Error:if there’s nested data,rowKey is required

原因是element-ui的版本问题，项目中package.json中版本信息如下

  "dependencies": {
    "@stomp/stompjs": "^4.0.8",
    "axios": "^0.18.0",
    "echarts": "^4.1.0",
    "element-ui": "^2.4.8",
    "js-cookie": "^2.2.0",
    "localforage": "^1.7.2",
    "node-sass": "4.9.2",
    "normalize.css": "^8.0.0",
    "nprogress": "^0.2.0",
    "vue": "^2.6.10",
    "vue-router": "^3.0.1",
    "vuex": "^3.0.1"
  }

“element-ui”: “^2.4.8”,版本带 ^ 的默认使用最新版本。所以产生错误提示。

解决办法
1.去掉 ^ 符号

"element-ui": "2.4.8",

2.保持版本配置不变，在表单中加入 row-key属性:

row-key="id"