如何知道在哪里使用css，less和Sass？-Howtoknowwheretousecss,lessandSass?

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As zzzzBov said, LESS and SASS are css preprocessors.

正如zzzzBov所说,LESS和SASS是css预处理器。

Basically, you pick one and write your style definitions in that language. When done you run it through the preprocessor and it will generate a normal CSS file for you. That normal file is what you would use in your site.

基本上,您选择一个并用该语言编写样式定义。完成后,通过预处理器运行它,它将为您生成一个普通的CSS文件。该普通文件是您在网站中使用的文件。

I'd highly suggest that you skip using SASS/LESS or any other preprocessor until you are more familiar with CSS in general.

我强烈建议你跳过使用SASS / LESS或任何其他预处理器,直到你对CSS更熟悉。

A little more information about LESS.

关于LESS的更多信息。

LESS can be run ahead of time as an actual preprocessor OR you can simply link the less.js file and your .less file and let the browser do it. The problem with letting the browser do it is that every single browser that hits your site, for every single page, will have to "recompile" the css in order to render your site correctly. Considering you have zero control over the computers hitting your sites this might result in a "slow" site from some peoples perspective.

LESS可以作为实际的预处理器提前运行,或者您只需链接less.js文件和.less文件,然后让浏览器执行此操作。让浏览器执行此操作的问题在于,每个浏览网站的每个浏览器都必须“重新编译”css才能正确呈现您的网站。考虑到您无法控制访问您网站的计算机,从某些人的角度来看,这可能会导致“慢”网站。

Further, that Javascript only works in some of the browsers, further limiting it's usefulness.

此外,Javascript仅适用于某些浏览器,进一步限制了它的实用性。

Quite frankly, CSS is one of those things that you generally set up once for a site and leave alone for a year or more. So, it may simply just not be worth it.

坦率地说,CSS是您通常为一个站点设置一次并且独自离开一年或更长时间的事情之一。所以,它可能只是不值得。

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SASS and LESS are two Domain Specific Languages that are converted to CSS via a preprocessor. The preprocessor can run client-side in Javascript or server-side via PHP, Node.js, Rails, etc.

SASS和LESS是两种特定于域的语言,它们通过预处理器转换为CSS。预处理器可以通过PHP,Node.js,Rails等在Javascript或服务器端运行客户端。

Either SASS or LESS would be excellent for a new project. Or if you're using a framework that makes use either technology. (Such as Bootstrap or Rails).

SASS或LESS对于一个新项目来说都是非常好的。或者,如果您使用的是使用任一技术的框架。 (例如Bootstrap或Rails)。

If you're modifying an existing web site which uses pure CSS (such as Wordpress) you should almost always extend and build off of the existing styles. Mixing plain CSS with SASS/LESS can be a mess especially if you are just learning the technology.

如果您要修改使用纯CSS(例如Wordpress)的现有网站,您几乎应该总是扩展并构建现有样式。将纯CSS与SASS / LESS混合可能会很麻烦,特别是如果您只是学习该技术。

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Both are here to make your job easier //save time, make your CSS more readable, you will no longer forget colors/margins or specific values that you used, because you can create variables, mixins etc.

两者都是为了让您的工作更轻松//节省时间,让您的CSS更具可读性,您将不再忘记您使用的颜色/边距或特定值,因为您可以创建变量,mixins等。

If you feel like you would benefit from any of features provided, why wouldn't you use it? It's not mandatory to use those, it's not like I would use CSS for every project I create (majority though). Try it out, it won't take more than an hour to know basic features.

如果您觉得您可以从所提供的任何功能中受益,为什么不使用它?使用它们并不是强制性的,它不像我会为我创建的每个项目使用CSS(尽管多数)。尝试一下,了解基本功能不会超过一个小时。