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TL;DR 所有这些方式（、和）都用于在 HTML 文档中加载和执行 JavaScript 文件，但它们在浏览器处理脚本的加载和执行方式上有所不同：是包含 JavaScript 的默认方式。浏览器在下载和执行脚本时会阻止 HTML 解析。在脚本执行完毕之前，浏览器不会继续渲染页面。异步下载脚本，与解析 HTML 并行。在脚本可用后立即执行脚本，可能会中断 HTML 解析。之间不会互相等...

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