CSS规则visibility:hidden和display:none都会导致元素不可见。这些是同义词吗?
当前回答
可见性:隐藏将元素保留在页面中，并占用该空间，但不显示给用户。
显示:无将在页面中不可用，不占用任何空间。
其他回答
它们不是同义词——display:没有一个会从页面流中移除元素，页面的其余部分就像它不存在一样。
可见性:hidden在视图中隐藏元素，但不隐藏页面流，在页面上为其留下空间。
有一件事值得补充，尽管它没有被问到，是有第三个选项，使对象完全透明。考虑:
1 <a href="http://example.com" style="display: none;"> < / >链接。< br / > <a href="http://example.com" style="可见性:隐藏;"> < / >链接。< br / > <a href="http://example.com" style="不透明度:0;"> < / >链接。
(请务必点击上面的“运行代码片段”按钮查看结果。)
1和2之间的区别已经指出了(即2仍然占据空间)。但是，2和3之间有区别:在情况3中，鼠标停留在链接上时仍然会切换到手，用户仍然可以单击链接，Javascript事件仍然会在链接上触发。这通常不是你想要的行为(但有时可能是?)
另一个区别是，如果你选择文本，然后复制/粘贴为纯文本，你会得到以下结果:
1st link.
2nd link.
3rd unseen link.
在情况3中，文本被复制了。也许这对于某种类型的水印是有用的，或者如果你想隐藏一个版权声明，如果一个粗心的用户复制/粘贴你的内容会显示出来?
当涉及到子节点时，有很大的不同。例如:如果你有一个父div和一个嵌套的子div。所以如果你这样写:
<div id="parent" style="display:none;">
<div id="child" style="display:block;"></div>
</div>
在这种情况下，没有divs是可见的。但如果你这样写:
<div id="parent" style="visibility:hidden;">
<div id="child" style="visibility:visible;"></div>
</div>
然后子div将可见，而父div将不显示。
如果可视性属性设置为“hidden”，浏览器仍然会在页面上为内容占用空间，即使它是不可见的。 但是当我们将一个对象设置为“display:none”时，浏览器不会在页面上为其内容分配空间。
例子:
<div style="display:none">
Content not display on screen and even space not taken.
</div>
<div style="visibility:hidden">
Content not display on screen but it will take space on screen.
</div>
查看详细信息
总结所有其他答案:
| visibility | display |
|---|---|
| element with visibility: hidden, is hidden for all practical purposes (mouse pointers, keyboard focus, screenreaders), but still occupies space in the rendered markup | element with display:none, is hidden for all practical purposes (mouse pointers, keyboard focus, screenreaders), and DOES NOT occupy space in the rendered markup |
| css transitions can be applied for visibility changes | css transitions can not be applied on display changes |
| you can make a parent visibility:hidden but a child with visibility: visible would still be shown | when parent is display:none, children can't override and make themselves visible |
| part of the DOM tree (so you can still target it with DOM queries) | part of the DOM tree (so you can still target it with DOM queries) |
| part of the render tree | NOT part of the render tree |
| any reflow / layout in the parent element or child elements, would possibly trigger a reflow in these elements as well, as they are part of the render tree. | any reflow / layout in the parent element, would not impact these elements, as these are not part of the render tree |
| toggling between visibility: hidden and visible, would possibly not trigger a reflow / layout. (According to this comment it does: What is the difference between visibility:hidden and display:none? and possibly according to this as well https://developers.google.com/speed/docs/insights/browser-reflow) | toggling between display:none to display: (something else), would lead to a layout /reflow as this element would now become part of the render tree |
| you can measure the element through DOM methods | you can not measure the element or its descendants using DOM methods |
| If you have a huge number of elements using visibility: none on the page, the browser might hang while rendering, as all these elements require layout, even though they are not shown | If you have a huge number of elements using display:none, they wouldn't impact the rendering as they are not part of the render tree |
资源:
https://developers.google.com/speed/docs/insights/browser-reflow http://www.stubbornella.org/content/2009/03/27/reflows-repaints-css-performance-making-your-javascript-slow/ visibility:hidden和display:none
其他信息:
还有一些浏览器支持特性，但它们似乎适用于非常老的浏览器，在其他答案中也有，所以我在这里没有讨论它们。 还有其他一些隐藏元素的方法，比如不透明度，或者屏幕外的绝对定位。所有这些方法在一些或其他的回答中都有涉及，并且都有一些缺点。 根据这条评论(可见性:hidden和display:none之间的性能差异)，如果你有很多元素使用display:none并且你将其更改为display:(其他)，它将导致单个回流，而如果你有多个可见性:hidden元素并且你将它们变为可见，它将导致每个元素的回流。(我不太明白)
