blocks|key|580130|text|这是因为黄色内容的absolute位置。您必须更改top值，使其在不使用z-index属性的情况下工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|580131|#section{
++background:yellow;+
++position:absolute;+
++top:50px;+
++bottom:0;+
++left:0;+
++right:0;+
++overflow:hidden;+
++float:left;+
}|code-block|syntax|javascript|580132|小提琴|580133|然后，#section在DOM树中跟踪#header。这意味着z-index的默认值设置为2，#section的默认值为1。这就解释了为什么它位于#header的顶部。您还必须添加一个位置值，例如，position:+relative;到#header中，以使其与更改元素的顺序一起工作。|580134|摆弄DOM树中位置的变化|580135|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/quk37k0q/1/|1|https://jsfiddle.net/quk37k0q/3/^0|9|8|P|3|10|7|0|0|0|3|0|0|3|8|J|7|V|7|19|1|1B|8|1O|1|21|7|2R|J|3B|7|0|0|C|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|M|3|N|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1V|8|@]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|Q|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]]]

<p>It's because of the <code>absolute</code> position of the yellow content. You have to change <code>top</code> value to make it works without <code>z-index</code> property</p>

<pre><code>#section{
  background:yellow; 
  position:absolute; 
  top:50px; 
  bottom:0; 
  left:0; 
  right:0; 
  overflow:hidden; 
  float:left; 
}
</code></pre>

<p><a href="https://jsfiddle.net/quk37k0q/1/" rel="nofollow">Fiddle</a></p>

<p>Then, <code>#section</code> is after <code>#header</code> in the DOM tree. It means it default value of <code>z-index</code> is set to <code>2</code> and <code>#section</code> has a default value of <code>1</code>. This explains why it is on the top of <code>#header</code>. You also has to add a position value, for instance <code>position: relative;</code> to the <code>#header</code> to make it works with changing the order of elements.</p>

<p><a href="https://jsfiddle.net/quk37k0q/3/" rel="nofollow">Fiddle with change of position in the DOM tree</a></p>


blocks|key|695525|text|您能否只更新CSS以不使用z索引，并将背景色应用于正文标记？JS+Fiddle。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|695526|*{
margin:0;
padding:0;
}
body+{
++background:yellow;+
}
#header{
width:100%25;+
background:green;+
height:50px;+
}
#section{
++//+Intentionally+blank
}|code-block|syntax|javascript|695527|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/stevenng/quk37k0q/2/^0|U|9|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>Can you just update your CSS to not use z-index and apply the background color to the BODY tag?
<a href="https://jsfiddle.net/stevenng/quk37k0q/2/" rel="nofollow">JS Fiddle</a></p>

<pre><code>*{
margin:0;
padding:0;
}
body {
  background:yellow; 
}
#header{
width:100%; 
background:green; 
height:50px; 
}
#section{
  // Intentionally blank
}
</code></pre>


blocks|key|1334452|text|您不需要z-index和position，只需在#section中使用height:100%25和body、html|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1334453|或者如果您希望通过使用calc()在#section中使用height:calc(100%25+-+50px)|1334454|​|1334455|body,
html+{
++height:+100%25;
++margin:+0
}
#header+{
++width:+100%25;
++background:+green;
++height:+50px;
}
#section+{
++background:+yellow;
++height:+100%25+/*+or+-++height:calc(100%25+-+50px)+*/
}|code-block|syntax|javascript|1334456|<div+id="header">
++This+is+my+header!
</div>

<div+id="section">
++<a+href="#">Go+to+the+link</a>
</div>|1334457|1334458|请注意，z-index在#header中没有被定位|1334459|entityMap^0|4|7|C|8|O|8|Z|B|1B|4|1G|4|0|B|6|I|8|T|O|0|0|0|0|0|4|7|C|7|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1F|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|L|7|1H|8|@]|D|@]|E|$M|N]]|$1|Q|3|I|5|6|7|1I|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|U|$]]

<p>you don't need neither <code>z-index</code> and <code>position</code>, you can just use <code>height:100%</code> in <code>#section</code> along with <code>body</code>,<code>html</code></p>

<p>or if you wish you can use <code>calc()</code> in <code>#section</code> by using <code>height:calc(100% - 50px)</code></p>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body,
html {
  height: 100%;
  margin: 0
}
#header {
  width: 100%;
  background: green;
  height: 50px;
}
#section {
  background: yellow;
  height: 100% /* or -  height:calc(100% - 50px) */
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="header"&gt;
  This is my header!
&lt;/div&gt;

&lt;div id="section"&gt;
  &lt;a href="#"&gt;Go to the link&lt;/a&gt;
&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>Note that you had <code>z-index</code> in <code>#header</code> which wasn't being positioned </p>


<p>I have two <code>div</code>s, a <code>header</code> and a <code>section</code>, the <code>section</code> always occupies the entire screen and <code>header</code> only a small part.</p>

<p>Inside my <code>section</code> I have one link as you can see in the code below:</p>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>* {
  margin: 0;
  padding: 0;
}
#header {
  width: 100%;
  background: green;
  height: 50px;
  z-index: 1;
}
#section {
  background: yellow;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: hidden;
  float: left;
  z-index: -1;</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="header"&gt;This is my header&lt;/div&gt;
&lt;div id="section"&gt;
  &lt;br&gt;
  &lt;br&gt;
  &lt;br&gt;
  &lt;br&gt;&lt;a href="#"&gt;Go to the link&lt;/a&gt;
&lt;/div&gt;</code></pre>
</div>
</div>
</p>

<p>I need use <code>z-index</code> in my <code>header</code> because if I do not use, it does not appear, since the <code>section</code> covers the entire screen.</p>

<p>You can see the DEMO <a href="https://jsfiddle.net/quk37k0q/" rel="nofollow">HERE</a></p>

<p>Before I put the code in JSFiddle my problem was that I was not able to click on the link inside my <code>section</code>, but after putting the code in JSFiddle  the link is working.</p>

<p>Why did this happen? and how to solve it on my website?</p>


Problems with z-index with link

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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我有两个div，一个header和一个section，section总是占据整个屏幕，header只占一小部分。在我的section中，我有一个链接，您可以在下面的代码中看到：​* {  margin: 0;  padding: 0;}#header {  width: 100%;  background: green...

问带链接的z索引问题
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问带链接的z索引问题EN