element-ui Upload上传组件动态配置action方式

<el-upload
   class="upload-file"
   ref="upload"
   :limit="currentTableData.length"
   :headers="upload.headers"
   :action="upload.newurl"
   :on-exceed="handleExceed"
   :before-remove="beforeRemove"
   :before-upload="handleFileBefore"
   :auto-upload="false"
   multiple
>

export default {
data() {
	return {
		// 上传参数
		upload: {
			// 设置上传的请求头部
			headers: { Authorization: "Bearer " + getToken() },
			// 上传的地址
			newurl:'',
			url: process.env.VUE_APP_BASE_API + "/nfm/nfmfile/upload/",
			relationid:null,
		},
	}
},
methods: {
	handleExceed(files, fileList) {
		this.$message.warning(`当前限制选择 ${this.currentTableData.length} 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
	},
	beforeRemove(file, fileList) {
		return this.$confirm(`确定移除 ${ file.name }？`);
	},
	handleFileBefore(file){
		return new Promise((resolve, reject) => {
			// 拼接上传url
			// 此处动态配置action URL
			this.upload.newurl = this.upload.url + this.upload.relationid;
			// dom上传地址更新完成后，触发上传
			this.$nextTick(() => resolve());
		});
	},
}