# 5.import & Partials

CSS本身帶有導入**@import**功能，可以把其他CSS 檔案包含進來，但由於每次使用**@import** 瀏覽器每一次都會發出新的對HTTP的請求，來下載要被導入的檔案，因為每一次HTTP的請求都會消耗資源，所以就會讓網頁變的更慢。

SASS擴展了這個功能，他可以在一個SASS 檔案裡面，去把其他的SASS檔案包含進來，SASS會把他們編譯成一個CSS檔案，這樣就可以把項目要的樣式分割成不同小部分，然後用這種導入的方式，把眾多小部分包含到一個SASS檔案中，這些小部分在SASS裡面叫做 **Partials** ，每一個partials就是一個SASS檔案，檔案名稱前面需要加一個**下底線 \_** ，讓SASS知道這是一個partials。

partials 檔案命名例: **\_base.scss** 

![](https://2396662457-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LlX7mJ4cxCl8pMfjLFQ%2F-LlX7o7G0jAxtu25nekE%2F-LlX7pNJT6Yce3z1PcHn%2Fsass19.jpg?generation=1565014590030066\&alt=media)


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