应该JQuery代码在页眉或页脚？ [英] Should Jquery code go in header or footer?
问题描述
所有脚本都应该最后加载几乎所有情况下，最好将所有脚本引用放在页面末尾，位于< / body> <之前。 / code>。
如果由于模板问题和其他原因无法这样做，请使用 defer 属性修饰脚本标记以便浏览器知道在下载HTML后下载脚本：
< script src =my.js type =text / javascriptdefer =defer>< / script>
边缘情况
然而，在页面加载期间，您可能会遇到页面闪烁或其他工件，通常可以通过将您的jQuery脚本引用置于< head> 标记，而无需 defer 属性。这些情况包括jQuery UI和其他插件，如jCarousel或Treeview，它们将DOM作为其功能的一部分来修改。
有些库必须在DOM或CSS之前加载，例如polyfills。 Modernizr就是这样一个库，它必须放置在头标记中。
Where is the best place to put Jquery code (or separate Jquery file)? Will pages load faster if I put it in the footer?
All scripts should be loaded last
In just about every case, it's best to place all your script references at the end of the page, just before </body>.
If you are unable to do so due to templating issues and whatnot, decorate your script tags with the defer attribute so that the browser knows to download your scripts after the HTML has been downloaded:
<script src="my.js" type="text/javascript" defer="defer"></script>
Edge cases
There are some edge cases, however, where you may experience page flickering or other artifacts during page load which can usually be solved by simply placing your jQuery script references in the <head> tag without the defer attribute. These cases include jQuery UI and other addons such as jCarousel or Treeview which modify the DOM as part of their functionality.
Further caveats
There are some libraries that must be loaded before the DOM or CSS, such as polyfills. Modernizr is one such library that must be placed in the head tag.
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