静态文件

要提供静态文件，例如图像、CSS 文件和 JavaScript 文件，请使用 Express 中的 express.static 内置中间件函数。

函数签名是：

express.static(root, [options])

root 参数指定提供静态资产的根目录。有关 options 参数的更多信息，请参阅 express.static。

例如，使用以下代码在名为 public 的目录中提供图像、CSS 文件和 JavaScript 文件：

app.use(express.static('public'))

现在，您可以加载 public 目录中的文件：

http://localhost:3000/images/kitten.jpg
http://localhost:3000/css/style.css
http://localhost:3000/js/app.js
http://localhost:3000/images/bg.png
http://localhost:3000/hello.html

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app.use(express.static('public'))
app.use(express.static('files'))

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app.use('/static', express.static('public'))

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http://localhost:3000/static/images/kitten.jpg
http://localhost:3000/static/css/style.css
http://localhost:3000/static/js/app.js
http://localhost:3000/static/images/bg.png
http://localhost:3000/static/hello.html

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const path = require('path')
app.use('/static', express.static(path.join(__dirname, 'public')))

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