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node8.5 使用import提示SyntaxError: Unexpected token import

发布于 8 年前作者 zhang8longfei 22109 次预览最后一次回复是 7 年前来自问答

代码结构：微信截图_20170922133618.png

demo.mjs

export function add(x, y) {
    return x + y;
}

main.mjs

import { add } from './demo.mjs';
console.log('Result: '+add(2, 3));

执行命令:node .\main.mjs --experimental-modules 错误提示：

(function (exports, require, module, __filename, __dirname) { import { add } from './demo.mjs';
 { add } from './demo.mjs';
                                                              ^^^^^^
SyntaxError: Unexpected token import
    at createScript (vm.js:74:10)
    at Object.runInThisContext (vm.js:116:10)
    at Module._compile (module.js:588:28)
    at Object.Module._extensions..js (module.js:635:10)
    at Module.load (module.js:545:32)
    at tryModuleLoad (module.js:508:12)
    at Function.Module._load (module.js:500:3)
    at Function.Module.runMain (module.js:665:10)
    at startup (bootstrap_node.js:201:16)
    at bootstrap_node.js:626:3

8 回复

dislido

1楼•8 年前

–experimental-modules要写在前面
node --experimental-modules .\main.mjs

zhang8longfei

2楼•8 年前

@dislido

(node:8624) ExperimentalWarning: The ESM module loader is experimental.
{ AssertionError [ERR_ASSERTION]: An invalid error message key was used: ERR_INVALID_PROTOCOL.
    at message (internal/errors.js:70:3)
    at NodeError (internal/errors.js:29:13)
    at resolveRequestUrl (internal/loader/resolveRequestUrl.js:84:11)
    at Loader.import (internal/loader/Loader.js:61:27)
    at Function.Module._load (module.js:462:27)
    at Function.Module.runMain (module.js:665:10)
    at startup (bootstrap_node.js:201:16)
    at bootstrap_node.js:626:3
  generatedMessage: false,
  name: 'AssertionError [ERR_ASSERTION]',
  code: 'ERR_ASSERTION',
  actual: undefined,
  expected: true,
  operator: '==' }