本文主要来学习一下javascript插件--滚动监听。
1、案例
滚动监听插件可以根据滚动条的位置自动更新所对应的导航标记。你可以试试滚动这个页面，看看左侧导航的变化。
先把实现的代码上了，你可以通过测试代码先来看看效果。
Bootstrap @fat
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three
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用法1--通过data属性
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通过为需要监听的页面元素（一般是）不过在上面添加在了Div上面，你可以自己看看代码就明白了。然后给div添加属性data-spy="scroll"就可很轻松的为顶部导航条添加滚动监听功能。然后为其添加data-target属性，此属性的值为任何Bootstrap中.nav组件的父元素的ID或class。
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导航链接地址必须有对应的目标
导航条内的链接地址必须有对应的页面元素具有同样的ID值。
用法2--通过JavaScript
通过JavaScript启动滚动监听：
通过将样式类为scrollspy-example的div，去掉它的data-target属性。这样同样可以进行鼠标滚轮的切换。
2、方法
.scrollspy('refresh')
使用滚动监听插件时，每当页面中从DOM中增加或删除页面元素时，都需要调用此方法以，如下：
3、选项
可以将选项通过data属性或JavaScript传递。对于data属性，需要将选项名称放到data-之后，例如data-offset=""。
4、事件
最后注意:针对滚动监听的内容当然要添加滚动条，也就是要预先添加样式
给与Div内容一定的高度。
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