使用jQuery设置元标记值时遇到问题 [英] Having trouble using jQuery to set meta tag values

问题描述

可能重复:
可以使用javascript来更改页面的元标记?

Possible Duplicate:
Is it possible to use javascript to change the meta-tags of the page?

我正在尝试使用jQuery设置元标记(请不要回答这是没有道理的，因为搜索引擎等等……我正在加载调用检查这些值的第三方Javascript函数，例如Tweetmeme和Facebook).

I'm trying to set meta tags using jQuery (please don't reply that this doesn't make sense since search engines blah-blah-blah... I am loading invoking 3rd party Javascript functions that examine these vales, such as Tweetmeme and Facebook).

如果我使用:

 $('meta[name=some-name]').attr('content', 'some value');

设置现有元标记的值确实有效，但是如果不存在这样的命名标记，则不会创建元标记.

it does work to set the value of an existing meta tag, but does not create a meta tag if such a named one does not exist.

如果您对此有见识或经验，请回复...

If you have insight or experience with this, please reply...

推荐答案

您可以执行此操作，而不是最干净的操作，但是您尝试执行的操作很奇怪，因此没有一个很好的方法来处理它:

You can do this, not the cleanest, but what you're trying to do is pretty odd so there's not a great way to handle it:

var mt = $('meta[name=some-name]');
mt = mt.length ? mt : $('<meta name="some-name" />').appendTo('head');
mt.attr('content', 'some value');

其中的条件表达式检查.length，如果找不到则为0或false，如果是这种情况，我们创建元素并将其附加到头部(无论是添加还是最初找到的元素)，mt现在已设置为具有该名称的<meta>，您可以设置属性.

The conditional expression in there checks .length, which is 0 or false if not found, if that's the case we create the element and append it to the head, whether it was added or originally found, mt is set to the <meta> with that name now, and you can set the attribute.

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