我一直想把它修好。以下是有效的方法:

使用最新的节点版本。我使用的是v14.15.5。运行:node——version来验证你的版本 命名文件，使它们都以.mjs而不是.js结尾

例子:

mod.mjs

export const STR = 'Hello World'

test.mjs

import {STR} from './mod.mjs'
console.log(STR)

执行命令node test.mjs

你应该看到“Hello World”。

我一直想把它修好。以下是有效的方法:

使用最新的节点版本。我使用的是v14.15.5。运行:node——version来验证你的版本 命名文件，使它们都以.mjs而不是.js结尾

例子:

mod.mjs

export const STR = 'Hello World'

test.mjs

import {STR} from './mod.mjs'
console.log(STR)

执行命令node test.mjs

你应该看到“Hello World”。

如果你可以使用'babel'，试着在package.json(——presets=es2015)中添加构建脚本，如下所示。它可以预编译导入代码到es2015

"build": "babel server --out-dir build --presets=es2015 && webpack"

错误:SyntaxError:未预期的令牌导入或SyntaxError:未预期的令牌导出

解决方案:以更改所有导入为例

const express               = require('express');
const webpack               = require('webpack');
const path                  = require('path');
const config                = require('../webpack.config.dev');
const open                  = require('open');

同时修改export default = foo;模块。出口= foo;

从版本14开始，Node的稳定版本支持import语句。x LTS。

你所需要做的就是在package.json中指定"type": "module"。

作为Node.js v12(这可能是相当稳定的现在，但仍然标记为“实验”)，你有两个选项使用ESM (ECMAScript模块)在Node.js(文件，有第三种方法计算字符串)，以下是文档所说的:

The --experimental-modules flag can be used to enable support for ECMAScript modules (ES modules). Once enabled, Node.js will treat the following as ES modules when passed to node as the initial input, or when referenced by import statements within ES module code: Files ending in .mjs. Files ending in .js, or extensionless files, when the nearest parent package.json file contains a top-level field "type" with a value of "module". Strings passed in as an argument to --eval or --print, or piped to node via STDIN, with the flag --input-type=module. Node.js will treat as CommonJS all other forms of input, such as .js files where the nearest parent package.json file contains no top-level "type" field, or string input without the flag --input-type. This behavior is to preserve backward compatibility. However, now that Node.js supports both CommonJS and ES modules, it is best to be explicit whenever possible. Node.js will treat the following as CommonJS when passed to node as the initial input, or when referenced by import statements within ES module code: Files ending in .cjs. Files ending in .js, or extensionless files, when the nearest parent package.json file contains a top-level field "type" with a value of "commonjs". Strings passed in as an argument to --eval or --print, or piped to node via STDIN, with the flag --input-type=commonjs.