blocks|key|870654|text|“马修说的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870655|看看这把小提琴http://jsfiddle.net/luckmattos/yp8HK/1/|offset|length|870656|JQUERY|870657|var+num+=+200;+//number+of+pixels+before+modifying+styles

$(window).bind('scroll',+function+()+{
++++if+($(window).scrollTop()+>+num)+{
++++++++$('.menu').addClass('fixed');
++++}+else+{
++++++++$('.menu').removeClass('fixed');
++++}
});|code-block|syntax|javascript|870658|希望能帮上忙，我用的是引导导航条。|870659|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/luckmattos/yp8HK/1/^0|0|7|13|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<p>Here is what @Matthew was talking about:</p>

<h2>Check this fiddle <a href="http://jsfiddle.net/luckmattos/yp8HK/1/">http://jsfiddle.net/luckmattos/yp8HK/1/</a></h2>

<h2>JQUERY</h2>

<pre><code>var num = 200; //number of pixels before modifying styles

$(window).bind('scroll', function () {
    if ($(window).scrollTop() &gt; num) {
        $('.menu').addClass('fixed');
    } else {
        $('.menu').removeClass('fixed');
    }
});
</code></pre>

<p>Hope it helps, I used bootstrap navbar.</p>


blocks|key|870760|text|使用jQuery|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870761|jQuery(window).scroll(function+()+{
+++++jQuery(".header-sticky").toggleClass('fixed',jQuery(window).scrollTop()+>+50);
});|code-block|syntax|javascript|870762|.fixed{
+++position:+fixed;
+++top:+0;
}|870763|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|M|8|@]|9|@]|A|$E|F]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<h1>Using jQuery</h1>
<pre class="lang-js prettyprint-override"><code>jQuery(window).scroll(function () {
     jQuery(&quot;.header-sticky&quot;).toggleClass('fixed',jQuery(window).scrollTop() &gt; 50);
});
</code></pre>
<pre class="lang-css prettyprint-override"><code>.fixed{
   position: fixed;
   top: 0;
}
</code></pre>


blocks|key|870569|text|以下是几个例子|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870570|在引导中，您可以使用navbar-fixed-top类。|offset|length|style|CODE|870571|<nav+class="navbar+navbar-default+navbar-fixed-top"+role="navigation">
++<div+class="container">
++++...
++</div>
</nav>|code-block|syntax|javascript|870572|请查看以下链接：|870573|固定到顶部：http://getbootstrap.com/components/#navbar-fixed-top|870574|修正Navbar示例：http://getbootstrap.com/examples/navbar-fixed-top/|870575|entityMap|0|LINK|mutability|MUTABLE|url|http://getbootstrap.com/components/#navbar-fixed-top|1|http://getbootstrap.com/examples/navbar-fixed-top/^0|0|A|G|0|0|0|6|1G|0|0|B|1E|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|Q|3|R|5|6|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|S|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

<p>Here are some few examples</p>

<p>With in bootstrap you can use <code>navbar-fixed-top</code> class. </p>

<pre><code>&lt;nav class="navbar navbar-default navbar-fixed-top" role="navigation"&gt;
  &lt;div class="container"&gt;
    ...
  &lt;/div&gt;
&lt;/nav&gt;
</code></pre>

<p>Have a look at following links:</p>

<p>Fixed to Top :  <a href="http://getbootstrap.com/components/#navbar-fixed-top" rel="nofollow">http://getbootstrap.com/components/#navbar-fixed-top</a></p>

<p>Fixed Navbar example : <a href="http://getbootstrap.com/examples/navbar-fixed-top/" rel="nofollow">http://getbootstrap.com/examples/navbar-fixed-top/</a></p>


blocks|key|1591525|text|引导带5(更新2021)|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1591526|引导5有一个sticky-top类，可用于在页面滚动时创建静态到固定的Navbar效果。|CODE|1591527|滚动后的引导5棒肚脐(简单粘顶)|1591528|滚动后引导5棒肚脐条(用IntersectionObserver动画)|1591529|Bootstrap+4(2018年更新)|1591530|词缀插件在启动4中被删除，因为CSS位置:粘滞完成类似的行为。然而，位置:粘性不会动画的肚脐风格的变化。为此，可以使用交集观测器。|1591531|参见这个问题的引导带4粘性肚脐|1591532|引导带3(原始答案)|1591533|下面是一个引导示例，一旦用户使用Bootstrap+3词缀插件滚动过顶部的标题，就将导航条附加到顶部。|1591534|https://codeply.com/p/HAQSABYqPY|1591535|entityMap|0|LINK|mutability|MUTABLE|url|https://codeply.com/p/Gq9DKl9zNY|1|https://codeply.com/p/wHQ6QdMkrV|2|https://stackoverflow.com/questions/42237406/animate-shrink-navbar-on-scroll-using-bootstrap-4/42250478#42250478|3^0|0|C|0|6|A|0|0|G|0|0|0|Z|1|0|0|K|0|0|0|F|2|0|0|A|0|0|0|W|3|0^^$0|@$1|2|3|4|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1E|8|@$9|1F|A|1G|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|1H|8|@]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|K|3|L|5|6|7|1L|8|@]|D|@$9|1M|A|1N|1|1O]]|E|$]]|$1|M|3|N|5|6|7|1P|8|@$9|1Q|A|1R|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1S|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1T|8|@]|D|@$9|1U|A|1V|1|1W]]|E|$]]|$1|S|3|T|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|20|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|21|8|@]|D|@$9|22|A|23|1|24]]|E|$]]|$1|Y|3|-4|5|6|7|25|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]|16|$5|11|12|13|E|$14|17]]|18|$5|11|12|13|E|$14|19]]|1A|$5|11|12|13|E|$14|X]]]]

<p><strong>Bootstrap 5 (update 2021)</strong></p>
<p>Bootstrap 5 has a <code>sticky-top</code> class that can be used to create a static-to-fixed Navbar effect when the page is scrolled.</p>
<p><a href="https://codeply.com/p/Gq9DKl9zNY" rel="nofollow noreferrer">Bootstrap 5 stick navbar after scrolling (simply sticky-top)</a><br>
<a href="https://codeply.com/p/wHQ6QdMkrV" rel="nofollow noreferrer">Bootstrap 5 stick navbar after scrolling (animate with IntersectionObserver)</a></p>
<p><strong>Bootstrap 4 (update 2018)</strong></p>
<p>The Affix plugin was removed in Bootstrap 4 since CSS position: sticky accomplishes similar behavior. However, position: sticky won't animate the changing of the navbar style. For this an intersection observer can be used.</p>
<p><a href="https://stackoverflow.com/questions/42237406/animate-shrink-navbar-on-scroll-using-bootstrap-4/42250478#42250478">See this question for Bootstrap 4 sticky navbar</a></p>
<p><strong>Bootstrap 3 (original answer)</strong></p>
<p>Here's a Bootstrap example that attaches the navbar to the top once the user has scrolled past the top header using the Bootstrap 3 Affix plugin..</p>
<p><a href="https://codeply.com/p/HAQSABYqPY" rel="nofollow noreferrer">https://codeply.com/p/HAQSABYqPY</a></p>


blocks|key|1591597|text|这里是我与jquery和一些非常简单的css结合在一起的一个真正的快速示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1591598|JS|1591599|$(window).on('scroll',+function(){
++++if($(window).scrollTop()>=95+&&+!$('nav').hasClass('fixed')){
++++++++$('nav').addClass('fixed');+
++++}
++++else+if($(window).scrollTop()<95+&&+$('nav').hasClass('fixed')){
+++++++$('nav').removeClass('fixed')+
++++}
});|code-block|syntax|javascript|1591600|CSS|1591601|.container+{
++height:+1800px;
}

.header+{
++text-align:+center;
}

nav+{
++background-color:+#efefef;
++border-top:+2px+solid+#666;
++border-bottom:+2px+solid+#666;
++padding:+15px;
++width:+100%25;
}
nav+ul+{
++margin:+0;
++padding:+0;
++list-style:+none;
}
nav+li+{
++display:+inline-block;
}

.fixed+{
++position:+fixed;
++top:+0;
++left:+0;
}|1591602|HTML|1591603|<div+class="container">
<div+class="header">
++<img+src="http://www.placehold.it/500x85"+alt=""+/>
<nav+role='navigation'>
++<ul>
++++<li><a+href="#">Home</a></li>
++++<li><a+href="#">About</a></li>
++++<li><a+href="#">Clients</a></li>
++++<li><a+href="#">Contact+Us</a></li>
++</ul>
</nav>++
</div>
</div>|1591604|entityMap|0|LINK|mutability|MUTABLE|url|http://codepen.io/Matthewnie/pen/ksKbh^0|X|4|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

<p>Here is a REAL <a href="http://codepen.io/Matthewnie/pen/ksKbh" rel="nofollow">quick example</a> I threw together with jquery and some very simple css.</p>

<p>JS</p>

<pre><code>$(window).on('scroll', function(){
    if($(window).scrollTop()&gt;=95 &amp;&amp; !$('nav').hasClass('fixed')){
        $('nav').addClass('fixed'); 
    }
    else if($(window).scrollTop()&lt;95 &amp;&amp; $('nav').hasClass('fixed')){
       $('nav').removeClass('fixed') 
    }
});
</code></pre>

<p>CSS</p>

<pre><code>.container {
  height: 1800px;
}

.header {
  text-align: center;
}

nav {
  background-color: #efefef;
  border-top: 2px solid #666;
  border-bottom: 2px solid #666;
  padding: 15px;
  width: 100%;
}
nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
nav li {
  display: inline-block;
}

.fixed {
  position: fixed;
  top: 0;
  left: 0;
}
</code></pre>

<p>HTML</p>

<pre><code>&lt;div class="container"&gt;
&lt;div class="header"&gt;
  &lt;img src="http://www.placehold.it/500x85" alt="" /&gt;
&lt;nav role='navigation'&gt;
  &lt;ul&gt;
    &lt;li&gt;&lt;a href="#"&gt;Home&lt;/a&gt;&lt;/li&gt;
    &lt;li&gt;&lt;a href="#"&gt;About&lt;/a&gt;&lt;/li&gt;
    &lt;li&gt;&lt;a href="#"&gt;Clients&lt;/a&gt;&lt;/li&gt;
    &lt;li&gt;&lt;a href="#"&gt;Contact Us&lt;/a&gt;&lt;/li&gt;
  &lt;/ul&gt;
&lt;/nav&gt;  
&lt;/div&gt;
&lt;/div&gt;
</code></pre>


blocks|key|1870459|text|下面是一个具有动态高度获取的滚动条的示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1870460|JS|1870461|您需要首先添加一个jQuery库文件。|1870462|​|1870463|这里是小提琴链接-+pawan/4+nr4coq/1/|offset|length|1870464|$(document).ready(function(){
++var+num+=+$(".header-class").offset().top;+
++$(window).bind('scroll',+function()+{+
++++if+($(window).scrollTop()+>+num)+{++
++++++$('.header-class').addClass('fixed');++
++++}+
++++else+{++
+++++$('.header-class').removeClass('fixed');++++
++++}+
++});
});|code-block|syntax|javascript|1870465|CSS|1870466|body+{
++margin:+0px;
++padding:+0px;
}

.nav-bar-white+{
++background-color:+#125456;
++width:+100%25;
}

.active-2+{
++float:+right;
++width:+49%25;
++text-align:+right;
}

.fixed+{
++position:+fixed;
++width:+100%25;
++top:+0;
}

h3+{
++color:+#fff;
}

.first+{
++background:+#000;
++width:+49%25;
++display:+inline-block;
++margin:+0px;
++padding:+0px;
++border:+1px+solid+#fff;
}

.first+p+{
++color:+#fff;
}

.second+{
++background:+#000;
++width:+49%25;
++display:+inline-block;
++margin:+0px;
++padding:+0px;
++border:+1px+solid+#fff;
}

.second+p+{
++color:+#fff;
}

ul+{
++list-style-type:+none;
++margin:+0;
++padding:+0;
++overflow:+hidden;
++background-color:+#300E06;
}

li+{
++float:+left;
}

li+a+{
++display:+block;
++color:+white;
++text-align:+center;
++padding:+14px+16px;
++text-decoration:+none;
}

li+a:hover+{
++background-color:+#000;
}|1870467|HTML|1870468|<ul+class="nav-bar-white">
++<li+class="active-1"><a+href="#home">Company+Logo</a></li>
</ul>

<ul+class="header-class">
++<li><a+class="active"+href="#home">Home</a></li>
++<li><a+href="#news">News</a></li>
++<li><a+href="#contact">Contact</a></li>
++<li><a+href="#about">About</a></li>
</ul>
<div>
++<div+class="first">
++++<h3>
What+is+Lorem+Ipsum?
</h3>
++++<p>Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It
++++++has+survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++++<p>
++++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++++</p>
++++</p>
++</div>
++<div+class="second">
++++<h3>
What+is+Lorem+Ipsum?
</h3>
++++<p>
++++++<p>
++++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++++</p>
++++++<p>
++++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++++</p>
++++</p>
++</div>
</div>

<div+class="first">
++<h3>
What+is+Lorem+Ipsum?
</h3>
++<p>Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It
++++has+survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++<p>
++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++</p>
++</p>
</div>
<div+class="second">
++<h3>
What+is+Lorem+Ipsum?
</h3>
++<p>
++++<p>
++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++</p>
++++<p>
++++++Lorem+Ipsum+is+simply+dummy+text+of+the+printing+and+typesetting+industry.+Lorem+Ipsum+has+been+the+industry's+standard+dummy+text+ever+since+the+1500s,+when+an+unknown+printer+took+a+galley+of+type+and+scrambled+it+to+make+a+type+specimen+book.+It+has
++++++survived+not+only+five+centuries,+but+also+the+leap+into+electronic+typesetting,+remaining+essentially+unchanged.+It+was+popularised+in+the+1960s+with+the+release+of+Letraset+sheets+containing+Lorem+Ipsum+passages,+and+more+recently+with+desktop
++++++publishing+software+like+Aldus+PageMaker+including+versions+of+Lorem+Ipsum
++++</p>
++</p>
</div>
</div>|1870469|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/CV_pawan/4nr4codq/1/^0|0|0|0|0|A|H|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@$J|1B|K|1C|1|1D]]|A|$]]|$1|L|3|M|5|N|7|1E|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|1G|8|@]|9|@]|A|$O|P]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|A|$]]|$1|W|3|X|5|N|7|1I|8|@]|9|@]|A|$O|P]]|$1|Y|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

<p>Here is an example of sticky navigation bar On-Scroll with dynamic height getting<h2>JS</h2>
You need to add a jQuery Library file first.</p>

<p>Here is fiddle link-
<a href="https://jsfiddle.net/CV_pawan/4nr4codq/1/" rel="nofollow noreferrer">https://jsfiddle.net/CV_pawan/4nr4codq/1/</a></p>

<pre><code>$(document).ready(function(){
  var num = $(".header-class").offset().top; 
  $(window).bind('scroll', function() { 
    if ($(window).scrollTop() &gt; num) {  
      $('.header-class').addClass('fixed');  
    } 
    else {  
     $('.header-class').removeClass('fixed');    
    } 
  });
});
</code></pre>

<h1>CSS</h1>

<pre><code>body {
  margin: 0px;
  padding: 0px;
}

.nav-bar-white {
  background-color: #125456;
  width: 100%;
}

.active-2 {
  float: right;
  width: 49%;
  text-align: right;
}

.fixed {
  position: fixed;
  width: 100%;
  top: 0;
}

h3 {
  color: #fff;
}

.first {
  background: #000;
  width: 49%;
  display: inline-block;
  margin: 0px;
  padding: 0px;
  border: 1px solid #fff;
}

.first p {
  color: #fff;
}

.second {
  background: #000;
  width: 49%;
  display: inline-block;
  margin: 0px;
  padding: 0px;
  border: 1px solid #fff;
}

.second p {
  color: #fff;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #300E06;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: #000;
}
</code></pre>

<h1>HTML</h1>

<pre><code>&lt;ul class="nav-bar-white"&gt;
  &lt;li class="active-1"&gt;&lt;a href="#home"&gt;Company Logo&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;

&lt;ul class="header-class"&gt;
  &lt;li&gt;&lt;a class="active" href="#home"&gt;Home&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href="#news"&gt;News&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href="#contact"&gt;Contact&lt;/a&gt;&lt;/li&gt;
  &lt;li&gt;&lt;a href="#about"&gt;About&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;div&gt;
  &lt;div class="first"&gt;
    &lt;h3&gt;
What is Lorem Ipsum?
&lt;/h3&gt;
    &lt;p&gt;Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
      has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
      &lt;p&gt;
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      &lt;/p&gt;
    &lt;/p&gt;
  &lt;/div&gt;
  &lt;div class="second"&gt;
    &lt;h3&gt;
What is Lorem Ipsum?
&lt;/h3&gt;
    &lt;p&gt;
      &lt;p&gt;
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      &lt;/p&gt;
      &lt;p&gt;
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
        survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
        publishing software like Aldus PageMaker including versions of Lorem Ipsum
      &lt;/p&gt;
    &lt;/p&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;div class="first"&gt;
  &lt;h3&gt;
What is Lorem Ipsum?
&lt;/h3&gt;
  &lt;p&gt;Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum
    &lt;p&gt;
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    &lt;/p&gt;
  &lt;/p&gt;
&lt;/div&gt;
&lt;div class="second"&gt;
  &lt;h3&gt;
What is Lorem Ipsum?
&lt;/h3&gt;
  &lt;p&gt;
    &lt;p&gt;
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    &lt;/p&gt;
    &lt;p&gt;
      Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
      survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
      publishing software like Aldus PageMaker including versions of Lorem Ipsum
    &lt;/p&gt;
  &lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
</code></pre>


blocks|key|870752|text|对于jQuery用户，请查看：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870753|​|870754|var+yourNavigation+=+$(".nav");
++++stickyDiv+=+"sticky";
++++yourHeader+=+$('.header').height();

$(window).scroll(function()+{
++if(+$(this).scrollTop()+>+yourHeader+)+{
++++yourNavigation.addClass(stickyDiv);
++}+else+{
++++yourNavigation.removeClass(stickyDiv);
++}
});|code-block|syntax|javascript|870755|/*+google+font+*/


body+{
++text-align:center;
++margin:0;
++padding:0;
++font-family:+'Montserrat',+sans-serif;
++color:rgba(0,0,0,0.87);
}

.header+{
++width:100%25;
++height:100px;
++font-size:50px;
++line-height:100px;
++text-transform:uppercase;
++font-weight:bold;
}

.nav+{
++width:100%25;
++height:60px;+
++font-size:20px;
++line-height:60px;+
++background:#ff5252;
++color:#fff;
++position:relative;
++margin-bottom:60px;
++z-index:3;
++text-transform:uppercase;
}

.content+{
++width:640px;
++height:500vh;
++font-size:14px;
++padding-top:100px;
++margin:0+auto+0;
}

.sticky+{
++position:fixed;
++top:0;
}

p+{
++line-height:2;
}|870756|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script+src="sticky.js"></script>
<link+rel="stylesheet"+type="text/css"+href="sticky.css">

<body>
++++<header+class='header'>Header</header>
++++<div+class='nav'>Navigation</div>
++++<div+class='content'>
++++++++<h1>Simple+sticky+navigation+bar</h1>
++++++++<p>Using+jQuery+we+add+(or+remove)+a+sticky+class+to+the+navigation+bar.+The+sticky+class+fixes+the+position.
++++++++</p>
++++++++<p>This+happens+whenever+the+page+is+scrolled.+We+check+to+see+how+far+down+the+page+has+scrolled,+if+this
++++++++++++number+is+greater+than+the+height+of+the+header,+we+add+the+sticky+class+to+the+navigation.</p>
++++++++<p>You+can+already+achieve+this+effect+using+only+CSS+with+<b>position:+sticky;</b>+but+it's+not+supported+by
++++++++++++many+browsers+at+the+moment.</p>
++++</div>
</body>|870757|870758|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|K|3|L|5|F|7|T|8|@]|9|@]|A|$G|H]]|$1|M|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|O|$]]

<p>For jQuery users, check out :</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var yourNavigation = $(".nav");
    stickyDiv = "sticky";
    yourHeader = $('.header').height();

$(window).scroll(function() {
  if( $(this).scrollTop() &gt; yourHeader ) {
    yourNavigation.addClass(stickyDiv);
  } else {
    yourNavigation.removeClass(stickyDiv);
  }
});</code></pre>
<pre class="snippet-code-css lang-css prettyprint-override"><code>/* google font */


body {
  text-align:center;
  margin:0;
  padding:0;
  font-family: 'Montserrat', sans-serif;
  color:rgba(0,0,0,0.87);
}

.header {
  width:100%;
  height:100px;
  font-size:50px;
  line-height:100px;
  text-transform:uppercase;
  font-weight:bold;
}

.nav {
  width:100%;
  height:60px; 
  font-size:20px;
  line-height:60px; 
  background:#ff5252;
  color:#fff;
  position:relative;
  margin-bottom:60px;
  z-index:3;
  text-transform:uppercase;
}

.content {
  width:640px;
  height:500vh;
  font-size:14px;
  padding-top:100px;
  margin:0 auto 0;
}

.sticky {
  position:fixed;
  top:0;
}

p {
  line-height:2;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;script src="sticky.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" type="text/css" href="sticky.css"&gt;

&lt;body&gt;
    &lt;header class='header'&gt;Header&lt;/header&gt;
    &lt;div class='nav'&gt;Navigation&lt;/div&gt;
    &lt;div class='content'&gt;
        &lt;h1&gt;Simple sticky navigation bar&lt;/h1&gt;
        &lt;p&gt;Using jQuery we add (or remove) a sticky class to the navigation bar. The sticky class fixes the position.
        &lt;/p&gt;
        &lt;p&gt;This happens whenever the page is scrolled. We check to see how far down the page has scrolled, if this
            number is greater than the height of the header, we add the sticky class to the navigation.&lt;/p&gt;
        &lt;p&gt;You can already achieve this effect using only CSS with &lt;b&gt;position: sticky;&lt;/b&gt; but it's not supported by
            many browsers at the moment.&lt;/p&gt;
    &lt;/div&gt;
&lt;/body&gt;</code></pre>
</div>
</div>
</p>


<p>I'm currently building a site for myself, and I found this really awesome effect on multiple sites where the navbar is below an image, but when you scroll past it, it sticks to the top.</p>

<p><a href="http://www.littleco.com/" rel="nofollow">Example</a></p>

<p>How can I achieve this? Also, how can I achieve an effect similar to the one on <a href="http://riotdesign.eu/en/" rel="nofollow">this website with a similar navbar style</a>?</p>


Sticky NavBar onScroll?

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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我目前正在为自己建立一个网站，我发现这个非常棒的效果在多个网站上，在一个图片下面的导航栏，但当你滚动它，它停留在顶部。我怎样才能做到这一点？此外，如何实现类似于上的效果？

问粘稠的NavBar onScroll？
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