使用业务场景，循环多个图片上传控件，每一个上传到指定字段；

dom结构如下：

<u-form :model="userForm" :rules="rules" ref="uForm" labelWidth="160">			<u-form-item v-for="(item,index) in userForm.constructProcessList" :key="index" labelWidth="70" borderBottom><block slot="label" v-if="index<=5">{{ item.key }}：</block> <block slot="label" v-else>    <u-input v-model.trim="item.key" :placeholder="`请输入${item.key}`"></u-input></block>  <view style="display: flex; flex-wrap: wrap;"><view class="uni-uploader__input-box"><view class="uni-uploader__input" @tap="chooseImage(index)"></view></view><view class="uni-uploader__files" v-if="item.value!=null"><block v-for="(src,i) in item.value" :key="i"><view class="uni-uploader__file wrapAll"><uni-icons type="close" size="19" color="#b6b6b6" class="imgwrap"@click="deletePic(index,i)"></uni-icons><image class="uni-uploader__img" mode="aspectFill" :src="src" :data-src="src" @tap="previewImage($event,i)"></image></view>						</block></view>	</view><view style="font-size: 12px; color: #666;">仅支持.jpg, .jpeg, .png文件，最多能上传9个，且单个文件不超过20M</view><view style="width: 50px; margin: 0 auto;"><u-button type="error" shape="circle" icon="minus" @click="deleteItem(item, index)" v-if="index>5"></u-button></view>					</u-form-item><u-form-item labelWidth="70"><view style="width: 50px; margin: 0 auto;"><u-button type="primary" shape="circle" icon="plus" @click="addItem"></u-button></view>				</u-form-item>			</u-form>

js部分：

var sourceType = [['camera'],['album'],['camera', 'album']]var sizeType = [['compressed'],['original'],['compressed', 'original']]data() {return {				sourceTypeIndex: 2,sourceType: ['拍照', '相册', '拍照或相册'],sizeTypeIndex: 2,sizeType: ['压缩', '原图', '压缩或原图'],countIndex: 8,count: [1, 2, 3, 4, 5, 6, 7, 8, 9],		userForm: {					wellId: null,	constructProcessList:[{key:'字段1',value:[]},{key:'字段2',value:[]},{key:'字段3',value:[]},{key:'字段4',value:[]},{key:'字段5',value:[]},{key:'字段6',value:[]},],},rules: {wellId: {type: 'string',required: true},},}},methods: {addItem(){this.userForm.constructProcessList.push({key: '',value: []})},deleteItem(item, index){this.userForm.constructProcessList.splice(index, 1)},// 删除图片deletePic(index,i) {uni.showModal({content: "是否删除此图片？",success: (e) => {if (e.confirm) {this.userForm.constructProcessList[index].value.splice(i, 1);}}})},chooseImage: async function(i) {let _self = this;if (_self.userForm.constructProcessList[i].value.length >= 9) {let isContinue = await this.isFullImg(i);if (!isContinue) {return;}}				uni.chooseImage({sourceType: sourceType[this.sourceTypeIndex],sizeType: sizeType[this.sizeTypeIndex],count: 9,success: (res) => {	let tempFiles = res.tempFiles;let paths = tempFiles.map(file => file.path); // 提取路径					_self.userForm.constructProcessList[i].value = _self.userForm.constructProcessList[i].value.concat(paths);					// 发起上传图片的请求，将图片上传到服务器	//多图上传const pList = [];tempFiles.forEach(function(tempFile,item) {const p = new Promise(function (resolve, reject) {uni.uploadFile({url: _self.$api.baseUrl + "/nkdxsjcj/sys/base/uploadFiles",filePath: tempFile.path, name: 'files',header: {'token': uni.getStorageSync('token')},formData: {'files': tempFile.path,folderName: _self.userForm.wellId},success: function (resl) {const data = JSON.parse(resl.data);resolve(data);},fail: function (err) {uni.showToast({title: "上传失败："+err,icon: 'none',duration: 2000});reject(err);}});});pList.push(p);});Promise.all(pList).then(function (results) {let fileList=[];for(let j=0; j<results.length;j++){fileList.push(results[j].data.toString())}_self.userForm.constructProcessList[i].value.concat(fileList);console.log('上传结束：');}).catch(function (err) {uni.showToast({title: "上传失败："+err,icon: 'none',duration: 2000});return});				},complete:(resp)=>{let resSize = resp.tempFiles[0].size;if(resSize > 20971520){uni.showToast({title: "上传的图片大小不超过20m",icon: 'none',duration: 2000});return}}})},
isFullImg(i) {let _self = this;return new Promise((res) => {uni.showModal({content: "已经有9张图片了,是否清空现有图片？",success: (e) => {if (e.confirm) {_self.userForm.constructProcessList[i].value=[];res(true);} else {res(false)}},fail: () => {res(false)}})})},previewImage(e,i) {console.log(e)var current = e.target.dataset.src;				uni.previewImage({current: current,urls: this.userForm.constructProcessList[i].value})},
}