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当我滚动div #3
寻找它的内部div,我想冻结div id 2 ...我该怎么做?如何冻结div滚动时检查内部的div
<div id='1' style="height:15%; border:1px solid black">Questions</div>
<div id='2' style="height:30%; border:1px solid black">Freeze this</div>
<div id='3' style="height:55%; border:1px solid black">Scroll this
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
<div class='innerDiv' style="border:1px solid black;height:50px">a</div>
</div>
如何冻结时滚动检查的
检查[jQuery:修复当浏览器滚动到div](http://stackoverflow.com/questions/8644248/jquery-fix-div-when-browser-scrolls-to-it) – Mohammad