### 返回值:Object{top,left}position()
### *V1.2*概述
获取匹配元素相对父元素的偏移。
返回的对象包含两个整型属性：top 和 left。为精确计算结果，请在补白、边框和填充属性上使用像素单位。此方法只对可见元素有效。
### 示例
#### 描述:
获取第一段的偏移
##### HTML 代码:
~~~
<p>Hello</p><p>2nd Paragraph</p>
~~~
##### jQuery 代码:
~~~
var p = $("p:first");
var position = p.position();
$("p:last").html( "left: " + position.left + ", top: " + position.top );
~~~
##### 结果:
~~~
<p>Hello</p><p>left: 15, top: 15</p>
~~~
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