1、angular 使用 bootstrap

　　安装bootstrap

npm install bootstrap --save

　　安装bootstrap-icons

npm i bootstrap-icons

　　并在angular.json添加配置

            "styles": [
              "src/styles.scss",
              "./node_modules/bootstrap/dist/css/bootstrap.min.css",
              "./node_modules/bootstrap-icons/font/bootstrap-icons.css"
            ],
            "scripts": [
              "./node_modules/bootstrap/dist/js/bootstrap.js"
            ]