because I want to use jQuery plug-ins in react, I have no problem introducing jquery, into the module in the way npm install jquery-save is used in the development environment. But now after npm run build, open the packaged index.html file, the page will report the error of: jQuery is not defind. I would like to ask you, what may be the reason for this? 1.
1.webpack has also defined the global variable of jquery.
2.webpack version is 1.x

webpack Code:

//
var path = require("path")
var webpack = require("webpack")
var HtmlWebpackPlugin = require("html-webpack-plugin");
var ExtractTextPlugin = require("extract-text-webpack-plugin");
var OpenBrowserPlugin = require("open-browser-webpack-plugin");

// var nodeModulesPath = path.resolve(__dirname, "node_modules")
// console.log(process.env.NODE_ENV)

module.exports = {
    entry: path.resolve(__dirname, "app/index.jsx"),
    output: {
        path: __dirname + "/build",
        filename: "bundle.js"
    },

    resolve:{
        extensions:["", ".js",".jsx"],
        alias: {
            handsontable: path.resolve(__dirname, "node_modules/handsontable-pro")
        }
    },

    module: {
        // preLoaders: [
        //     //  
        //     {test: /\.(js|jsx)$/, loader: "eslint-loader", exclude: /node_modules/}
        // ],
        loaders: [
            { test: /\.(js|jsx)$/, exclude: /node_modules/, loader: "babel-loader",
            query: {
              presets: ["react", "es2015"],
                // ant-design 
              plugins: ["react-html-attrs",["import", { "libraryName": "antd" }]]
            }},
            { test: /\.less$/, exclude: /node_modules/, loader: "style!css!postcss!less" },
            { test: /\.css$/, loader: "style!css!postcss" },
            { test:/\.(png|gif|jpg|jpeg|bmp)$/i, loader:"url-loader?limit=5000&name=img/[name].[ext]" },
            { test:/\.(woff|woff2|svg|ttf|eot)($|\?)/i, loader:"url-loader?limit=5000&name=fonts/[name].[ext]"}
        ]
    },

    eslint: {
        configFile: ".eslintrc" // Rules for eslint
    },

    postcss: [
        require("autoprefixer") //autoprefixer display: flex
    ],

    plugins: [
        // html 
        new HtmlWebpackPlugin({
            template: __dirname + "/app/index.tmpl.html",
            favicon: "./ico/favicon.ico"
        }),

        // 
        new webpack.HotModuleReplacementPlugin(),

        // 
        new OpenBrowserPlugin({
          url: "http://localhost:8090/-sharp/login"
        }),

        //  js  __DEV__ devdev, production
        new webpack.DefinePlugin({
          __DEV__: JSON.stringify(JSON.parse((process.env.NODE_ENV == "dev") || "false"))
        }),

        // jQuery
        new webpack.ProvidePlugin({ 
            $:"jquery", 
            jQuery:"jquery", 
            "window.jQuery":"jquery" 
        }),
    ],

    devServer: {
        proxy: {
          //  `/WHP.HydroPower`  `/WHP.SSO`  http  localhost:8080 
          "/WHP.HydroPower": {
            target: "http://localhost:8080",
            secure: false
          },
          "/WHP.SSO": {
            target: "http://localhost:8080",
            secure: false
          }
        },
        contentBase: "./public", //
        colors: true, //
        historyApiFallback: true, //
        inline: true, //
        hot: true  //  HotModuleReplacementPlugin
    }
}