chore: upgrade to vue2.7

.eslintrc.js

 module.exports = {
+  root: true,
   env: {
     node: true
   },
-  extends: ['plugin:vue/essential', 'standard'],
+  extends: ['eslint:recommended', 'plugin:vue/essential'],
   rules: {
-    'vue/no-mutating-props': 'off', // 暂时关闭
     'vue/comment-directive': 'off',
     'vue/multi-word-component-names': 'off',
-    'space-before-function-paren': 'off'
+    'vue/no-mutating-props': 'off' // 暂时关闭
   }
 }

jsconfig.json

+{
+  "compilerOptions": {
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    }
+  },
+  "exclude": ["node_modules", "dist"],
+  "vueCompilerOptions": {
+    "target": 2.7
+  }
+}