Javascript:动态添加属性到< html />标签 [英] Javascript: Adding attribute dynamically to the <html /> tag

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问题描述

我正在尝试将FB xmlns属性添加到文档的< html> 标签(< html lang =enxml: lang =enxmlns =http://www.w3.org/1999/xhtml> )。由于某些原因,如下所示添加它不起作用:

  htmltag = document.getElementsByTagName('html'); 
htmltag [0] .setAttribute(xmlns:fb,http://www.facebook.com/2008/fbml););
pre>

我该怎么做?



谢谢!



更新:没有jquery或其他lib可用。

解决方案

这可能不是你想要的答案:)



使用客户端代码处理语义标记并不是很好的做法,它隐藏了大多数机器的有价值的机器可读信息,HTML已被获取,解析并在JavaScript执行*时显示*美元短暂和一天迟到!



如果您可以在服务器上添加属性,然后将其发送到浏览器,



如果您有在客户端执行,不要被像jQuery或其他任何框架那样诱惑,那就是一个小任务的巨大开销。



*非科学测试


I'm trying to add FB xmlns attribute to the document's <html> tag (<html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">) dynamically. For some reason adding it like below does not work:

htmltag  = document.getElementsByTagName ('html');
htmltag[0].setAttribute("xmlns:fb","http://www.facebook.com/2008/fbml");");

How can I do it?

Thanks!

Update: No jquery or other lib is available.

解决方案

This probably isn't the answer you're wanting :)

Tacking on semantic markup with client-side code is not good practice. It hides the valuable machine-readable info from most machines. The HTML is already fetched, parsed and displayed by the time Javascript executes*. A dollar short and a day late!

If you can add the attributes on the server, before it is sent to the browser, go for it.

If you have to do it client-side; don't be tempted by a framework like jQuery or whatever. That's a huge overhead for a small task.

*non-scientific tests

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