u-upload 预览视频问题

## bug所属区域（vue页面，nvue页面，文档）

u-upload
## 简单描述

onPreviewVideo 这个方法明明写了，却没有调用
这是我修改后的代码，可以支持视频预览

## 问题截图

```
<template>
	<view class="u-upload" :style="[$u.addStyle(customStyle)]">
		<view class="u-upload__wrap" >
			<template v-if="previewImage">
				<view
				    class="u-upload__wrap__preview"
				    v-for="(item, index) in lists"
				    :key="index"
				>
					<image
					    v-if="item.isImage || (item.type && item.type === 'image')"
					    :src="item.thumb || item.url"
					    :mode="imageMode"
					    class="u-upload__wrap__preview__image"
					    @tap="onPreviewImage(item)"
						:style="[{
							width: $u.addUnit(width),
							height: $u.addUnit(height)
						}]"
					/>
					<view
					    v-else-if="item.isVideo || (item.type && item.type === 'video')"
					    class="u-upload__wrap__preview__other"
					    @tap="onPreviewVideo(item, index)"
					>
						<u-icon
						    color="#80CBF9"
						    size="26"
						    name="movie"
						></u-icon>
						<text class="u-upload__wrap__preview__other__text">视频</text>
					</view>
					<view
					    v-else
					    class="u-upload__wrap__preview__other"
					>
						<u-icon
						    color="#80CBF9"
						    size="26"
						    name="folder"
						></u-icon>
						<text class="u-upload__wrap__preview__other__text">文件</text>
					</view>
					<view
					    class="u-upload__status"
					    v-if="item.status === 'uploading' || item.status === 'failed'"
					>
						<view class="u-upload__status__icon">
							<u-icon
							    v-if="item.status === 'failed'"
							    name="close-circle"
							    color="#ffffff"
							    size="25"
							/>
							<u-loading-icon
							    size="22"
							    mode="circle"
							    color="#ffffff"
							    v-else
							/>
						</view>
						<text
						    v-if="item.message"
						    class="u-upload__status__message"
						>{{ item.message }}</text>
					</view>
					<view
					    class="u-upload__deletable"
					    v-if="item.status !== 'uploading' && (deletable || item.deletable)"
					    @tap.stop="deleteItem(index)"
					>
						<view class="u-upload__deletable__icon">
							<u-icon
							    name="close"
							    color="#ffffff"
							    size="10"
							></u-icon>
						</view>
					</view>
					<view
					    class="u-upload__success"
					    v-if="item.status === 'success'"
					>
						
						<image
						    :src="successIcon"
						    class="u-upload__success__icon"
						></image>
						
						
						<view class="u-upload__success__icon">
							<u-icon
							    name="checkmark"
							    color="#ffffff"
							    size="12"
							></u-icon>
						</view>
						
					</view>
				</view>
				
			</template>
			
			<template v-if="isInCount">
				<view
				    v-if="$slots.default || $slots.$default"
				    @tap="chooseFile"
				>
					<slot />
				</view>
				<view
				    v-else
				    class="u-upload__button"
				    :hover-class="!disabled ? 'u-upload__button--hover' : ''"
				    hover-stay-time="150"
				    @tap="chooseFile"
				    :class="[disabled && 'u-upload__button--disabled']"
					:style="[{
						width: $u.addUnit(width),
						height: $u.addUnit(height)
					}]"
				>
					<u-icon
					    :name="uploadIcon"
					    size="26"
					    :color="uploadIconColor"
					></u-icon>
					<text
					    v-if="uploadText"
					    class="u-upload__button__text"
					>{{ uploadText }}</text>
				</view>
			</template>
		</view>

</view>
</template>

/**
	 * upload 上传
	 * @description 该组件用于上传图片场景
	 * @tutorial https://uviewui.com/components/upload.html
	 * @property {String}			accept				接受的文件类型, 可选值为all media image file video （默认 'image' ）
	 * @property {String | Array}	capture				图片或视频拾取模式，当accept为image类型时设置capture可选额外camera可以直接调起摄像头（默认 ['album', 'camera'] ）
	 * @property {Boolean}			compressed			当accept为video时生效，是否压缩视频，默认为true（默认 true ）
	 * @property {String}			camera				当accept为video时生效，可选值为back或front（默认 'back' ）
	 * @property {Number}			maxDuration			当accept为video时生效，拍摄视频最长拍摄时间，单位秒（默认 60 ）
	 * @property {String}			uploadIcon			上传区域的图标，只能内置图标（默认 'camera-fill' ）
	 * @property {String}			uploadIconColor		上传区域的图标的字体颜色，只能内置图标（默认 #D3D4D6 ）
	 * @property {Boolean}			useBeforeRead		是否开启文件读取前事件（默认 false ）
	 * @property {Boolean}			previewFullImage	是否显示组件自带的图片预览功能（默认 true ）
	 * @property {String | Number}	maxCount			最大上传数量（默认 52 ）
	 * @property {Boolean}			disabled			是否启用（默认 false ）
	 * @property {String}			imageMode			预览上传的图片时的裁剪模式，和image组件mode属性一致（默认 'aspectFill' ）
	 * @property {String}			name				标识符，可以在回调函数的第二项参数中获取
	 * @property {Array}			sizeType			所选的图片的尺寸, 可选值为original compressed（默认 ['original', 'compressed'] ）
	 * @property {Boolean}			multiple			是否开启图片多选，部分安卓机型不支持 （默认 false ）
	 * @property {Boolean}			deletable			是否展示删除按钮（默认 true ）
	 * @property {String | Number}	maxSize				文件大小限制，单位为byte （默认 Number.MAX_VALUE ）
	 * @property {Array}			fileList			显示已上传的文件列表
	 * @property {String}			uploadText			上传区域的提示文字
	 * @property {String | Number}	width				内部预览图片区域和选择图片按钮的区域宽度（默认 80 ）
	 * @property {String | Number}	height				内部预览图片区域和选择图片按钮的区域高度（默认 80 ）
	 * @property {Object}			customStyle			组件的样式，对象形式
	 * @event {Function} afterRead		读取后的处理函数
	 * @event {Function} beforeRead		读取前的处理函数
	 * @event {Function} oversize		文件超出大小限制
	 * @event {Function} clickPreview	点击预览图片
	 * @event {Function} delete 		删除图片
	 * @example <u-upload :action="action" :fileList="fileList" ></u-upload>
	 */
	export default {
		name: "u-upload",
		mixins: [uni.$u.mpMixin, uni.$u.mixin, mixin,props],
		data() {
			return {
				// #ifdef APP-NVUE
				successIcon: 'data:image/png;base64,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',
				// #endif
				lists: [],
				isInCount: true,
			}
		},
		watch: {
			// 监听文件列表的变化，重新整理内部数据
			fileList: {
				immediate: true,
				handler() {
					this.formatFileList()
				}
			},
		},
		methods: {
			formatFileList() {
				const {
					fileList = [], maxCount
				} = this;
				const lists = fileList.map((item) =>
					Object.assign(Object.assign({}, item), {
						// 如果item.url为本地选择的blob文件的话，无法判断其为video还是image，此处优先通过accept做判断处理
						isImage: this.accept === 'image' || uni.$u.test.image(item.url || item.thumb),
						isVideo: this.accept === 'video' || uni.$u.test.video(item.url || item.thumb),
						deletable: typeof(item.deletable) === 'boolean' ? item.deletable : this.deletable,
					})
				);
				this.lists = lists
				this.isInCount = lists.length < maxCount
			},
			chooseFile() {
				const {
					maxCount,
					multiple,
					lists,
					disabled
				} = this;
				if (disabled) return;
				// 如果用户传入的是字符串，需要格式化成数组
				let capture;
				try {
					capture = uni.$u.test.array(this.capture) ? this.capture : this.capture.split(',');
				}catch(e) {
					capture = [];
				}
				chooseFile(
						Object.assign({
							accept: this.accept,
							multiple: this.multiple,
							capture: capture,
							compressed: this.compressed,
							maxDuration: this.maxDuration,
							sizeType: this.sizeType,
							camera: this.camera,
						}, {
							maxCount: maxCount - lists.length,
						})
					)
					.then((res) => {
						this.onBeforeRead(multiple ? res : res[0]);
					})
					.catch((error) => {
						this.$emit('error', error);
					});
			},
			// 文件读取之前
			onBeforeRead(file) {
				const {
					beforeRead,
					useBeforeRead,
				} = this;
				let res = true
				// beforeRead是否为一个方法
				if (uni.$u.test.func(beforeRead)) {
					// 如果用户定义了此方法，则去执行此方法，并传入读取的文件回调
					res = beforeRead(file, this.getDetail());
				}
				if (useBeforeRead) {
					res = new Promise((resolve, reject) => {
						this.$emit(
							'beforeRead',
							Object.assign(Object.assign({
								file
							}, this.getDetail()), {
								callback: (ok) => {
									ok ? resolve() : reject();
								},
							})
						);
					});
				}
				if (!res) {
					return;
				}
				if (uni.$u.test.promise(res)) {
					res.then((data) => this.onAfterRead(data || file));
				} else {
					this.onAfterRead(file);
				}
			},
			getDetail(index) {
				return {
					name: this.name,
					index: index == null ? this.fileList.length : index,
				};
			},
			onAfterRead(file) {
				const {
					maxSize,
					afterRead
				} = this;
				const oversize = Array.isArray(file) ?
					file.some((item) => item.size > maxSize) :
					file.size > maxSize;
				if (oversize) {
					this.$emit('oversize', Object.assign({
						file
					}, this.getDetail()));
					return;
				}
				if (typeof afterRead === 'function') {
					afterRead(file, this.getDetail());
				}
				this.$emit('afterRead', Object.assign({
					file
				}, this.getDetail()));
			},
			deleteItem(index) {
				this.$emit(
					'delete',
					Object.assign(Object.assign({}, this.getDetail(index)), {
						file: this.fileList[index],
					})
				);
			},
			// 预览图片
			onPreviewImage(item) {
				if (!item.isImage || !this.previewFullImage) return
				uni.previewImage({
					// 先filter找出为图片的item，再返回filter结果中的图片url
					urls: this.lists.filter((item) => this.accept === 'image' || uni.$u.test.image(item.url || item.thumb)).map((item) => item.url || item.thumb),
					current: item.url || item.thumb,
					fail() {
						uni.$u.toast('预览图片失败')
					},
				});
			},
			onPreviewVideo(item, index) {
				if (!this.previewFullImage) return;
				
				// 定义 isVideoFile 函数
				const isVideoFile = (item) => {
					return item.isVideo || (item.type && item.type === 'video') || uni.$u.test.video(item.url || item.thumb);
				};
				
				// #ifdef MP-WEIXIN
				// 微信小程序使用wx.previewMedia
				const videoList = this.lists
					.filter((item) => isVideoFile(item))
					.map((item) => ({
						...item,
						type: 'video'
					}));
				
				wx.previewMedia({
					sources: videoList,
					current: index,
					fail() {
						uni.$u.toast('预览视频失败')
					},
				});
				// #endif
				
				// #ifndef MP-WEIXIN
				// 其他平台直接使用uni.previewImage类似的API
				// 或者可以跳转到专门的视频播放页面
				uni.showToast({
					title: '视频预览功能仅支持微信小程序',
					icon: 'none'
				});
				// #endif
				
				// 触发点击预览事件
				this.$emit(
					'clickPreview',
					Object.assign(Object.assign({}, item), this.getDetail(index))
				);
			},
			onClickPreview(event) {
				const {
					index
				} = event.currentTarget.dataset;
				const item = this.data.lists[index];
				this.$emit(
					'clickPreview',
					Object.assign(Object.assign({}, item), this.getDetail(index))
				);
			}
		}
	}
</script>

.u-upload {
		@include flex(column);
		flex: 1;

&__wrap {
			@include flex;
			flex-wrap: wrap;
			flex: 1;

&__preview {
				border-radius: $u-upload-preview-border-radius;
				margin: $u-upload-preview-margin;
				position: relative;
				overflow: hidden;
				@include flex;

&__image {
					width: $u-upload-image-width;
					height: $u-upload-image-height;
				}

&__other {
					width: $u-upload-image-width;
					height: $u-upload-image-height;
					background-color: $u-upload-other-bgColor;
					flex: $u-upload-other-flex;
					@include flex(column);
					justify-content: center;
					align-items: center;

&__text {
						font-size: $u-upload-text-font-size;
						color: $u-upload-text-color;
						margin-top: $u-upload-text-margin-top;
					}
				}
			}
		}

&__deletable {
			position: absolute;
			top: $u-upload-deletable-top;
			right: $u-upload-deletable-right;
			background-color: $u-upload-deletable-bgColor;
			height: $u-upload-deletable-height;
			width: $u-upload-deletable-width;
			@include flex;
			border-bottom-left-radius: $u-upload-deletable-boder-bottom-left-radius;
			align-items: center;
			justify-content: center;
			z-index: $u-upload-deletable-zIndex;

&__icon {
				position: absolute;
				transform: scale(0.7);
				top: $u-upload-icon-top;
				right: $u-upload-icon-right;
				/* #ifdef H5 */
				top: $u-upload-icon-h5-top;
				right: $u-upload-icon-h5-right;
				/* #endif */
			}
		}

&__success {
			position: absolute;
			bottom: $u-upload-success-bottom;
			right: $u-upload-success-right;
			@include flex;
			// 由于weex(nvue)为阿里巴巴的KPI(部门业绩考核)的laji产物，不支持css绘制三角形
			// 所以在nvue下使用图片，非nvue下使用css实现
			/* #ifndef APP-NVUE */
			border-style: $u-upload-success-border-style;
			border-top-color: $u-upload-success-border-top-color;
			border-left-color: $u-upload-success-border-left-color;
			border-bottom-color: $u-upload-success-border-bottom-color;
			border-right-color: $u-upload-success-border-right-color;
			border-width: $u-upload-success-border-width;
			align-items: center;
			justify-content: center;
			/* #endif */

&__icon {
				/* #ifndef APP-NVUE */
				position: absolute;
				transform: scale(0.7);
				bottom: $u-upload-success-icon-bottom;
				right: $u-upload-success-icon-right;
				/* #endif */
				/* #ifdef APP-NVUE */
				width: $u-upload-icon-width;
				height: $u-upload-icon-height;
				/* #endif */
			}
		}

&__status {
			position: absolute;
			top: $u-upload-status-top;
			bottom: $u-upload-status-bottom;
			left: $u-upload-status-left;
			right: $u-upload-status-right;
			background-color: $u-upload-status-bgColor;
			@include flex(column);
			align-items: center;
			justify-content: center;

&__icon {
				position: relative;
				z-index: $u-upload-status-icon-Zindex;
			}

&__message {
				font-size: $u-upload-message-font-size;
				color: $u-upload-message-color;
				margin-top: $u-upload-message-margin-top;
			}
		}

&__button {
			@include flex(column);
			align-items: center;
			justify-content: center;
			width: $u-upload-button-width;
			height: $u-upload-button-height;
			background-color: $u-upload-button-bgColor;
			border-radius: $u-upload-button-border-radius;
			margin: $u-upload-botton-margin;
			/* #ifndef APP-NVUE */
			box-sizing: border-box;
			/* #endif */

&__text {
				font-size: $u-upload-text-font-size;
				color: $u-upload-text-color;
				margin-top: $u-upload-text-margin-top;
			}

&--hover {
				background-color: $u-upload-hover-bgColor;
			}

&--disabled {
				opacity: $u-upload-disabled-opacity;
			}
		}
	}
</style>

```

## 代码示例
 修改后的代码

## uView版本号
2.0.38

## 测试平台（h5，android，ios，微信小程序，其他小程序）

## 备注

或者使用下面的链接创建 issue 以帮助我们更快的排查问题，不规范的 issue 会被关闭，感谢配合。

https://new-issue.uviewui.com/

umicro/uView2.0

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