我到处都找遍了，但显然，我找不到一个解决方案。我需要通过导入其他文件中定义的各种函数来创建一个模块化的javascript应用程序，但当我运行调试工具时，我得到了这个错误：

C:\Program Files\nodejs\node.exe .\app.js
Uncaught ReferenceError ReferenceError: arr1 is not defined
    at sum (c:\Users\Desktop\tes\sum.js:10:18)
    at <anonymous> (c:\Users\Desktop\test\app.js:9:1)
    at run (internal/modules/esm/module_job:193:25)
    --- async function ---
    at runMainESM (internal/modules/run_main:55:21)
    at executeUserEntryPoint (internal/modules/run_main:78:5)
    at <anonymous> (internal/main/run_main_module:17:47)
Process exited with code 1

这是我的准则

• 应用程序.js*

import { add } from "./sum.js";
var arr1 = [1, 2, 3];
var arr2 = [1, 2, 3];
var tab1 = [1, 2, 3];
var tab2 = [1, 2, 3];

sum( arr1, arr2, tab1 , tab2);

• 总和.js*

export function add(){
var arr3 = arr1.map((x, i) => x + arr2[i]);
console.log(arr3)
}

• 包.json*

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}