什么&。“在”&。scss字幕的显示吗?-Whatdoes'&.'in'&.sub-title'indicatesinscss?

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The & concatenates the parent class, resulting in .title.sub-title (rather than .title .sub-title if the & is omitted).

&连接父类，产生.title。副标题(而不是.title . subtitle(如果省略了&))。

The result is that with the & it matches an element with both title and sub-title classes:

结果是&与标题类和子标题类匹配的元素:

whilst without the & it would match a descendent with class sub-title of an element with class title:

而如果没有&，则与带有类标题的元素的类副标题匹配:

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