Javascript 为什么我的巴别塔导入不起作用？_Javascript_Webpack_Babeljs

Javascript 为什么我的巴别塔导入不起作用？

javascript webpack

Javascript 为什么我的巴别塔导入不起作用？,javascript,webpack,babeljs,Javascript,Webpack,Babeljs,my-module.js function cube(x) { return x * x * x; } const foo = Math.PI + Math.SQRT2; export { cube, foo }; app.js import React from 'react'; import ReactDOM from 'react-dom'; import {cube} from './my-module'; 控制台日志（多维数据集（2））；没有错误，但显示，import似乎不起

my-module.js

function cube(x) {
  return x * x * x;
}
const foo = Math.PI + Math.SQRT2;
export { cube, foo };

app.js

import React from 'react';
import ReactDOM from 'react-dom';
import {cube} from './my-module';

控制台日志（多维数据集（2））；没有错误，但显示，

import

似乎不起作用<代码>stackoverflow，无需更多详细信息，代码已显示我的意思，请不要强制我们添加更多详细信息

"ReferenceError: cube is not defined
    at eval (eval at 35 (http://localhost:8080/build/bundle.js:84:1), <anonymous>:1:1)
    at Object.35 (http://localhost:8080/build/bundle.js:84:1)
    at __webpack_require__ (http://localhost:8080/build/bundle.js:20:30)
    at Object.34 (http://localhost:8080/build/bundle.js:71:18)
    at __webpack_require__ (http://localhost:8080/build/bundle.js:20:30)
    at http://localhost:8080/build/bundle.js:63:18
    at http://localhost:8080/build/bundle.js:66:10"

B.法律改革委员会

{
  "presets": [
    "es2015",
    "react",
    "stage-0"
  ],
  "plugins": [
    "transform-react-jsx"
  ],
  "retainLines": true,
  "sourceMaps": "both",
  "ignore": [
    "*.css"
  ]
}

尝试从“/my module”导入{cube}

当您执行导入多维数据集时，您正在查找默认导出

我试图用您提供的信息重现错误，但无法执行

具体来说，我创建了这个简单的项目，一切都按预期进行

package.json

{
  "name": "dummy-react",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel": "^6.23.0",
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.2",
    "babel-plugin-transform-react-jsx": "^6.24.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "webpack": "^3.10.0"
  }
}

.babelrc

{
  "presets": [
    "es2015",
    "react",
    "stage-0"
  ],
  "plugins": [
    "transform-react-jsx"
  ],
  "retainLines": true,
  "sourceMaps": "both",
  "ignore": [
    "*.css"
  ]
}

webpack.config.js

var webpack = require('webpack')

module.exports = {
  entry: './app.js',
  output: {
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: ['babel-loader'],
        exclude: /(node_modules)/
      }
   ]
  }
}

function cube(x) {
  return x * x * x;
}
const foo = Math.PI + Math.SQRT2;
export { cube, foo };

import React from 'react'
import ReactDOM from 'react-dom'
import {cube} from './my-module'

console.log(cube(2))

ReactDOM.render(
  <h1>Hello, World!</h1>,
  document.getElementById('root')
);

my module.js

var webpack = require('webpack')

module.exports = {
  entry: './app.js',
  output: {
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: ['babel-loader'],
        exclude: /(node_modules)/
      }
   ]
  }
}

function cube(x) {
  return x * x * x;
}
const foo = Math.PI + Math.SQRT2;
export { cube, foo };

import React from 'react'
import ReactDOM from 'react-dom'
import {cube} from './my-module'

console.log(cube(2))

ReactDOM.render(
  <h1>Hello, World!</h1>,
  document.getElementById('root')
);

app.js

var webpack = require('webpack')

module.exports = {
  entry: './app.js',
  output: {
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: ['babel-loader'],
        exclude: /(node_modules)/
      }
   ]
  }
}

function cube(x) {
  return x * x * x;
}
const foo = Math.PI + Math.SQRT2;
export { cube, foo };

import React from 'react'
import ReactDOM from 'react-dom'
import {cube} from './my-module'

console.log(cube(2))

ReactDOM.render(
  <h1>Hello, World!</h1>,
  document.getElementById('root')
);

从“React”导入React
从“react dom”导入react dom
从“/my module”导入{cube}
控制台日志（多维数据集（2））
ReactDOM.render(
你好，世界！，
document.getElementById（'root'））
);

index.html

<html>
  <head>
  </head>
  <body>
     <div id="root"></div>
     <script src="./bundle.js"></script>
  </body>
</html>

因此，问题可能不在您提供的代码中。

bablrc

not

bablerc

还有它的

import{cube}from./my module'

@azium，您好，

import React from'React'

行也显示

React

未定义`仍然不工作，行

import React from'React'

也显示

React

未定义。你是对的，Chrome浏览器说

React

未定义，实际上已定义，似乎即使我在行

import{cube}from./my module'中添加了一个断点，我们无法使用chrome控制台查看反应是什么。