Webpack and bundlersWebpack和捆绑版

Installing Bootstrap安装Bootstrap程序

Install bootstrap as a Node.js module using npm.使用npm将Bootstrap安装为Node.js模块。

Importing 导入JavaScript

Import Bootstrap’s JavaScript by adding this line to your app’s entry point (usually index.js or app.js):通过将此行添加到应用程序的入口点（通常为index.js或app.js），导入Bootstrap程序的JavaScript：

// You can specify which plugins you need
import { Tooltip, Toast, Popover } from 'bootstrap';

Alternatively, if you only need just a few of our plugins, you may import plugins individually as needed:或者，如果您只需要我们的几个插件，您可以根据需要单独导入插件：

import Alert from 'bootstrap/js/dist/alert';
...

Bootstrap depends on Popper, which is specified in the peerDependencies property. This means that you will have to make sure to add it to your package.json using npm install @popperjs/core.

Importing Styles导入样式

Importing Precompiled Sass导入预编译的Sass

To enjoy the full potential of Bootstrap and customize it to your needs, use the source files as a part of your project’s bundling process.要充分发挥Bootstrap的潜力并根据您的需要对其进行定制，请将源文件用作项目捆绑过程的一部分。

First, create your own _custom.scss and use it to override the built-in custom variables. 首先，创建自己的custom.scss并使用它覆盖内置的自定义变量。Then, use your main Sass file to import your custom variables, followed by Bootstrap:然后，使用主Sass文件导入自定义变量，然后导入Bootstrap：

@import "custom";
@import "~bootstrap/scss/bootstrap";

For Bootstrap to compile, make sure you install and use the required loaders: sass-loader, postcss-loader with Autoprefixer. 要编译Bootstrap程序，请确保安装并使用所需的加载程序：sass-loader、带Autoprefixer的postcss-loader。With minimal setup, your webpack config should include this rule or similar:通过最少的设置，您的网页包配置应包括以下规则或类似规则：

// ...
{
test: /\.(scss)$/,
use: [{
// inject CSS to page
    loader: 'style-loader'
}, {
// translates CSS into CommonJS modules
    loader: 'css-loader'
}, {
// Run postcss actions
    loader: 'postcss-loader',
options: {
// `postcssOptions` is needed for postcss 8.x;
      // if you use postcss 7.x skip the key
      postcssOptions: {
// postcss plugins, can be exported to postcss.config.js
        plugins: function () {
return [
require('autoprefixer')
];
}
}
}
}, {
// compiles Sass to CSS
    loader: 'sass-loader'
}]
}
// ...

Importing Compiled CSS导入已编译的CSS

Alternatively, you may use Bootstrap’s ready-to-use CSS by simply adding this line to your project’s entry point:或者，您可以使用Bootstrap的即用CSS，只需将以下行添加到项目的入口点：

import 'bootstrap/dist/css/bootstrap.min.css';

In this case you may use your existing rule for css without any special modifications to webpack config, except you don’t need sass-loader just style-loader and css-loader.在这种情况下，您可以使用现有的css规则，而无需对webpack配置进行任何特殊修改，除非您不需要sass-loader，只需要style-loader和css-loader。

// ...
module: {
rules: [
{
test: /\.css$/,
use: [
'style-loader',
'css-loader'
]
}
]
}
// ...