jQuery1.8.0帮助文档
jQuery1.8.0帮助文档
  1. 速查表
  2. HTML5速查表
  3. 正则表达式速查表
  4. 核心
    1. selector
    2. context
    3. jQuery(selector,[context])
    4. get([index])
    5. jQuery(html,[ownerDocument])
    6. index([selector|element])
    7. jQuery(callback)
    8. data([key],[value])
    9. jQuery.holdReady(hold)
    10. jQuery.noConflict([extreme])
    11. removeData([name|list])
    12. each(callback)
    13. jQuery.data(element,[key],[value])
    14. size()
    15. queue(element,[queueName])
    16. length
    17. dequeue([queueName])
    18. clearQueue([queueName])
  5. 选择器
    1. #id
    2. element
    3. .class
    4. *
    5. :first
    6. selector1,selector2,selectorN
    7. :last
    8. ancestor descendant
    9. :not(selector)
    10. parent > child
    11. :even
    12. prev + next
    13. :odd
    14. prev ~ siblings
    15. :eq(index)
    16. :gt(index)
    17. :lt(index)
    18. :header
    19. :animated
    20. :focus
    21. [attribute^=value]
    22. :contains(text)
    23. :password
    24. [attribute$=value]
    25. :empty
    26. :radio
    27. [attribute*=value]
    28. :has(selector)
    29. :checkbox
    30. [selector1][selector2][selectorN]
    31. :parent
    32. :submit
    33. :nth-child
    34. :hidden
    35. :image
    36. :first-child
    37. :visible
    38. :reset
    39. :last-child
    40. [attribute]
    41. :button
    42. :only-child
    43. [attribute=value]
    44. :file
    45. :input
    46. [attribute!=value]
    47. :enabled
    48. :text
    49. :disabled
    50. :checked
    51. :selected
  6. CSS
    1. scrollTop([val])
    2. scrollLeft([val])
    3. height([val|fn])
    4. width([val|fn])
    5. innerHeight()
    6. innerWidth()
    7. css(name|pro|[,val|fn])
    8. outerHeight([options])
    9. offset([coordinates])
    10. outerWidth([options])
    11. position()
  7. Ajax
    1. jQuery.ajax(url,[settings])
    2. load(url,[data],[callback])
    3. jQuery.get(url,[data],[callback],[type])
    4. jQuery.ajaxSetup([options])
    5. jQuery.getJSON(url,[data],[callback])
    6. serialize()
    7. jQuery.getScript(url,[callback])
    8. serializeArray()
    9. jQuery.post(url,[data],[callback],[type])
    10. ajaxComplete(callback)
    11. ajaxError(callback)
    12. ajaxSend(callback)
    13. ajaxStart(callback)
    14. ajaxStop(callback)
    15. ajaxSuccess(callback)
  8. 工具
    1. jQuery.makeArray(obj)
    2. jQuery.map(array, callback)
    3. jQuery.inArray(val,arr,[from])
    4. jQuery.support
    5. jQuery.toArray()
    6. jQuery.browser
    7. jQuery.sub()
    8. jQuery.browser.version
    9. jQuery.when(deferreds)
    10. jQuery.boxModel
    11. jQuery.merge(first,second)
    12. jQuery.each(object,[callback])
    13. jQuery.unique(array)
    14. jQuery.extend([deep],target,object1,[objectN])
    15. jQuery.parseJSON(json)
    16. jQuery.grep(array,callback,[invert])
    17. jQuery.noop
    18. jQuery.proxy(function,context)
    19. jQuery.param(obj,[traditional])
    20. jQuery.contains(container, contained)
    21. jQuery.error(message)
    22. jQuery.isArray(obj)
    23. jQuery.isFunction(obj)
    24. jQuery.isEmptyObject(obj)
    25. jQuery.isPlainObject(obj)
    26. jQuery.isWindow(obj)
    27. jQuery.isNumeric(value)
    28. jQuery.type(obj)
    29. jQuery.trim(str)
  9. 筛选
    1. eq(index|-index)
    2. first()
    3. last()
    4. hasClass(class)
    5. filter(expr|obj|ele|fn)
    6. is(expr|obj|ele|fn)
    7. map(callback)
    8. has(expr|ele)
    9. not(expr|ele|fn)
    10. parentsUntil([exp|ele][,fil])
    11. slice(start, [end])
    12. prev([expr])
    13. children([expr])
    14. prevAll([expr])
    15. closest(expr,[con]|obj|ele)
    16. prevUntil([exp|ele][,fil])
    17. find(expr|obj|ele)
    18. siblings([expr])
    19. next([expr])
    20. add(expr|ele|html|obj[,con])
    21. nextAll([expr])
    22. andSelf()
    23. nextUntil([exp|ele][,fil])
    24. contents()
    25. parent([expr])
    26. end()
    27. parents([expr])
  10. 事件
    1. ready(fn)
    2. on(events,[selector],[data],fn)
    3. off(events,[selector],[fn])
    4. hover([over,]out)
    5. bind(type,[data],fn)
    6. keypress([[data],fn])
    7. toggle(fn, fn2, [fn3, fn4, ...])
    8. one(type,[data],fn)
    9. keyup([[data],fn])
    10. blur([[data],fn])
    11. trigger(type,[data])
    12. mousedown([[data],fn])
    13. change([[data],fn])
    14. triggerHandler(type,[data])
    15. mouseenter([[data],fn])
    16. click([[data],fn])
    17. unbind(type,[data|fn])
    18. mouseleave([[data],fn])
    19. dblclick([[data],fn])
    20. live(type,[data],fn)
    21. mousemove([[data],fn])
    22. error([[data],fn])
    23. die(type,[fn])
    24. mouseout([[data],fn])
    25. focus([[data],fn])
    26. delegate(sel,[type],[data],fn)
    27. mouseover([[data],fn])
    28. focusout([data],fn)
    29. undelegate([sel,[type],fn])
    30. mouseup([[data],fn])
    31. keydown([[data],fn])
    32. resize([[data],fn])
    33. scroll([[data],fn])
    34. select([[data],fn])
    35. submit([[data],fn])
    36. unload([[data],fn])
  11. 属性
    1. addClass(class|fn)
    2. text([val|fn])
    3. removeClass([class|fn])
    4. val([val|fn|arr])
    5. toggleClass(class|fn[,sw])
    6. html([val|fn])
    7. attr(name|pro|key,val|fn)
    8. removeAttr(name)
    9. prop(name|pro|key,val|fn)
    10. removeProp(name)
  12. 效果
    1. fadeOut([speed],[easing],[fn])
    2. fadeTo([[speed],opacity,[easing],[fn]])
    3. fadeToggle([speed,[easing],[fn]])
    4. animate(param,[spe],[e],[fn])
    5. show([speed,[easing],[fn]])
    6. stop([cle],[jum])
    7. hide([speed,[easing],[fn]])
    8. delay(duration,[queueName])
    9. slideDown([speed],[easing],[fn])
    10. jQuery.fx.off
    11. slideUp([speed,[easing],[fn]])
    12. jQuery.fx.interval
    13. slideToggle([speed],[easing],[fn])
    14. fadeIn([speed],[easing],[fn])
  13. 文档处理
    1. appendTo(content)
    2. prepend(content|fn)
    3. prependTo(content)
    4. after(content|fn)
    5. before(content|fn)
    6. insertAfter(content)
    7. insertBefore(content)
    8. wrap(html|ele|fn)
    9. unwrap()
    10. append(content|fn)
    11. wrapInner(html|ele|fn)
    12. wrapAll(html|ele)
    13. replaceWith(content|fn)
    14. replaceAll(selector)
    15. empty()
    16. remove([expr])
    17. detach([expr])
    18. clone([Even[,deepEven]])
  14. Deferred
    1. def.done(donCal,[donCal])
    2. def.fail(failCal)
    3. def.isRejected()
    4. def.isResolved()
    5. def.reject(args)
    6. def.rejectWith(context,[args])
    7. def.resolve(args)
    8. def.resolveWith(context,args)
    9. def.then(doneCal,failCal)
    10. def.progress([type],[target])
    11. def.pipe([donFil],[faiFil],[proFil])
    12. def.always(alwCal,[alwCal])
    13. def.notify(args)
    14. def.notifyWith(context,[args])
    15. def.state()
  15. Callbacks
    1. callbacks.fire(arguments)
    2. callbacks.fired()
    3. callbacks.fireWith([context][,args])
    4. callbacks.has(callback)
    5. callbacks.lock()
    6. callbacks.locked()
    7. callbacks.remove(callbacks)
    8. callbacks.add(callbacks)
    9. jQuery.callbacks(flags)
    10. callbacks.disable()
    11. callbacks.empty()
  16. 关于
    1. 关于jQuery API 文档
    2. 提交bug及获取更新
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length

2018-02-24 15:14 更新

返回值:Numberlength

V1.0概述

jQuery 对象中元素的个数。

这个函数的返回值与 jQuery 对象的'length' 属性一致。

示例

描述:

计算文档中所有图片数量

HTML 代码:
<img src="https://atts.w3cschool.cn/attachments/image/cimg/> <img src="test2.jpg"/>
jQuery 代码:
$("img").length;
结果:
2
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