blocks|key|1119817|text|我试了一下，然后让它用一个插件工作，然后意识到代码实际上没有插件，显然是使用了转换。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1119818|JSFiddle|offset|length|1119819|$('a').click(function(){
++++$('div').show().animate({'opacity':1});
});|code-block|syntax|javascript|1119820|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/fPtU5/2/^0|0|0|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I tried a bit, then got it working using a plugin, then realized the code actually worked without the plugin, apparently using the transition.

<a href="http://jsfiddle.net/fPtU5/2/" rel="nofollow">JSFiddle</a>

<pre><code>$('a').click(function(){
 $('div').show().animate({'opacity':1});
});
</code></pre>

blocks|key|2258972|text|在本文的帮助下解决了这个问题：http://www.greywyvern.com/?post=337#|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2258973|.dropzone+{
++++visibility:hidden;
++++opacity:0;
++++background:+rgba(0,0,0,.85);
++++position:+absolute;
++++top:+0;
++++left:+0;
++++right:+0;
++++bottom:+0;
++++z-index:+9999;
++-webkit-transition:+visibility+0s+ease-in-out+.2s,+opacity+.2s+ease-in-out;
+++-moz-transition:+visibility+0s+ease-in-out+.2s,+opacity+.2s+ease-in-out;
++++-ms-transition:+visibility+0s+ease-in-out+.2s,+opacity+.2s+ease-in-out;
+++++-o-transition:+visibility+0s+ease-in-out+.2s,+opacity+.2s+ease-in-out;
++++++++transition:+visibility+0s+ease-in-out+.2s,+opacity+.2s+ease-in-out;+
}++

.opaque+{
++++visibility:visible;
++++opacity:1;
++++transition-delay:0s;
}+|code-block|syntax|javascript|2258974|然后，当您想要触发淡入/退出时，添加/删除这个类|2258975|$('.dropzone').addClass('opaque');|style|CODE|2258976|entityMap|0|LINK|mutability|MUTABLE|url|http://www.greywyvern.com/?post=337#^0|F|10|0|0|0|0|0|Y|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|12|8|@$A|13|B|14|M|N]]|9|@]|C|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Figured it out with the help of this article: <a href="http://www.greywyvern.com/?post=337#" rel="nofollow">http://www.greywyvern.com/?post=337#</a>

<pre><code>.dropzone {
 visibility:hidden;
 opacity:0;
 background: rgba(0,0,0,.85);
 position: absolute;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;
 z-index: 9999;
 -webkit-transition: visibility 0s ease-in-out .2s, opacity .2s ease-in-out;
 -moz-transition: visibility 0s ease-in-out .2s, opacity .2s ease-in-out;
 -ms-transition: visibility 0s ease-in-out .2s, opacity .2s ease-in-out;
 -o-transition: visibility 0s ease-in-out .2s, opacity .2s ease-in-out;
 transition: visibility 0s ease-in-out .2s, opacity .2s ease-in-out; 
} 

.opaque {
 visibility:visible;
 opacity:1;
 transition-delay:0s;
} 
</code></pre>

And then when you want to trigger fade in/out add/remove this class

<code>$('.dropzone').addClass('opaque');</code>

blocks|key|1122892|text|我不知道为什么显示属性软管的css动画，但这里有一些有趣的观察/修改您的原始小提琴。http://jsfiddle.net/5RF5A/。即使在将显示设置为块和不透明度为1之间仅延迟一个毫秒，也将允许css动画工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1122893|我在尝试使用css动画不透明时一直遇到这个问题，但同时需要display:none将元素从文档流中提取出来。我通常添加的位置:绝对或高度/宽度:0或可见性:隐藏(而不透明度为0)，而不是显示:无，所以我仍然可以动画的不透明度。|style|CODE|1122894|我的猜测是，(我很好奇在这之后去做一些研究)，这是某种浏览器再流/重新绘制的东西。可能很遥远，但那是我开始寻找的地方|1122895|编辑:找到显示上的转换:属性。对这个问题有一些很好的答案/见解。|1122896|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/5RF5A/|1|https://stackoverflow.com/questions/3331353/transitions-on-the-display-property^0|16|Q|0|0|T|C|0|0|5|9|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@$A|10|B|11|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]]]

I don't know why the display property hoses the css animation, but here are some interesting observations/modifications to your original fiddle. <a href="http://jsfiddle.net/5RF5A/" rel="nofollow noreferrer">http://jsfiddle.net/5RF5A/</a>. Even just a ms of delay between setting the display to block and the opacity to 1 will allow the css animation to work.

I run into this issue all the time when trying to use css to animate opacity, but at the same time needing <code>display:none</code> to take the element out of the document flow. I usually add position:absolute or height/width:0 or visibility:hidden (while opacity is 0) instead of display:none so I can still animate the opacity.

My guess, (and i'm curious enough to go do some research after this), is it is some sort of browser reflow/repaint thing. Could be way off but that's where i'll start looking

Edit:
Found <a href="https://stackoverflow.com/questions/3331353/transitions-on-the-display-property">Transitions on the display: property</a>. Has some very good answers/insight into the issue.

I run into this problem in every single project, and I'm fed up enough at this point to ask.

I'm wanting to use css3 for fade animations on things because of how nice and smooth it is compared to fadeIn, etc.

The problem is, 99% of the time I'm fading in something that is initially set to <code>display:none;</code> (meaning, just having it at <code>opacity: 0</code> to start, and changing it to <code>opacity: 1</code> with jQuery isn't good enough.

For example, for my drag and drop functionality, I have an absolute positioned div: <code>#dropzone</code>, and that obviously can't be covering the entire app (but just set to zero opacity the whole time).

If I try adding <code>$('#dropzone').show().css('opacity',1)</code> there is no fade.

When it finishes <code>.show()</code>, it's still set to <code>opacity 0</code> (I know because if I stop it right there, nothing shows up. It's set to <code>display:block</code> with <code>opacity: 0</code>) -- it also already has the proper css3 <code>transition</code> properties on it, so why would it not animate by the time it hits <code>.css()</code>?

This has plagued me so much, I would love to fix this or know the proper way.

Thanks

<a href="http://jsfiddle.net/fPtU5" rel="nofollow">http://jsfiddle.net/fPtU5</a> 

edit added jsfiddle

Properly showing element from hidden with css3

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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我在每一个项目中都遇到了这个问题，现在我已经厌倦了去问这个问题。我想使用css3的东西褪色动画，因为它是多么美好和平滑相比，fadeIn，等等。问题是，99%的时间我都在最初设置为display:none;的东西中逐渐淡出(这意味着，仅仅让它在opacity: 0上启动，然后用jQuery将其更改为opacity: 1...

问用css3正确显示隐藏元素
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