解决方法

来到bootstrap官网getbootstrap.com/docs/4.6/ge… 查看对应的版本号,然后使用npm指定版本号进行安装。

例如：

<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.min.js" integrity="sha384-VHvPCCyXqtD5DqJeNxl2dtTyhF78xXNXdkwX1CZeRusQfRKp+tA7hAShOK/B/fQ2" crossorigin="anonymous"></script>

安装后在自定义的js/ts文件中引入

declare var $: any;
import 'bootstrap';
import '../../scss/bsc-excution/bsc-excution.scss';
......

配置webpack

const path = require('path');
var webpack = require('webpack');

module.exports = {
......
    module: {
        ......, {
            test: /\.(scss)$/,
            use: [{
                loader: 'style-loader', // inject CSS to page
            }, {
                loader: 'css-loader', // translates CSS into CommonJS modules
            }, {
                loader: 'postcss-loader', // Run post css actions
                options: {
                    plugins: function () { // post css plugins, can be exported to postcss.config.js
                        return [
                            require('precss'),
                            require('autoprefixer')
                        ];
                    }
                }
            }, {
                loader: 'sass-loader' // compiles Sass to CSS
            }]
        }, ],
    },
    ......
    plugins: [
        new webpack.ProvidePlugin({
           $: "jquery",
           jQuery: "jquery",
           'window.jQuery': 'jquery',
           Popper: ['popper.js', 'default'],
       })
    ],
    ......
};