最后一步run webpack出错了。前面的步骤都完成了没问题。

相关代码：

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
    mode:'development',
    entry:'./index.js',
    output: {
        path: path.resolve(__dirname,'dist'),
        filename:'[name].js'
    },
    module:{
        rules:[{
            test:/\.css$/,
            // loader:'css-loader' 单个loader的话这样写
            use:[MiniCssExtractPlugin.loader, 'css-loader']
        }]
    },
    plugins:[
        new HtmlWebpackPlugin({
            template:'./index.html',
            filename:'index.html'

        }),
        new MiniCssExtractPlugin({
            filename:"css/[name].css"
        })
    ]
};

​