好的，我正在学习 React、es6 和 webpack/babel。我的 webpack.config 设置如下:
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const merge = require('webpack-merge');
const validate = require('webpack-validator');
const parts = require('./config/webpack-parts');
const PATHS = {
app: path.join(__dirname, 'app'),
build: path.join(__dirname, 'build')
};
const HTMLWebpackPluginConfig = new HtmlWebpackPlugin({
template: PATHS.app + '/index.html',
filename: 'index.html',
inject: 'body'
});
const common = {
entry: {
app: PATHS.app
},
output: {
path: PATHS.build,
filename: '[name].js'
},
module: {
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: "babel-loader"
}
]
},
plugins: [HTMLWebpackPluginConfig]
};
var config;
switch(process.env.npm_lifecycle_event) {
case 'build':
config = merge(
common,
{
devtool: 'source-map',
output: {
path: PATHS.build,
filename: '[name].[chunkhash].js',
// This is used for require.ensure. The setup
// will work without but this is useful to set.
chunkFilename: '[chunkhash].js'
}
},
parts.clean(PATHS.build),
parts.extractBundle({
name: 'vendor',
entries: ['react']
}),
parts.minify(),
parts.extractCSS(PATHS.app)
);
break;
default:
config = merge(
common,
parts.setupCSS(PATHS.app),
{
devtool: 'eval-source-map'
},
parts.devServer({
// Customize host/port here if needed
host: process.env.HOST,
port: process.env.PORT
})
);
break;
}
module.exports = validate(config);
“config/webpack-parts”文件只是一些额外的模块/插件，问题不需要。只是旨在使其可以跨项目重用。我也设置了 babel，.babelrc 文件如下
{
"presets": [
"es2015",
"react"
]
}
我还在我的 package.json 文件中安装了所有 nesscary babel/webpack 插件:
"devDependencies": {
"babel-core": "^6.11.4",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.9.0",
"babel-preset-react": "^6.11.1",
"clean-webpack-plugin": "^0.1.10",
"css-loader": "^0.23.1",
"extract-text-webpack-plugin": "^1.0.1",
"html-webpack-plugin": "^2.22.0",
"style-loader": "^0.13.1",
"uglify-loader": "^1.3.0",
"webpack": "^1.13.1",
"webpack-dev-server": "^1.14.1",
"webpack-merge": "^0.14.1",
"webpack-validator": "^2.2.7"
},
"dependencies": {
"react": "^15.3.0",
"react-dom": "^15.3.0"
}
现在问题来了。我正在测试这一切是否有效，并使用 babel 等将 es6+react 代码转换为 es5。我已经设置了测试“hello.js”和“world.js”文件，并将它们导入到我的条目/主文件“index”中.js'。这就是错误所在。
hello.js
import React, {Component} from 'react';
export class Hello extends Component {
render() {
return (
<h1>Hello</h1>
)
}
}
世界.js
import React, {Component} from 'react';
export class World extends Component {
render() {
return (
<h1>World</h1>
)
}
}
index.js
import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import Hello from 'hello';
import World from 'world';
ReactDOM.render(<Hello/>, document.getElementById('hello'));
ReactDOM.render(<World/>, document.getElementById('world'));
预Web包index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Weather App</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
<div id="hello"></div>
<div id="world"></div>
</body>
</html>
当我运行 web pack 来执行其操作时，我在 web pack 上收到以下错误。
ERROR in ./app/index.js
Module not found: Error: Cannot resolve module 'hello' in /Users/Foysal/Google Drive/Learning Projects/ReactJS-Tutorial/weather-app/app
@ ./app/index.js 11:13-29
我在“world.js”文件中遇到类似的错误，并且我不知道导入/导出语句出了什么问题。我刚刚接触 es6 模块，但据我所知，我已正确导出和导入。我将不胜感激任何帮助，谢谢。
最佳答案
当您需要文件时，应该使用相对路径，例如:
import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import Hello from '../components/hello';
import World from '../components/world';
在您的示例中，节点在 node_modules 目录中查找 hello 和 world 模块。
关于javascript - ES6 模块、babel/webpack。导入/导出语句不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38776339/