原生js实现吸顶效果

实现思路如下：

1. div初始居普通文档流中

2. 给window添加scroll事件（可事件节流），获取div的offset的top值，滚动时scrollTop值和top比较，当到达top时给div添加一个fixed的class使其固定

3. 向上滚动时当到达div初始top时则删除fixed的class，此时div又回到普通文档流中

4. fixed样式非IE6浏览器使用position:fixed，IE6使用position:absolute和IE expression

效果图：

代码如下：

 
 
 
  * {
   margin: 0;
   padding: 0;
  }
  #div1 {
   width: 100%;
   height: 50px;
   background: skyblue;
  }
 
 


 
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