uniapp小程序实现上传图片功能，并显示上传进度

效果图：

实现方法：

一、通过uni.chooseMedia(OBJECT)方法，拍摄或从手机相册中选择图片或视频。

官方文档链接: https://uniapp.dcloud.net.cn/api/media/video.html#choosemedia

uni.chooseMedia({
  count: 9,
  mediaType: ['image','video'],
  sourceType: ['album', 'camera'],
  maxDuration: 30,
  camera: 'back',
  success(res) {
    console.log(res.tempFiles)
  }
})

二、使用uni.uploadFile(OBJECT)方法上传文件。

官方文档链接: https://uniapp.dcloud.net.cn/api/request/network-file.html#uploadfile

uni.chooseImage({
	success: (chooseImageRes) => {
		const tempFilePaths = chooseImageRes.tempFilePaths;
		uni.uploadFile({
			url: 'https://www.example.com/upload', //仅为示例，非真实的接口地址
			filePath: tempFilePaths[0],
			name: 'file',
			formData: {
				'user': 'test'
			},
			success: (uploadFileRes) => {
				console.log(uploadFileRes.data);
			}
		});
	}
});

var uploadTask = uni.uploadFile({
	url: 'https://www.example.com/upload', //仅为示例，并非真实接口地址。
	complete: ()=> {}
});
uploadTask.abort();

三、使用progress进度条组件，实现上传进度显示。

三、完整代码。

功能：1、上传图片支持进度显示 2、控制每张图片大小不超过8兆 3、当选择图片超过最大数量时，添加图片按钮控制隐藏

<template>
	<view class="material-box">
		<view class="material-select">
			<view class="material-png" v-for="(item,index) in imageList" :key="index">
				<view class="material-sent" v-if="!item.uploadStatus">
					<progress class="select-tips" :percent="item.schedule" stroke-width="4" activeColor="#B99C65" />
					<view class="tips-text">
						上传进度{{item.schedule}}%
					</view>
				</view>
				<image src="@/qualifyLnvestor/static/close.png" mode="" class="close-png" @click="closeImg(index)">
				</image>
				<image :src="item.tempFilePath" mode="" class="selected-png" v-if="item.type=='image'"></image>
				<view v-else class="selected-name">{{item.name}}</view>
			</view>
			<view class="material-png" @click="selectPicture" v-if="selectimageIsShow">
				<image src="@/qualifyLnvestor/static/picture.png" mode="" class="picture-png"></image>
				<view class="picture-text">
					添加证明
				</view>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				imageList: [], // 反显图片集合
				cusNo: '', // 客户号
				selectimageIsShow: true, // 添加图片功能按钮默认显示
				accessToken: '',
			};
		},
		methods: {
			selectPicture() {
				const that = this;
				// if(this.imageList.length == 15){
				// 	showModal("温馨提示", '最多上传15个文件')
				// }else{
				// 	let counts = (15-this.imageList.length) > 9 ? 9 : (15-this.imageList.length);
				if (this.imageList.length == 5) {
					showModal("温馨提示", '最多上传5个文件')
				} else {
					let counts = (5 - this.imageList.length)
					uni.chooseMedia({
						count: counts,
						mediaType: ['image'],
						sourceType: ['album', 'camera'],
						success: (res) => {
							console.log('选择图片', res)
							let tempFilePaths = res.tempFiles;
							let selectImage = [];
							tempFilePaths.forEach((item) => {
								if (item.size >= 8388608) {
									showModal("温馨提示", '单个文件大小不能超过8M')
								} else {
									selectImage.push({
										type: item.fileType,
										tempFilePath: item.tempFilePath,
										name: new Date().getTime(),
										schedule: 0,
										uploadStatus: false,
									})
								}
							})
							that.imageList = that.imageList.concat(selectImage);
							if (that.imageList.length == 5) {
								that.selectimageIsShow = false
							}
							that.imageList.forEach((item) => {
								if (!item.uploadStatus) {
									const uploadTask = uni.uploadFile({
										url: apiUrl.hotActivity +
										'/quaInv/upload', //上传接口地址
										filePath: item.tempFilePath,
										name: 'fileList',
										header: {
											'content-type': 'multipart/form-data'
										},
										formData: {
											'cusNo': that.cusNo,
											'accessToken': that.accessToken,
										},
										success: (uploadFileRes) => {
											if (uploadFileRes.statusCode == 200) {
												let uploadDate = JSON.parse(uploadFileRes
													.data);
												if (uploadDate.code == 'MOP000000') {
													item.contenidNo = uploadDate.data;
												} else {
													that.selectimageIsShow = true;
													this.imageList = this.imageList.filter(
														item => {
															return item.contenidNo !=
																undefined && item
																.contenidNo == null &&
																item.contenidNo == ''
														});
												}
											}
											console.log(uploadFileRes);
											// item.contenidNo = uploadFileRes.data.
										}
									});

									uploadTask.onProgressUpdate((res) => {
										console.log('上传进度' + res.progress);
										console.log('已经上传的数据长度' + res.totalBytesSent);
										console.log('预期需要上传的数据总长度' + res
											.totalBytesExpectedToSend);
										item.schedule = res.progress;
										if (res.progress == 100) {
											item.uploadStatus = true;
										}
										// 测试条件，取消上传任务。
										if (res.progress > 50000) {
											uploadTask.abort();
										}
									});
								}
							})
						}
					});
				}
			}
		}
	}
</script>
<style lang="scss">
		.material-box {
			width: 686rpx;
			padding: 32rpx;
			background: #fff;
			margin-top: 24rpx;
			margin-left: 32rpx;
			padding-bottom: 32rpx;
			border-radius: 8rpx;

			.item-top {
				height: 50rpx;
				line-height: 50rpx;
				font-size: 36rpx;
				font-weight: 500;
				color: #333;
			}

			.material-item {
				width: 622rpx;
				border-radius: 8rpx;
				background: #f8f8f8;
				padding: 16rpx;
				margin-top: 24rpx;

				.item-list {
					font-size: 28rpx;
					font-weight: 400;
					line-height: 56rpx;
					height: 56rpx;
					color: #B99C65;
				}
			}

			.material-select {
				display: flex;
				flex-wrap: wrap;
				margin-top: 24rpx;

				.material-png {
					width: 191rpx;
					height: 191rpx;
					border-radius: 12rpx;
					border: 2rpx dashed #B99C65;
					margin-right: 8rpx;
					margin-left: 8rpx;
					margin-bottom: 16rpx;
					position: relative;
					display: flex;
					align-items: center;
					justify-content: center;
					flex-direction: column;
					background: #F8F8F8;

					.material-sent {
						width: 189rpx;
						height: 189rpx;
						background: rgba(245, 245, 245, 0.5);
						position: absolute;
						display: flex;
						justify-content: center;
						align-items: center;
						flex-direction: column;

						.select-tips {
							width: 130rpx;
							height: 10rpx;
							margin-bottom: 12rpx;
						}

						.tips-text {
							font-size: 24rpx;
							color: #B99C65;
						}
					}

					.close-png {
						position: absolute;
						top: 6rpx;
						right: 6rpx;
						width: 40rpx;
						height: 40rpx;
					}

					.selected-png {
						width: 180rpx;
						height: 180rpx;
						border-radius: 12rpx;
					}

					.selected-name {
						width: 180rpx;
						word-break: break-all;
						overflow: hidden;
					}

					.picture-png {
						width: 40rpx;
						height: 32rpx;
						margin-bottom: 8rpx;
					}

					.picture-text {
						font-size: 28rpx;
						height: 40rpx;
						line-height: 40rpx;
						color: #B99C65;
					}
				}
			}
		}	
</style>