according to the description on the official website, chunkFileName is used to name the package file that does not appear in the entry file in the output configuration, and filename is used to name the package file name corresponding to the entry file, but the results do not correspond to each other during the test. Why? The webpack configuration is as follows:

const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CleanWebpackPlugin = require("clean-webpack-plugin");
const BundleAnalyzerPlugin = require("webpack-bundle-analyzer").BundleAnalyzerPlugin;

module.exports = {
    entry: {
        "index1": "./src/index1.js",
        "index2": "./src/index2.js",
        "index3": "./src/index3.js"
    },
    output: {
        filename: "[name].asd.js",
        chunkFilename: "[name].[contenthash].js",
        path: path.resolve(__dirname, "distribution")
    },
    //use inline-source-map for development:
    devtool: "inline-source-map",

    //use source-map for production:
    // devtool: "source-map",
    devServer: {
        contentBase: "./distribution"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                loader: "babel-loader",
                include: [path.resolve(__dirname, "src")],
                exclude: [path.resolve(__dirname, "node_modules")]
            }
        ]
    },
    plugins: [
        new CleanWebpackPlugin(["distribution"]),
        new BundleAnalyzerPlugin({
            openAnalyzer: false,
            analyzerMode: "static",
            reportFilename: "bundle-analyzer-report.html"
        }),
        new HtmlWebpackPlugin({
            template: "./src/index1.html",
            filename: "index1.html",
            chunks: ["index1", "manifest", "vendor", "common"]
        }),
        new HtmlWebpackPlugin({
            template: "./src/index2.html",
            filename: "index2.html",
            chunks: ["index2", "manifest", "vendor", "common"]

        }),
        new HtmlWebpackPlugin({
            template: "./src/index3.html",
            filename: "index3.html",
            chunks: ["index3", "manifest", "vendor", "common"]

        }),
        new webpack.HashedModuleIdsPlugin()

    ],
    // optimization: {
    //     runtimeChunk: {
    //         "name": "manifest"
    //     },
    //     splitChunks: {
    //         cacheGroups: {
    //             default: false,
    //             vendors: false,
    //             vendor: {
    //                 test: /[\\/]node_modules[\\/]/,
    //                 chunks: "initial",
    //                 enforce: true,
    //                 priority: 10,
    //                 name: "vendor"
    //             },
    //             common: {
    //                 chunks: "all",
    //                 minChunks: 2,
    //                 name: "common",
    //                 enforce: true,
    //                 priority: 5
    //             }
    //         }
    //     }
    // }
    optimization: {
        runtimeChunk: {
            "name": "manifest"
        },
        splitChunks: {
            chunks: "all",
            minSize: 0,
            cacheGroups: {
                default: false,
                vendors: false,
                vendor: {
                    test: /[\\/]node_modules[\\/]/,
                    chunks: "initial",
                    enforce: true,
                    priority: 10,
                    name: "vendor"
                },
                common: {
                    chunks: "all",
                    minChunks: 2,
                    name: "common",
                    enforce: true,
                    priority: 5
                }
            },
        }
    }

};

the result is shown in figure

as far as I understand it, the filename of output in configuration is [name] .asd.js. In theory, the packaged index1.js,index2.js, index3.js should correspond to this index1.asd.js, index2.asd.js, index3.asd.js, and other js files are hashed. Instead, the manifest chunk that is not in the entry file is named according to filename format. Answer