jquery 取值赋值

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$("")是一个jquery对象，而不是一个dom element

value是dom element的属性

jquery与之对应的是val

val() :获得第一个匹配元素的当前值。

val(val):设置每一个匹配元素的值。

取值：val = $("#id")[0].value;

赋值：可以 $("#id")[0].value = "new value";
或者 $("#id").val("new value");

以下是jQuery 1.3.2文件

/* * jQuery JavaScript Library v1.3 * http://jquery.com/ * * Copyright (c) 2009 John Resig * Dual licensed under the MIT and GPL licenses. * http://docs.jquery.com/License * * Date: 2009-01-13 12:50:31 -0500 (Tue, 13 Jan 2009) * Revision: 6104 */(function(){var l=this,g,x=l.jQuery,o=l.$,n=l.jQuery=l.$=function(D,E){return new n.fn.init(D,E)},C=/^[^<]*(<(.|/s)+>)[^>]*$|^#([/w-]+)$/,f=/^.[^:#/[/.,]*$/;n.fn=n.prototype={init:function(D,G){D=D||document;if(D.nodeType){this[0]=D;this.length=1;this.context=D;return this}if(typeof D==="string"){var F=C.exec(D);if(F&&(F[1]||!G)){if(F[1]){D=n.clean([F[1]],G)}else{var H=document.getElementById(F[3]);if(H){if(H.id!=F[3]){return n().find(D)}var E=n(H);E.context=document;E.selector=D;return E}D=[]}}else{return n(G).find(D)}}else{if(n.isFunction(D)){return n(document).ready(D)}}if(D.selector&&D.context){this.selector=D.selector;this.context=D.context}return this.setArray(n.makeArray(D))},selector:"",jquery:"1.3",size:function(){return this.length},get:function(D){return D===g?n.makeArray(this):this[D]},pushStack:function(E,G,D){var F=n(E);F.prevObject=this;F.context=this.context;if(G==="find"){F.selector=this.selector+(this.selector?" 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F=e();if(G||F>=this.options.duration+this.startTime){this.now=this.end;this.pos=this.state=1;this.update();this.options.curAnim[this.prop]=true;var D=true;for(var E in this.options.curAnim){if(this.options.curAnim[E]!==true){D=false}}if(D){if(this.options.display!=null){this.elem.style.overflow=this.options.overflow;this.elem.style.display=this.options.display;if(n.css(this.elem,"display")=="none"){this.elem.style.display="block"}}if(this.options.hide){n(this.elem).hide()}if(this.options.hide||this.options.show){for(var H in this.options.curAnim){n.attr(this.elem.style,H,this.options.orig[H])}}}if(D){this.options.complete.call(this.elem)}return false}else{var I=F-this.startTime;this.state=I/this.options.duration;this.pos=n.easing[this.options.easing||(n.easing.swing?"swing":"linear")](this.state,I,0,1,this.options.duration);this.now=this.start+((this.end-this.start)*this.pos);this.update()}return 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I=this[0],F=I.offsetParent,E=I,N=I.ownerDocument,L,G=N.documentElement,J=N.body,K=N.defaultView,D=K.getComputedStyle(I,null),M=I.offsetTop,H=I.offsetLeft;while((I=I.parentNode)&&I!==J&&I!==G){L=K.getComputedStyle(I,null);M-=I.scrollTop,H-=I.scrollLeft;if(I===F){M+=I.offsetTop,H+=I.offsetLeft;if(n.offset.doesNotAddBorder&&!(n.offset.doesAddBorderForTableAndCells&&/^t(able|d|h)$/i.test(I.tagName))){M+=parseInt(L.borderTopWidth,10)||0,H+=parseInt(L.borderLeftWidth,10)||0}E=F,F=I.offsetParent}if(n.offset.subtractsBorderForOverflowNotVisible&&L.overflow!=="visible"){M+=parseInt(L.borderTopWidth,10)||0,H+=parseInt(L.borderLeftWidth,10)||0}D=L}if(D.position==="relative"||D.position==="static"){M+=J.offsetTop,H+=J.offsetLeft}if(D.position==="fixed"){M+=Math.max(G.scrollTop,J.scrollTop),H+=Math.max(G.scrollLeft,J.scrollLeft)}return{top:M,left:H}}}n.offset={initialize:function(){if(this.initialized){return}var K=document.body,E=document.createElement("div"),G,F,M,H,L,D,I=K.style.marginTop,J='<div style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"><div></div></div><table style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"cellpadding="0"cellspacing="0"><tr><td></td></tr></table>';L={position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"};for(D in L){E.style[D]=L[D]}E.innerHTML=J;K.insertBefore(E,K.firstChild);G=E.firstChild,F=G.firstChild,H=G.nextSibling.firstChild.firstChild;this.doesNotAddBorder=(F.offsetTop!==5);this.doesAddBorderForTableAndCells=(H.offsetTop===5);G.style.overflow="hidden",G.style.position="relative";this.subtractsBorderForOverflowNotVisible=(F.offsetTop===-5);K.style.marginTop="1px";this.doesNotIncludeMarginInBodyOffset=(K.offsetTop===0);K.style.marginTop=I;K.removeChild(E);this.initialized=true},bodyOffset:function(D){n.offset.initialized||n.offset.initialize();var F=D.offsetTop,E=D.offsetLeft;if(n.offset.doesNotIncludeMarginInBodyOffset){F+=parseInt(n.curCSS(D,"marginTop",true),10)||0,E+=parseInt(n.curCSS(D,"marginLeft",true),10)||0}return{top:F,left:E}}};n.fn.extend({position:function(){var H=0,G=0,E;if(this[0]){var F=this.offsetParent(),I=this.offset(),D=/^body|html$/i.test(F[0].tagName)?{top:0,left:0}:F.offset();I.top-=j(this,"marginTop");I.left-=j(this,"marginLeft");D.top+=j(F,"borderTopWidth");D.left+=j(F,"borderLeftWidth");E={top:I.top-D.top,left:I.left-D.left}}return E},offsetParent:function(){var D=this[0].offsetParent||document.body;while(D&&(!/^body|html$/i.test(D.tagName)&&n.css(D,"position")=="static")){D=D.offsetParent}return n(D)}});n.each(["Left","Top"],function(E,D){var F="scroll"+D;n.fn[F]=function(G){if(!this[0]){return null}return G!==g?this.each(function(){this==l||this==document?l.scrollTo(!E?G:n(l).scrollLeft(),E?G:n(l).scrollTop()):this[F]=G}):this[0]==l||this[0]==document?self[E?"pageYOffset":"pageXOffset"]||n.boxModel&&document.documentElement[F]||document.body[F]:this[0][F]}});n.each(["Height","Width"],function(G,E){var D=G?"Left":"Top",F=G?"Right":"Bottom";n.fn["inner"+E]=function(){return this[E.toLowerCase()]()+j(this,"padding"+D)+j(this,"padding"+F)};n.fn["outer"+E]=function(I){return this["inner"+E]()+j(this,"border"+D+"Width")+j(this,"border"+F+"Width")+(I?j(this,"margin"+D)+j(this,"margin"+F):0)};var H=E.toLowerCase();n.fn[H]=function(I){return this[0]==l?document.compatMode=="CSS1Compat"&&document.documentElement["client"+E]||document.body["client"+E]:this[0]==document?Math.max(document.documentElement["client"+E],document.body["scroll"+E],document.documentElement["scroll"+E],document.body["offset"+E],document.documentElement["offset"+E]):I===g?(this.length?n.css(this[0],H):null):this.css(H,typeof I==="string"?I:I+"px")}})})();

jquery 取值 赋值

jquery 取值赋值