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v-for="(item, index) in imageList"
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:key="index"
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:src="item"
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mode="aspectFill"
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class="image-item"
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@click="previewImage(index)"
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></image>
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</view>
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</view>
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</template>
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<script>
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export default {
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data() {
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return {
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imageList: [
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'https://example.com/image1.jpg',
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'https://example.com/image2.jpg',
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'https://example.com/image3.jpg'
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]
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}
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},
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methods: {
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previewImage(index) {
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uni.previewImage({
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urls: this.imageList,
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current: index
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})
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}
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}
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}
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</script>
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<style>
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.image-list {
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display: flex;
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flex-wrap: wrap;
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}
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.image-item {
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width: 200rpx;
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height: 200rpx;
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margin: 10rpx;
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border-radius: 8rpx;
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}
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</style>
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```
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### 示例 4: 从选择图片到预览
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```vue
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<template>
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<view class="container">
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<button @click="chooseAndPreview">选择并预览图片</button>
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<view class="image-list">
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<image
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v-for="(item, index) in selectedImages"
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:key="index"
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:src="item"
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mode="aspectFill"
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class="image-item"
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@click="previewSelected(index)"
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></image>
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</view>
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</view>
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</template>
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<script>
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export default {
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data() {
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return {
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selectedImages: []
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}
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},
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methods: {
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chooseAndPreview() {
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uni.chooseImage({
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count: 9,
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success: (res) => {
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this.selectedImages = res.tempFilePaths
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// 预览第一张
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if (res.tempFilePaths.length > 0) {
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uni.previewImage({
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urls: res.tempFilePaths,
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current: 0
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})
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}
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}
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})
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},
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previewSelected(index) {
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uni.previewImage({
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urls: this.selectedImages,
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current: index
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})
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}
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}
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}
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</script>
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```
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### 示例 5: 长按保存图片
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```vue
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<template>
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<view class="container">
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<image
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:src="imageUrl"
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mode="aspectFit"
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@longpress="saveImage"
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class="preview-image"
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></image>
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</view>
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</template>
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<script>
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export default {
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data() {
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return {
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imageUrl: 'https://example.com/image.jpg'
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}
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},
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methods: {
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saveImage() {
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uni.showActionSheet({
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itemList: ['保存图片'],
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success: (res) => {
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if (res.tapIndex === 0) {
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uni.downloadFile({
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url: this.imageUrl,
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success: (downloadRes) => {
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uni.saveImageToPhotosAlbum({
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filePath: downloadRes.tempFilePath,
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success: () => {
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uni.showToast({
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title: '保存成功',
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icon: 'success'
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})
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}
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})
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}
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})
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}
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}
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})
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}
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}
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}
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</script>
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```
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## 参数说明
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| 参数名 | 类型 | 必填 | 说明 |
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|--------|------|------|------|
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| urls | Array | 是 | 需要预览的图片 http 链接列表 |
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| current | String/Number | 否 | 当前显示图片的索引或链接 |
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## 平台兼容性
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| 平台 | 支持情况 |
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|------|---------|
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| H5 | ✅ |
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| 微信小程序 | ✅ |
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| 支付宝小程序 | ✅ |
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| 百度小程序 | ✅ |
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| 字节跳动小程序 | ✅ |
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| QQ 小程序 | ✅ |
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| 快手小程序 | ✅ |
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| App | ✅ |
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| 快应用 | ✅ |
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## 注意事项
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1. `urls` 必须是网络图片或已下载的本地路径
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2. `current` 可以是索引(Number)或图片链接(String)
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3. 预览时支持手势缩放和滑动切换
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4. 建议使用网络图片时确保图片可访问
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## 参考资源
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- **官方文档**: https://uniapp.dcloud.net.cn/api/media/image.html#previewimage
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- **选择图片**: https://uniapp.dcloud.net.cn/api/media/image.html#chooseimage
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