高性能web建站规则（外部js和css通常更好一些）_html/css

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高性能web建站规则（外部js和css通常更好一些）_html/css_WEB-ITnose

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Jun 21, 2016 am 08:46 AM

对于js和css，通常的做法有两种，一种将js和css直接嵌入到页面中，称为内联，另外一种就是通过src和link进行外部导入，称为外置。那么，哪一种更好一些呢？通常情况下外置更好一些，为什么呢？

用户往往从首页打开以后，会继续跳转到其余页面。比如说，从csdn首页到博客，再到极客头条，那么，假如打开首页时，外部的js和css被缓存起来了，接下来的请求中，公用的js和css就不会再从服务器上获取，内联的方式是没有办法缓存的。
假如说你网站的用户有很大的比重只访问首页，那么内联就会减少http请求，相对的加载速度就会更快。
但从大部分网站的功能上看，用户访问多个后续页面的几率要大于只访问首页，所以外置的倾向就会大一些。

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