Remove Duplicate Scripts .

最新推荐文章于 2024-01-13 15:43:56 发布

转载最新推荐文章于 2024-01-13 15:43:56 发布 · 358 阅读

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#javascript #internet #performance #firefox #include #web

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本文探讨了在同一页面中重复加载相同JavaScript文件的问题，指出这种做法会导致不必要的HTTP请求及浪费JavaScript执行时间，尤其在Internet Explorer中更为明显。

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It hurts performance to include the same JavaScript file twice in one page. This isn't as unusual as you might think. A review of the ten top U.S. web sites shows that two of them contain a duplicated script. Two main factors increase the odds of a script being duplicated in a single web page: team size and number of scripts. When it does happen, duplicate scripts hurt performance by creating unnecessary HTTP requests and wasted JavaScript execution.
Unnecessary HTTP requests happen in Internet Explorer, but not in Firefox. In Internet Explorer, if an external script is included twice and is not cacheable, it generates two HTTP requests during page loading. Even if the script is cacheable, extra HTTP requests occur when the user reloads the page.
In addition to generating wasteful HTTP requests, time is wasted evaluating the script multiple times. This redundant JavaScript execution happens in both Firefox and Internet Explorer, regardless of whether the script is cacheable.