length-jQuery1.8.0帮助文档

牛骨文教育服务平台(让学习变的简单)

牛骨文首页

: 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],[val; queue(element,[queueName]); dequeue([queueName]); clearQueue([queueName]); jQuery.noConflict([extreme]); 选择器; #id; element; .class; *; selector1,selector2,selectorN; ancestor descendant; parent > child; prev + next; prev ~ siblings; :first; :last; :not(selector); :even; :odd; :eq(index); :gt(index); :lt(index); :header; :animated; :focus; :contains(text); :empty; :has(selector); :parent; :hidden; :visible; [attribute]; [attribute=value]; [attribute!=value]; [attribute^=value]; [attribute$=value]; [attribute*=value]; [selector1][selector2][selecto; :nth-child; :first-child; :last-child; :only-child; :input; :text; :password; :radio; :checkbox; :submit; :image; :reset; :button; :file; :enabled; :disabled; :checked; :selected; 属性; attr(name|pro|key,val|fn); removeAttr(name); prop(name|pro|key,val|fn); removeProp(name); addClass(class|fn); removeClass([class|fn]); toggleClass(class|fn[,sw]); html([val|fn]); text([val|fn]); val([val|fn|arr]); 筛选; eq(index|-index); first(); last(); hasClass(class); filter(expr|obj|ele|fn); is(expr|obj|ele|fn); map(callback); has(expr|ele); not(expr|ele|fn); slice(start, [end]); children([expr]); 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(); contents(); end(); 文档处理; append(content|fn); appendTo(content); prepend(content|fn); prependTo(content); after(content|fn); before(content|fn); insertAfter(content); insertBefore(content); wrap(html|ele|fn); unwrap(); wrapAll(html|ele); wrapInner(html|ele|fn); replaceWith(content|fn); replaceAll(selector); empty(); remove([expr]); detach([expr]); clone([Even[,deepEven]]); CSS; css(name|pro|[,val|fn]); offset([coordinates]); position(); scrollTop([val]); scrollLeft([val]); height([val|fn]); width([val|fn]); innerHeight(); innerWidth(); outerHeight([options]); outerWidth([options]); 事件; ready(fn); on(events,[selector],[data],fn; off(events,[selector],[fn]); bind(type,[data],fn); one(type,[data],fn); trigger(type,[data]); triggerHandler(type,[data]); unbind(type,[data|fn]); live(type,[data],fn); die(type,[fn]); delegate(sel,[type],[data],fn); undelegate([sel,[type],fn]); hover([over,]out); toggle(fn, fn2, [fn3, fn4, ...; blur([[data],fn]); change([[data],fn]); click([[data],fn]); dblclick([[data],fn]); error([[data],fn]); focus([[data],fn]); focusout([data],fn); keydown([[data],fn]); keypress([[data],fn]); keyup([[data],fn]); mousedown([[data],fn]); mouseenter([[data],fn]); mouseleave([[data],fn]); mousemove([[data],fn]); mouseout([[data],fn]); mouseover([[data],fn]); mouseup([[data],fn]); resize([[data],fn]); scroll([[data],fn]); select([[data],fn]); submit([[data],fn]); unload([[data],fn]); 效果; show([speed,[easing],[fn]]); hide([speed,[easing],[fn]]); slideDown([speed],[easing],[fn; slideUp([speed,[easing],[fn]]); slideToggle([speed],[easing],[; fadeIn([speed],[easing],[fn]); fadeOut([speed],[easing],[fn]); fadeTo([[speed],opacity,[easin; fadeToggle([speed,[easing],[fn; animate(param,[spe],[e],[fn]); stop([cle],[jum]); delay(duration,[queueName]); jQuery.fx.off; jQuery.fx.interval; Ajax; jQuery.ajax(url,[settings]); load(url,[data],[callback]); jQuery.get(url,[data],[callbac; jQuery.getJSON(url,[data],[cal; jQuery.getScript(url,[callback; jQuery.post(url,[data],[callba; ajaxComplete(callback); ajaxError(callback); ajaxSend(callback); ajaxStart(callback); ajaxStop(callback); ajaxSuccess(callback); jQuery.ajaxSetup([options]); serialize(); serializeArray(); 工具; jQuery.support; jQuery.browser; jQuery.browser.version; jQuery.boxModel; jQuery.each(object,[callback]); jQuery.extend([deep],target,ob; jQuery.grep(array,callback,[in; jQuery.makeArray(obj); jQuery.map(array, callback); jQuery.inArray(val,arr,[from]); jQuery.toArray(); jQuery.sub(); jQuery.when(deferreds); jQuery.merge(first,second); jQuery.unique(array); jQuery.parseJSON(json); jQuery.noop; jQuery.proxy(function,context); jQuery.contains(container, con; jQuery.isArray(obj); jQuery.isFunction(obj); jQuery.isEmptyObject(obj); jQuery.isPlainObject(obj); jQuery.isWindow(obj); jQuery.isNumeric(value); jQuery.type(obj); jQuery.trim(str); jQuery.param(obj,[traditional]; jQuery.error(message); 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],[pr; 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][,; callbacks.has(callback); callbacks.lock(); callbacks.locked(); callbacks.remove(callbacks); jQuery.callbacks(flags); 关于; 关于jQuery API 文档; 提交bug及获取更新; 其它; HTML5速查表; 正则表达式速查表

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

jQuery 代码:

$("img").length;

结果:

copyright © 2008-2019 亿联网络版权所有备案号：粤ICP备14031511号-2