### 返回值:IntegerscrollTop([val])
### 概述
获取匹配元素相对滚动条顶部的偏移。
此方法对可见和隐藏元素均有效。
### 参数
#### **val**String, Number*V1.2.6*
设定垂直滚动条值
### 示例
#### 无参数描述:
获取第一段相对滚动条顶部的偏移
##### HTML 代码:
~~~
<p>Hello</p><p>2nd Paragraph</p>
~~~
##### jQuery 代码:
~~~
var p = $("p:first");
$("p:last").text( "scrollTop:" + p.scrollTop() );
~~~
##### 结果:
~~~
<p>Hello</p><p>scrollTop: 0</p>
~~~
#### 参数val 描述:
设置相对滚动条顶部的偏移
##### jQuery 代码:
~~~
$("div.demo").scrollTop(300);
~~~
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