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网站优化-页面加载时间和DOM操作

[英]Website Optimization - Page Load Time & DOM manipulations

原文 2014-05-15 23:45:37 9 1 javascript/ optimization/ google-analytics/ page-load-time/ pingdom

Just wondering whether JavaScript execution ie for DOM Manipulation is taken into account by Tools like http://tools.pingdom.com/ , Google Analytics that calculate a Web pages Load Time obviously there is a distinction between Download Time & Load Time? 只是想知道是否通过http://tools.pingdom.com/之类的工具（即计算网页加载时间的Google Analytics（分析））考虑了JavaScript执行（即DOM操作），显然下载时间和加载时间之间有区别吗？ Does Load time include when JS has finished executing? 加载时间是否包括JS完成执行的时间？

1 个解决方案

Good question! 好问题！ The short answer is no. 最简洁的答案是不。

JavaScript "load time" is dependent on complexity, latency to fetch files (CDNs, etc.), and other browser-dependent factors. JavaScript的“加载时间”取决于复杂性，获取文件（CDN等）的延迟以及其他与浏览器有关的因素。

A tool like Google Analytics receives data about the page (through tracking pixels), but isn't the same as a bonafide web browser. 诸如Google Analytics（分析）之类的工具（通过跟踪像素）接收有关页面的数据，但与真正的Web浏览器不同。

A tool like Pingdom or Pingometer which monitors a site either does a HEAD or GET request to the page. 诸如Pingdom或Pingometer之类的监视站点的工具会对页面执行HEAD或GET请求。

In the case of a HEAD request, no code is downloaded or executed -- only headers. 在HEAD请求的情况下，不会下载或执行任何代码-只会下载标头。

In the case of a GET request, code is actually downloaded (and a factor for load time) but not executed. 在GET请求的情况下，实际上会下载代码（以及加载时间的因素），但不会执行。