### 返回值:jQueryprev(*[expr]*)
### 概述
取得一個包含匹配的元素集合中每一個元素緊鄰的前一個同輩元素的元素集合。
可以用一個可選的表達式進行篩選。只有緊鄰的同輩元素會被匹配到，而不是前面所有的同輩元素。
### 參數
#### **expr****String*V1.0*
用于篩選前一個同輩元素的表達式
### 示例
#### 描述:
找到每個段落緊鄰的前一個同輩元素。
##### HTML 代碼:
~~~
<p>Hello</p><div><span>Hello Again</span></div><p>And Again</p>
~~~
##### jQuery 代碼:
~~~
$("p").prev()
~~~
##### 結果:
~~~
[ <div><span>Hello Again</span></div> ]
~~~
#### 描述:
找到每個段落緊鄰的前一個同輩元素中類名為selected的元素。
##### HTML 代碼:
~~~
<div><span>Hello</span></div><p class="selected">Hello Again</p><p>And Again</p>
~~~
##### jQuery 代碼:
~~~
$("p").prev(".selected")
~~~
##### 結果:
~~~
[ <p class="selected">Hello Again</p> ]
~~~
- 速查表
- 核心
- jQuery(selector,[context])
- jQuery(html,[ownerDocument])
- jQuery(callback)
- jQuery.holdReady(hold)
- each(callback)
- size()
- length
- selector
- context
- get([index])
- index([selector|element])
- data([key],[value])
- removeData([name|list])
- jQuery.data(element,[key],[value])
- queue(element,[queueName])
- dequeue([queueName])
- clearQueue([queueName])
- jQuery.noConflict([extreme])
- 選擇器
- #id
- element
- .class
- *
- selector1,selector2,selectorN
- ancestor descendant
- parent > child
- prev + next
- prev ~ siblings
- :first
- :last
- :not(selector)
- :even
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- :eq(index)
- :gt(index)
- :lt(index)
- :header
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- :empty
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- [selector1][selector2][selectorN]
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- :file
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- :selected
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- eq(index|-index)
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- filter(expr|obj|ele|fn)
- is(expr|obj|ele|fn)
- map(callback)
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- closest(expr,[con]|obj|ele)
- find(expr|obj|ele)
- next([expr])
- nextAll([expr])
- nextUntil([exp|ele][,fil])
- parent([expr])
- parents([expr])
- parentsUntil([exp|ele][,fil])
- prev([expr])
- prevAll([expr])
- prevUntil([exp|ele][,fil])
- siblings([expr])
- add(expr|ele|html|obj[,con])
- andSelf()
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- 文檔處理
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- remove([expr])
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- clone([Even[,deepEven]])
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- 事件
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- one(type,[data],fn)
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- delegate(sel,[type],[data],fn)
- undelegate([sel,[type],fn])
- hover([over,]out)
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- blur([[data],fn])
- change([[data],fn])
- click([[data],fn])
- dblclick([[data],fn])
- error([[data],fn])
- focus([[data],fn])
- focusout([data],fn)
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- unload([[data],fn])
- 效果
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- slideDown([speed],[easing],[fn])
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- Deferred
- def.done(donCal,[donCal])
- def.fail(failCal)
- def.isRejected()
- def.isResolved()
- def.reject(args)
- def.rejectWith(context,[args])
- def.resolve(args)
- def.resolveWith(context,args)
- def.then(doneCal,failCal)
- def.progress([type],[target])
- def.pipe([donFil],[faiFil],[proFil])
- def.always(alwCal,[alwCal])
- def.notify(args)
- def.notifyWith(context,[args])
- def.state()
- Callbacks
- callbacks.add(callbacks)
- callbacks.disable()
- callbacks.empty()
- callbacks.fire(arguments)
- callbacks.fired()
- callbacks.fireWith([context][,args])
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- jQuery.callbacks(flags)
- 關于
- 關于jQuery API 文檔
- 提交bug及獲取更新
- 其它
- HTML5速查表
- 正則表達式速查表