### 返回值:Object{top,left}offset([coordinates])
### 概述
獲取匹配元素在當前視口的相對偏移。
返回的對象包含兩個整型屬性：top 和 left。此方法只對可見元素有效。
### 參數
#### **coordinates**Object{top,left}, function(index, coords) *V1.2*
一個對象，必須包含top和left屬性，作為元素的新坐標。這個參數也可以是一個返回一對坐標的函數，函數的第一個參數是元素的索引，第二個參數是當前的坐標。
### 示例
#### 無參數描述:
獲取第二段的偏移
##### HTML 代碼:
~~~
<p>Hello</p><p>2nd Paragraph</p>
~~~
##### jQuery 代碼:
~~~
var p = $("p:last");
var offset = p.offset();
p.html( "left: " + offset.left + ", top: " + offset.top );
~~~
##### 結果:
~~~
<p>Hello</p><p>left: 0, top: 35</p>
~~~
#### 參數coordinates 描述:
獲取第二段的偏移
##### HTML 代碼:
~~~
<p>Hello</p><p>2nd Paragraph</p>
~~~
##### jQuery 代碼:
~~~
$("p:last").offset({ top: 10, left: 30 });
~~~
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