`script` 和 `link as="script"` 标签之间的区别
Difference between `script` and `link as="script"` tags
除加载脚本的标准方法外：
<script src="js/script.js"></script>
我见过有人这样做：
<link href="js/script.js" as="script">
有区别吗？
注意：有一个类似的 What's the difference between using link and script tag to reference JavaScript source? 问题询问 <link href="script.js" type="text/javascript" />，这是不同的。
如果那个 link 标签上有 rel="preload"（或 rel="modulepreload"），它将表示一个预加载请求，它会预加载，但不会预加载 运行，脚本。相反，script 加载并 运行 脚本。但是如果没有 rel，那 link 是无效的并且没有任何有用的效果（至少在规范方面）。
如果您在规范中查找 link，您会看到 as 列为：
as — Potential destination for a preload request (for rel="preload" and rel="modulepreload")
在 link 到 as 属性之后，它说：
The as attribute specifies the potential destination for a preload request for the resource given by the href attribute. It is an enumerated attribute. Each potential destination is a keyword for this attribute, mapping to a state of the same name. The attribute must be specified on link elements that have a rel attribute that contains the preload keyword. It may be specified on link elements that have a rel attribute that contains the modulepreload keyword; in such cases it must have a value which is a script-like destination. For other link elements, it must not be specified.
除加载脚本的标准方法外：
<script src="js/script.js"></script>
我见过有人这样做：
<link href="js/script.js" as="script">
有区别吗？
注意：有一个类似的 What's the difference between using link and script tag to reference JavaScript source? 问题询问 <link href="script.js" type="text/javascript" />，这是不同的。
如果那个 link 标签上有 rel="preload"（或 rel="modulepreload"），它将表示一个预加载请求，它会预加载，但不会预加载 运行，脚本。相反，script 加载并 运行 脚本。但是如果没有 rel，那 link 是无效的并且没有任何有用的效果（至少在规范方面）。
如果您在规范中查找 link，您会看到 as 列为：
as— Potential destination for a preload request (forrel="preload"andrel="modulepreload")
在 link 到 as 属性之后，它说：
The
asattribute specifies the potential destination for a preload request for the resource given by thehrefattribute. It is an enumerated attribute. Each potential destination is a keyword for this attribute, mapping to a state of the same name. The attribute must be specified onlinkelements that have arelattribute that contains thepreloadkeyword. It may be specified onlinkelements that have arelattribute that contains themodulepreloadkeyword; in such cases it must have a value which is a script-like destination. For otherlinkelements, it must not be specified.