【upload自动上传】实现多文件上传请求一次接口

绑定change事件轻松搞定

 <el-upload
    action=""
    multiple
    :file-list="fileList"
    http-request=""
    :on-change="handleChange"
>
    自动上传
</el-upload>

 handleChange(file, fileList) {
  let length = fileList.length;
  setTimeout(() => {
    if (length == fileList.length) {
      //此处触发接口请求（只会请求一次）
    }
  }, 0);
},