### 返回值:Objectoffset([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，以像素計。此方法只對可見元素有效。
### 參數
#### **coordinates{top,left}**Object*V1.4*
必需。規定以像素計的 top 和 left 坐標。
可能的值：
- 值對，比如 {top:100,left:0}
- 帶有 top 和 left 屬性的對象
#### **function(index,coords)**function*V1.4*
規定返回被選元素新偏移坐標的函數。
- index - 可選。接受選擇器的 index 位置
- oldvalue - 可選。接受選擇器的當前坐標
### 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 });
~~~
- 速查表
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