创建 React 应用程序：快速准备好 React 项目 反应 工具和库

启动一个新的 React 项目并不是那么简单。您必须花时间配置正确的构建工具来设置本地开发环境、单元测试和生产构建，而不是直接深入代码并将应用程序付诸实践。幸运的是，Create React App (CRA) 的形式提供了帮助。创建 React 应用程序徽标 Create-React-App是 Facebook 的一个命令行工具，允许您生成新的 React 项目并使用预配置的 webpack 构建进​​行开发。它早已成为 React 生态系统不可或缺的一部分，无需在 React 应用程序中维护复杂的构建管道，让您可以专注于项目本身。 创建 React 应用程序如何工作？ Create React App 是一个独立的工具，可以使用 npm 或 Yarn 运行。 您可以生成并运行一个新的 React 应用程序 Learn to Code with JavaScript 您只需使用 npm 几个命令即可在新文件夹中生成并运行新的 React 应用程序向您的项目添加一个包，其中包含所有配置和构建脚本。

换句话说，您的项目取决于包react-script，而不是create-react-app其本身。安装完成后，您可以启动开发服务器并开始处理您的项目。 基本特点 本地开发服务器 Learn to Code with JavaScript 您首先需要的是本地开发环境。运行时npm start将启动带有 黎巴嫩电话号码表 观察程序的 Webpack 开发服务器，一旦您更改某些内容，该观察程序将自动重新加载应用程序。从 v4 开始，Create React App 支持 React 的快速刷新，作为热模块替换的替代方案。与它的前身一样，这允许我们在更改代码库后快速刷新应用程序的部分内容，但也有一些新功能。快速重新加载将尝试仅重新加载应用程序的修改部分，保留功能组件和挂钩的状态，并在更正语法错误后自动重新加载应用程序。 您还可以通过 HTTPS 为您的应用程序提供服务，方法是在运行服务器之前将HTTPS变量设置为。



些支持的功能包括： 异步/等待 对象静止/传播属性 动态导入() 类字段和静态属性 请注意，Create React App 不为运行时功能提供任何填充，因此如果您需要其中任何功能，则需要自己包含它们。 资产导入 您可以从 JavaScript 模块导入 CSS 文件、图像或字体，以便捆绑应用程序中使用的文件。构建应用程序后，Create React App 会将这些文件复制到构建文件夹中。这是导入图像的示例您还可以在 CSS 中使用此功能： .image { background-image: url(./image.png); } 造型 如上一节所述，Create React App 允许您通过导入所需的 CSS 文件来添加样式。构建应用程序时，所有 CSS 文件将连接成一个包并添加到构建文件夹中。 Create React App 还支持CSS 模块。按照约定，名为 as 的文件*.module.css被视为 CSS 模块。

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