blocks|key|895865|text|查看链接到的页面的源代码。解决方案包括更改为固定在用户上的位置，向下滚动到菜单的顶部边缘，到达屏幕的顶部边缘(这是通过侦听scroll事件完成的)。首先(当页面被送达时)菜单没有固定的位置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|895866|编辑:或者更好的..。下面是只执行http://twitter.github.com/bootstrap/javascript.html#affix的脚本;)|895867|entityMap|0|LINK|mutability|MUTABLE|url|http://twitter.github.com/bootstrap/javascript.html#affix^0|1P|6|0|H|1L|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Checkout the source for the page you've linked to. The solution involves changing to position fixed upon user scroll down just enough to top edge of menu reach top edge of the screen (that's done by listening to <code>scroll</code> events). Initialy (when page is served) the menu doesn't have position fixed.

Edit:
Or better yet... here's script that will do just that <a href="http://twitter.github.com/bootstrap/javascript.html#affix" rel="nofollow">http://twitter.github.com/bootstrap/javascript.html#affix</a> ;)

blocks|key|893842|text|您需要侦听每个滚动事件，并在元素滚动时更改元素的位置，或者在阈值后更改为fixed，或者持续更新：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|893843|var+newPos+=+Math.max(+startPosition,+scrollTop+%2B+scrollOffset)|code-block|syntax|javascript|893844|entityMap^0|10|5|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'd need to listen to every scroll event, and change the position of the element as it scrolls, either changing to <code>fixed</code> after a threshold, or continuously updating:

<pre><code>var newPos = Math.max( startPosition, scrollTop + scrollOffset)
</code></pre>

blocks|key|1328000|text|你看起来像这样吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1328001|见演示|offset|length|1328002|JS代码：|style|BOLD|1328003|++++++++var+ns+=+(navigator.appName.indexOf("Netscape")+!=+-1);
++++++++var+d+=+document;
++++++++function+JSFX_FloatDiv(id,+sx,+sy)
++++++++{
++++++++++++var+el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
++++++++++++var+px+=+document.layers+?+""+:+"px";
++++++++++++window[id+%2B+"_obj"]+=+el;
++++++++++++if(d.layers)el.style=el;
++++++++++++el.cx+=+el.sx+=+sx;el.cy+=+el.sy+=+sy;
++++++++++++el.sP=function(x,y){this.style.left=x%2Bpx;this.style.top=y%2Bpx;};
++++++++
++++++++++++el.floatIt=function()
++++++++++++{
++++++++++++++++var+pX,+pY;
++++++++++++++++pX+=+(this.sx+>=+0)+?+0+:+ns+?+innerWidth+:+
++++++++++++++++document.documentElement+&&+document.documentElement.clientWidth+?+
++++++++++++++++document.documentElement.clientWidth+:+document.body.clientWidth;
++++++++++++++++pY+=+ns+?+pageYOffset+:+document.documentElement+&&+document.documentElement.scrollTop+?+
++++++++++++++++document.documentElement.scrollTop+:+document.body.scrollTop;
++++++++++++++++if(this.sy<0)+
++++++++++++++++pY+%2B=+ns+?+innerHeight+:+document.documentElement+&&+document.documentElement.clientHeight+?+
++++++++++++++++document.documentElement.clientHeight+:+document.body.clientHeight;
++++++++++++++++this.cx+%2B=+(pX+%2B+this.sx+-+this.cx)/8;this.cy+%2B=+(pY+%2B+this.sy+-+this.cy)/8;
++++++++++++++++this.sP(this.cx,+this.cy);
++++++++++++++++setTimeout(this.id+%2B+"_obj.floatIt()",+40);
++++++++++++}
++++++++++++return+el;
++++++++}|code-block|syntax|javascript|1328004|HTML:|1328005|<div+id="main">
++++<div+id="divTopLeft"+style="position:absolute">
++++++++<script>JSFX_FloatDiv("divTopLeft",+10,30).floatIt();</script>
++++++++<ul>
++++++++++++<li+id="img1">Image+1</li>
++++++++++++<li+id="img2">Image+2</li>
++++++++++++<li+id="img3">Image+3</li>
++++++++++++<li+id="img4">Image+4</li>
++++++++</ul>
++++</div>
</div>|1328006|CSS:|1328007|++++#main+{
++++++++width:+1280px;
++++++++height:720px;
++++++++background:+url(http://www.designworks.com.pk/example/background/images/1.jpg)+left+top+no-repeat;
++++++++margin:+0;
++++++++position:relative;
++++++++z-index:2;
++++}
++++ul+{+margin:20px;+display:inline-block;+}
++++ul+li+{+cursor:pointer;+list-style-type:+none;+color:+#fff;+background:#000;+border:1px+solid+#fff;+font-size:16px;+font-weight:+bold;+padding:+5px;+margin:2px+0+0+0;++}
++++ul+li#img1+{+background:#F90;+}|1328008|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/KF29z/^0|0|0|3|0|0|0|5|0|0|0|5|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|F|3|G|5|6|7|19|8|@$D|1A|E|1B|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|1C|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1D|8|@$D|1E|E|1F|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1G|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|1H|8|@$D|1I|E|1J|H|I]]|9|@]|A|$]]|$1|U|3|V|5|L|7|1K|8|@]|9|@]|A|$M|N]]|$1|W|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

Are you looking something like this
<h2><a href="http://jsfiddle.net/KF29z/" rel="nofollow noreferrer">SEE DEMO</a></h2>
JS CODE:
<pre><code> var ns = (navigator.appName.indexOf(&quot;Netscape&quot;) != -1);
 var d = document;
 function JSFX_FloatDiv(id, sx, sy)
 {
 var el=d.getElementById?d.getElementById(id):d.all?d.all[id]:d.layers[id];
 var px = document.layers ? &quot;&quot; : &quot;px&quot;;
 window[id + &quot;_obj&quot;] = el;
 if(d.layers)el.style=el;
 el.cx = el.sx = sx;el.cy = el.sy = sy;
 el.sP=function(x,y){this.style.left=x+px;this.style.top=y+px;};
 
 el.floatIt=function()
 {
 var pX, pY;
 pX = (this.sx &gt;= 0) ? 0 : ns ? innerWidth : 
 document.documentElement &amp;&amp; document.documentElement.clientWidth ? 
 document.documentElement.clientWidth : document.body.clientWidth;
 pY = ns ? pageYOffset : document.documentElement &amp;&amp; document.documentElement.scrollTop ? 
 document.documentElement.scrollTop : document.body.scrollTop;
 if(this.sy&lt;0) 
 pY += ns ? innerHeight : document.documentElement &amp;&amp; document.documentElement.clientHeight ? 
 document.documentElement.clientHeight : document.body.clientHeight;
 this.cx += (pX + this.sx - this.cx)/8;this.cy += (pY + this.sy - this.cy)/8;
 this.sP(this.cx, this.cy);
 setTimeout(this.id + &quot;_obj.floatIt()&quot;, 40);
 }
 return el;
 }
</code></pre>
HTML:
<pre><code>&lt;div id=&quot;main&quot;&gt;
 &lt;div id=&quot;divTopLeft&quot; style=&quot;position:absolute&quot;&gt;
 &lt;script&gt;JSFX_FloatDiv(&quot;divTopLeft&quot;, 10,30).floatIt();&lt;/script&gt;
 &lt;ul&gt;
 &lt;li id=&quot;img1&quot;&gt;Image 1&lt;/li&gt;
 &lt;li id=&quot;img2&quot;&gt;Image 2&lt;/li&gt;
 &lt;li id=&quot;img3&quot;&gt;Image 3&lt;/li&gt;
 &lt;li id=&quot;img4&quot;&gt;Image 4&lt;/li&gt;
 &lt;/ul&gt;
 &lt;/div&gt;
&lt;/div&gt;
</code></pre>
CSS:
<pre><code> #main {
 width: 1280px;
 height:720px;
 background: url(http://www.designworks.com.pk/example/background/images/1.jpg) left top no-repeat;
 margin: 0;
 position:relative;
 z-index:2;
 }
 ul { margin:20px; display:inline-block; }
 ul li { cursor:pointer; list-style-type: none; color: #fff; background:#000; border:1px solid #fff; font-size:16px; font-weight: bold; padding: 5px; margin:2px 0 0 0; }
 ul li#img1 { background:#F90; }
 
</code></pre>

blocks|key|1328028|text|试试position:+fixed|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1328029|http://jsfiddle.net/FlameTrap/mfyAc/|blockquote|1328030|**+编辑+**|BOLD|1328031|试试这个：|1328032|http://jsfiddle.net/FlameTrap/Wqb3g/1/|1328033|entityMap|0|LINK|mutability|MUTABLE|url|1^0|2|F|0|0|10|0|0|3|2|0|0|0|12|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|I|3|J|5|6|7|14|8|@$9|15|A|16|B|K]]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@]|D|@]|E|$]]|$1|N|3|O|5|H|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|P|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|G]]|W|$5|S|T|U|E|$V|O]]]]

Try <code>position: fixed</code>:

<blockquote>
 <a href="http://jsfiddle.net/FlameTrap/mfyAc/" rel="nofollow">http://jsfiddle.net/FlameTrap/mfyAc/</a>
</blockquote>

** EDIT **

Try this:

<blockquote>
 <a href="http://jsfiddle.net/FlameTrap/Wqb3g/1/" rel="nofollow">http://jsfiddle.net/FlameTrap/Wqb3g/1/</a>
</blockquote>

How to implement a sidebar, which is positioned somewhere at the page and when user scrolls page down, it changes positioning and scrolls with the main content, always remaining visible?

Here is an <a href="http://twitter.github.com/bootstrap/components.html" rel="nofollow">example</a> (scroll down, please)

<hr>

Oh dear! I just had to specify the following style (which wasn't too obvious for me):

<pre><code>.affix {
 position: fixed;
}
</code></pre>

And, of course, to add jQuery:

<pre><code>$('.leftnav').affix();
</code></pre>

Huge thanks to everyone, who tried to help me!

Sidebar which scrolls with the main content

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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