blocks|key|2678840|text|因为id%2Bselector+(#iddiv+span)比类更具体。任一|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2678841|#iddiv+span.myclass|code-block|syntax|javascript|2678842|或|2678843|#iddiv+.myclass|2678844|对这个案子应该是有效的。|2678845|了解更多关于CSS+specificity+here的信息，或者通过谷歌了解更多。|offset|length|2678846|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/TR/CSS21/cascade.html#specificity^0|0|0|0|0|0|M|4|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

Because id+selector (#iddiv span) is more specific than a class. Either

<pre><code>#iddiv span.myclass
</code></pre>

or 

<pre><code>#iddiv .myclass
</code></pre>

should work for this case.

Learn more about CSS specificity <a href="http://www.w3.org/TR/CSS21/cascade.html#specificity">here</a> or by Googling it.

blocks|key|1062869|text|CSS根据选择器的具体情况应用样式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062870|#iddiv+span比myclass更具体。将其更改为#iddiv+.myclass应该会为您解决此问题。|offset|length|style|CODE|1062871|这里有一篇文章对此进行了更深入的探讨：http://htmldog.com/guides/cssadvanced/specificity/|1062872|entityMap|0|LINK|mutability|MUTABLE|url|http://htmldog.com/guides/cssadvanced/specificity/^0|0|0|B|C|7|S|F|0|J|1E|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]|$D|V|E|W|F|G]|$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

CSS applies styles according to the specificity of the selectors 

<code>#iddiv span</code> is more specific than <code>myclass</code>. Changing it to <code>#iddiv .myclass</code> should fix the issue for you.

Here's an article that goes more in depth about this : <a href="http://htmldog.com/guides/cssadvanced/specificity/" rel="noreferrer">http://htmldog.com/guides/cssadvanced/specificity/</a>

blocks|key|4752198|text|它不起作用，因为第一种风格更具体。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4752199|要修复它，请确保更直接地针对第二个span，如下所示|offset|length|style|CODE|4752200|#iddiv+span.myclass|4752201|http://jsfiddle.net/jasongennaro/5fe9A/|4752202|entityMap|0|LINK|mutability|MUTABLE|url^0|0|H|4|0|0|J|0|0|13|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|L|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|K]]]]

It's not working because the first style is more specific.

To fix it, make sure you target the second <code>span</code> more directly, like this

<code>#iddiv span.myclass</code>

<a href="http://jsfiddle.net/jasongennaro/5fe9A/" rel="nofollow">http://jsfiddle.net/jasongennaro/5fe9A/</a>

blocks|key|2678925|text|您可以始终使用!important标志来覆盖：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2678926|.myclass+{
++++width:+10px+!important;
}|code-block|syntax|javascript|2678927|entityMap^0|7|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You could always use the <code>!important</code> flag to override:

<pre><code>.myclass {
 width: 10px !important;
}
</code></pre>

blocks|key|2964641|text|首先，我建议你像其他人建议的那样，适当地瞄准你的选择器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2964642|但是，当所有其他方法都失败时，您可以使用!important。|offset|length|2964643|entityMap|0|LINK|mutability|MUTABLE|url|http://webdesign.about.com/od/css/f/blcssfaqimportn.htm^0|0|K|A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

First of all, I'd suggest you properly target your selectors, as others are suggesting. 

But when all else fails, you can use <a href="http://webdesign.about.com/od/css/f/blcssfaqimportn.htm" rel="nofollow">!important</a>.

blocks|key|2964679|text|请记住使用关键字!important，该关键字用于覆盖父规则。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2964680|你也可以用下面的方式定义你的"myclass“：|2964681|#iddiv+span.myclass+{
++++width:10px;
}|code-block|syntax|javascript|2964682|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Remember to use the keyword, !important, which functions to overwrite parent rules. 

Also you can define your "myclass" in the following way:

<pre><code>#iddiv span.myclass {
 width:10px;
}
</code></pre>

<pre><code>#iddiv span {
 display: inline-block;
 width: 190px;
}
.myclass {
 width:10px;
}
</code></pre>

Then I have 

<pre><code>&lt;div id="iddiv"&gt;
 &lt;span&gt;hello:&lt;/span&gt; 
 &lt;span class="myclass"&gt;yeah&lt;/span&gt; &lt;br/&gt;
&lt;/div&gt;
</code></pre>

I would like the first <code>span</code>'s <code>width</code> to be 190px, and second's to be 10px. But both are 190px: why it's not overriding the <code>width</code> propoerty?

EDIT: Thanks for your responses. What about unsetting width? I don't want 10px width, just default width as if it was undefined

Overriding properties in CSS

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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#iddiv span { display: inline-block; width: 190px;}.myclass { width:10px;}然后我有<div id="iddiv"> hello: yeah</s...

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