jQuery1.4 API中文参考指南 - length - 零基础学JQUERY

返回值:Numberlength

概述

jQuery 对象中元素的个数。

当前匹配的元素个数。 与size() 返回相同的值。

示例

描述:

计算文档中所有图片数量

HTML 代码:

<img src="test1.jpg"/> <img src="test2.jpg"/>

jQuery 代码:

$("img").length;

结果:

目录索引

»速查表(回到API首页)

输入要查找的关键字：

#id *.class :animated :button :checkbox :checked :contains :disabled :empty :enabled :eq :even :file :first-child :first :gt :has :header :hidden :hidden :image :input :last-child :last :lt :not :nth-child :odd :only-child :parent :password :radio :reset :selected :submit :text :visible [attrSel1][attrSel2][attrSelN][attribute!=value][attribute$=value][attribute*=value][attribute=value][attribute]add(expr, [context])addClass(class)addClass(function(index, class))after(content)after(function)ajaxComplete(callback)ajaxError(callback)ajaxSend(callback)ajaxStart(callback)ajaxStop(callback)ajaxSuccess(callback)ancestor descendant andSelf()animate(param,[dur],[e],[fn])animate(params, options)append(content)append(function(index, html))appendTo(content)attr(key, fn)attr(key, value)attr(name)attr(properties)before(content)before(function)bind(type, [data], fn)blur()blur(fn)change()change(fn)children([expr])clearQueue([queueName])click()click(fn)clone()clone(true)closest([expr])contents()context css(name)css(name, function(index, value))css(name, value)css(properties)data([name])data(name, value)data(obj)dblclick()dblclick(fn)delay(duration, [queueName])dequeue(name)detach([expr])die([type], [fn])each(callback)element empty()end()eq(index)error()error(fn)fadeIn(speed, [callback])fadeOut(speed, [callback])fadeTo(speed, opacity, [fn])filter(expr)filter(fn)find(expr)first()focus()focus(fn)focusin( [fn] )focusout( [fn] )get()get(index)has(expr)hasClass(class)height()height(val)hide()hide(speed, [callback])hover(over, out)html()html(function(index, html))html(val)index(subject)innerHeight()innerWidth()insertAfter(content)insertBefore(content)is(expr)jQuery()jQuery(callback)jQuery(elements)jQuery(expr, [context])jQuery(html, [ownerDoc])jQuery(html, props)jQuery.ajax([options])jQuery.ajaxSetup([options])jQuery.boxModel jQuery.browser.version jQuery.browser jQuery.contains(container, contained)jQuery.data([element], [key])jQuery.data(element, key, val)jQuery.each(object, [callback])jQuery.error(message)jQuery.extend([d],tgt,obj1,[objN])jQuery.extend(object)jQuery.fn.extend(object)jQuery.fx.off jQuery.get(url, [data], [fn], [type])jQuery.getJSON(url, [data], [fn])jQuery.getScript(url, [callback])jQuery.grep(array, fn, [invert])jQuery.inArray(value, array)jQuery.isArray(obj)jQuery.isEmptyObject(obj)jQuery.isFunction(obj)jQuery.isPlainObject(obj)jQuery.makeArray(obj)jQuery.map(array, callback)jQuery.merge(first, second)jQuery.noConflict()jQuery.noConflict(extreme)jQuery.noop jQuery.param(obj, [traditional])jQuery.parseJSON(json)jQuery.post(url, [data], [fn], [type])jQuery.proxy(function, scope)jQuery.support jQuery.toArray()jQuery.trim(str)jQuery.unique(array)keydown()keydown(fn)keypress()keypress(fn)keyup()keyup(fn)last()length live(type, [data], fn)load(url, [data], [callback])map(callback)mousedown(fn)mousemove(fn)mouseout(fn)mouseover(fn)mouseup(fn)next([expr])nextAll([expr])nextUntil([expr])not(expr)offset(coordinates)offsetParent()offset one(type, [data], fn)outerHeight(options)outerWidth(options)parent > child parent([expr])parents([expr])parentsUntil([expr])position()prepend(content)prepend(function(index, html))prependTo(content)prev + next prev ~ siblings prev([expr])prevAll([expr])prevUntil([expr])queue(name ,callback)queue(name)queue(name, queue)ready(fn)remove([expr])removeAttr(name)removeClass(class | fn])removeClass(class)removeData(name)replaceAll(selector)replaceWith(content)resize(fn)scroll(fn)scrollLeft()scrollLeft(val)scrollTop()scrollTop(val)select()select(fn)selector1,selector2,selectorN selector serialize()serializeArray()show()show(speed, [callback])siblings([expr])size()slice(start, [end])slideDown(speed, [callback])slideToggle(speed, [callback])slideUp(speed, [callback])stop([clearQueue], [gotoEnd])submit()submit(fn)text()text(function(index, text))text(val)toggle()toggle(fn, fn2, [fn3, fn4, ...])toggle(speed, [callback])toggle(switch)toggleClass(class)toggleClass(class, switch)toggleClass(function(index, class), [switch])trigger(type, [data])triggerHandler(type, [data])unbind([type], [data])unload(fn)unwrap()val()val(array)val(function(index, value))val(val)width()width(val)wrap(elem)wrap(fn)wrap(html)wrapAll(elem)wrapAll(html)wrapInner(elem)wrapInner(fn)wrapInner(html)

#id *.class :animated :button :checkbox :checked :contains :disabled :empty :enabled :eq :even :file :first-child :first :gt :has :header :hidden :hidden :image :input :last-child :last :lt :not :nth-child :odd :only-child :parent :password :radio :reset :selected :submit :text :visible [attrSel1][attrSel2][attrSelN][attribute!=value][attribute$=value][attribute*=value][attribute=value][attribute]add(expr, [context])addClass(class)addClass(function(index, class))after(content)after(function)ajaxComplete(callback)ajaxError(callback)ajaxSend(callback)ajaxStart(callback)ajaxStop(callback)ajaxSuccess(callback)ancestor descendant andSelf()animate(param,[dur],[e],[fn])animate(params, options)append(content)append(function(index, html))appendTo(content)attr(key, fn)attr(key, value)attr(name)attr(properties)before(content)before(function)bind(type, [data], fn)blur()blur(fn)change()change(fn)children([expr])clearQueue([queueName])click()click(fn)clone()clone(true)closest([expr])contents()context css(name)css(name, function(index, value))css(name, value)css(properties)data([name])data(name, value)data(obj)dblclick()dblclick(fn)delay(duration, [queueName])dequeue(name)detach([expr])die([type], [fn])each(callback)element empty()end()eq(index)error()error(fn)fadeIn(speed, [callback])fadeOut(speed, [callback])fadeTo(speed, opacity, [fn])filter(expr)filter(fn)find(expr)first()focus()focus(fn)focusin( [fn] )focusout( [fn] )get()get(index)has(expr)hasClass(class)height()height(val)hide()hide(speed, [callback])hover(over, out)html()html(function(index, html))html(val)index(subject)innerHeight()innerWidth()insertAfter(content)insertBefore(content)is(expr)jQuery()jQuery(callback)jQuery(elements)jQuery(expr, [context])jQuery(html, [ownerDoc])jQuery(html, props)jQuery.ajax([options])jQuery.ajaxSetup([options])jQuery.boxModel jQuery.browser.version jQuery.browser jQuery.contains(container, contained)jQuery.data([element], [key])jQuery.data(element, key, val)jQuery.each(object, [callback])jQuery.error(message)jQuery.extend([d],tgt,obj1,[objN])jQuery.extend(object)jQuery.fn.extend(object)jQuery.fx.off jQuery.get(url, [data], [fn], [type])jQuery.getJSON(url, [data], [fn])jQuery.getScript(url, [callback])jQuery.grep(array, fn, [invert])jQuery.inArray(value, array)jQuery.isArray(obj)jQuery.isEmptyObject(obj)jQuery.isFunction(obj)jQuery.isPlainObject(obj)jQuery.makeArray(obj)jQuery.map(array, callback)jQuery.merge(first, second)jQuery.noConflict()jQuery.noConflict(extreme)jQuery.noop jQuery.param(obj, [traditional])jQuery.parseJSON(json)jQuery.post(url, [data], [fn], [type])jQuery.proxy(function, scope)jQuery.support jQuery.toArray()jQuery.trim(str)jQuery.unique(array)keydown()keydown(fn)keypress()keypress(fn)keyup()keyup(fn)last()length live(type, [data], fn)load(url, [data], [callback])map(callback)mousedown(fn)mousemove(fn)mouseout(fn)mouseover(fn)mouseup(fn)next([expr])nextAll([expr])nextUntil([expr])not(expr)offset(coordinates)offsetParent()offset one(type, [data], fn)outerHeight(options)outerWidth(options)parent > child parent([expr])parents([expr])parentsUntil([expr])position()prepend(content)prepend(function(index, html))prependTo(content)prev + next prev ~ siblings prev([expr])prevAll([expr])prevUntil([expr])queue(name ,callback)queue(name)queue(name, queue)ready(fn)remove([expr])removeAttr(name)removeClass(class | fn])removeClass(class)removeData(name)replaceAll(selector)replaceWith(content)resize(fn)scroll(fn)scrollLeft()scrollLeft(val)scrollTop()scrollTop(val)select()select(fn)selector1,selector2,selectorN selector serialize()serializeArray()show()show(speed, [callback])siblings([expr])size()slice(start, [end])slideDown(speed, [callback])slideToggle(speed, [callback])slideUp(speed, [callback])stop([clearQueue], [gotoEnd])submit()submit(fn)text()text(function(index, text))text(val)toggle()toggle(fn, fn2, [fn3, fn4, ...])toggle(speed, [callback])toggle(switch)toggleClass(class)toggleClass(class, switch)toggleClass(function(index, class), [switch])trigger(type, [data])triggerHandler(type, [data])unbind([type], [data])unload(fn)unwrap()val()val(array)val(function(index, value))val(val)width()width(val)wrap(elem)wrap(fn)wrap(html)wrapAll(elem)wrapAll(html)wrapInner(elem)wrapInner(fn)wrapInner(html)