c_cpp_properties.json的代码应该如何配置

要放在browse里面，你放在外面（后面）了。
https://code.visualstudio.com/docs/cpp/c-cpp-properties-schema-reference

"browse": {
        "path": [这里是你上面的路径],
        "limitSymbolsToIncludedHeaders": true,
        "databaseFilename": ""
      }