uniapp选定图片上传

ChooseImage() {
				uni.chooseImage({
					count: 4, //默认9
					sizeType: ['original', 'compressed'], //可以指定是原图还是压缩图，默认二者都有
					sourceType: ['album'], //从相册选择
					success: (res) => {
						if (this.imgList.length != 0) {
							this.imgList = this.imgList.concat(res.tempFilePaths)
						} else {
							this.imgList = res.tempFilePaths
						}
					// 	console.log(res.tempFiles);
					// 	let aaa = this.$tools.blobToDataURI(res.tempFiles[0],function(result){
					// console.log(result);
					let uploadTask = 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);
								},
								complete: ()=> {},
								fail: (res)=>{
									console.log(res)
								}
								
							 
					
				})
					}
				});
			},

生产环境中使用文件上传

ChooseImage() {
				uni.chooseImage({
					count: 4, //默认9
					sizeType: ['original', 'compressed'], //可以指定是原图还是压缩图，默认二者都有
					sourceType: ['album'], //从相册选择
					success: (res) => {
						console.log(res);
						if (this.imgList.length != 0) {
							
							this.imgList = this.imgList.concat(res.tempFilePaths)
						} else {
							this.imgList = res.tempFilePaths
						}
						console.log(res.tempFilePaths);
						// 文件转换
						// 	console.log(res.tempFiles);
						// 	let aaa = this.$tools.blobToDataURI(res.tempFiles[0],function(result){
						// console.log(result);
						
						// 文件上传
						let uploadTask = uni.uploadFile({
							header: {
								/* 这个地方每次都调用 */
								"X-Access-Token": uni.getStorageSync('token')
							},
							url: uni.getStorageSync('BaseUrl')+'/index/upload', //仅为示例，非真实的接口地址
							filePath: res.tempFilePaths[0],
							name: 'file',
							formData: {
								'user': 'test'
							},
							success: (uploadFileRes) => {
								console.log(uploadFileRes);
								console.log(uploadFileRes.data);
							},
							complete: () => {},
							fail: (res) => {
								console.log(res)
							}



						})
					}
				});
			},
			ViewImage(e) {
				uni.previewImage({
					urls: this.imgList,
					current: e.currentTarget.dataset.url
				});
			},
			DelImg(e) {
				uni.showModal({
					title: '删除图片',
					content: '确定要删除此图片？',
					cancelText: '取消',
					confirmText: '确定',
					success: res => {
						if (res.confirm) {
							this.imgList.splice(e.currentTarget.dataset.index, 1)
						}
					}
				})
			},

后台接收：
https://blog.csdn.net/wwppp987/article/details/123470369

js对前端上传的图片转换为blob和base64（不带上传，单独前端可跑）

				<view class="cu-bar bg-white margin-top">
					<view class="action">
						图片说明
					</view>
					<view class="action">
						{{imgList.length}}/1
					</view>
				</view>
				<view class="cu-form-group">
					<view class="grid col-4 grid-square flex-sub">
						<view class="bg-img" v-for="(item,index) in imgList" :key="index" @tap="ViewImage" :data-url="imgList[index]">
						 <image :src="imgList[index]" mode="aspectFill"></image>
							<view class="cu-tag bg-red" @tap.stop="DelImg" :data-index="index">
								<text class='cuIcon-close'></text>
							</view>
						</view>
						<view class="solids" @tap="ChooseImage" v-if="imgList.length<1">
							<text class='cuIcon-cameraadd'></text>
						</view>
					</view>
				</view>

data() {
			return {
				form:{
					imgList: [],
			}
		},

			ChooseImage() {
				uni.chooseImage({
					count: 4, //默认9
					sizeType: ['original', 'compressed'], //可以指定是原图还是压缩图，默认二者都有
					sourceType: ['album'], //从相册选择
					success: (res) => {
						if (this.imgList.length != 0) {
							this.imgList = this.imgList.concat(res.tempFilePaths)
						} else {
							this.imgList = res.tempFilePaths
						}
						console.log(res.tempFiles);
						let aaa = this.$tools.blobToDataURI(res.tempFiles[0],function(result){
					console.log(result);		
				})
					}
				});
			},

			ViewImage(e) {
				uni.previewImage({
					urls: this.imgList,
					current: e.currentTarget.dataset.url
				});
			},
			DelImg(e) {
				uni.showModal({
					title: '删除图片',
					content: '确定要删除此图片？',
					cancelText: '取消',
					confirmText: '确定',
					success: res => {
						if (res.confirm) {
							this.imgList.splice(e.currentTarget.dataset.index, 1)
						}
					}
				})
			},

其中：

// blob流转换为base64

export function blobToDataURI(blob, callback) {
	console.log(blob);
   let reader = new FileReader();
   reader.readAsDataURL(blob);
   reader.onload = function (e) {
       callback(e.target.result);
   }
}

// base64转换为blob流
function dataURItoBlob(base64Data) {
    //console.log(base64Data);//data:image/png;base64,
    var byteString;
    if(base64Data.split(',')[0].indexOf('base64') >= 0)
        byteString = atob(base64Data.split(',')[1]);//base64 解码
    else{
        byteString = unescape(base64Data.split(',')[1]);
    }
    var mimeString = base64Data.split(',')[0].split(':')[1].split(';')[0];//mime类型 -- image/png

    // var arrayBuffer = new ArrayBuffer(byteString.length); //创建缓冲数组
    // var ia = new Uint8Array(arrayBuffer);//创建视图
    var ia = new Uint8Array(byteString.length);//创建视图
    for(var i = 0; i < byteString.length; i++) {
        ia[i] = byteString.charCodeAt(i);
    }
    var blob = new Blob([ia], {
        type: mimeString
    });
    return blob;

效果图：