为什么使用id&类的html为什么不只是一个？ [英] why use id's & class's in html why not just one?

问题描述

我知道id和类的id之间有一个区别，给予一个唯一的项目，类的和类似的标签，他们可以给予多个项目。

i understand what there is a difference between id's and class's - ids and ment to be given to a unique item, and class's and like tags, they can be given to multiple items..

但是为什么你需要有两个，在过去，我曾经使用#id写的一切（这是当我是写html和did not知道任何不同），代码仍然工作..

but why do you need to have both, in the past i used to write everything using #id (this was when i was new to writing html and didnt know any different) and the code still worked.. would not have been 100% valid but still worked.

我知道现在使用html5你可以定义区域不同，但是这不是说使用html5

i know now using html5 you can define areas differently, but for this im not talking about using html5

推荐答案

想象一下，如果你有一个按钮在页面上看起来是一样的。 您希望在CSS中重复多次吗？

Imagine if you had a load of buttons that looked the same on the page. Would you want to repeat yourself numerous times in your CSS? Or use a class and write it once.

这适用于不同元素上相同样式的任何情况。

This is applicable in any case of the same styling on different elements.

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