本来以为它们两个是没什么太大区别的,但是今天上网上一查,发现还是有些区别的。最主要的大概就是在CSS定义中,ID是以#开头的,而class是以.开头的。而且在网页编程中,一个ID只能出现一次,就像某个东西的标识符一样,在一个页面中,只能有一个,而class是可以出现多次的。看了一篇文章说,id是先找到结构或内容,再套用样式,而class是先定义好样式,再应用到多个结构或内容上,呵呵,还真有点这么回事
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