//添加类addClass: function( value ) {var classNames, i, l, elem,setClass, c, cl;//如果value是一个函数，则调用这个函数得到运算结果，然后再递归调用addClassif ( jQuery.isFunction( value ) ) {return this.each(function( j ) {jQuery( this ).addClass( value.call(this, j, this.className) );});}if ( value && typeof value === "string" ) {//得到传入的class数组classNames = value.split( core_rspace );//this表示调用此方法的jQuery对象，可能有多个for ( i = 0, l = this.length; i < l; i++ ) {elem = this[ i ];//元素类型节点类型:元素element 1;属性attr 2;文本text 3;注释comments 8;文档document 9        //如果是元素节点        if ( elem.nodeType === 1 ) {//如果元素没有class并且classNames数组只有一个元素，则直接赋值if ( !elem.className && classNames.length === 1 ) {elem.className = value;} else {setClass = " " + elem.className + " ";//循环添加要加入的classfor ( c = 0, cl = classNames.length; c < cl; c++ ) {if ( setClass.indexOf( " " + classNames[ c ] + " " ) < 0 ) {setClass += classNames[ c ] + " ";}}elem.className = jQuery.trim( setClass );}}}}//返回获取的jQuery对象return this;},

//删除指定的类removeClass: function( value ) {var removes, className, elem, c, cl, i, l;if ( jQuery.isFunction( value ) ) {return this.each(function( j ) {jQuery( this ).removeClass( value.call(this, j, this.className) );});}if ( (value && typeof value === "string") || value === undefined ) {removes = ( value || "" ).split( core_rspace );for ( i = 0, l = this.length; i < l; i++ ) {elem = this[ i ];if ( elem.nodeType === 1 && elem.className ) {//获取当前元素的class（用空格替换制表符或回车符、换行符）className = (" " + elem.className + " ").replace( rclass, " " );// loop over each item in the removal listfor ( c = 0, cl = removes.length; c < cl; c++ ) {// Remove until there is nothing to remove,while ( className.indexOf(" " + removes[ c ] + " ") >= 0 ) {className = className.replace( " " + removes[ c ] + " " , " " );}}//如果value为空，则直接去掉元素的所有class；否则使用处理后的classNameelem.className = value ? jQuery.trim( className ) : "";}}}//大部分方法都是返回this，遍于进行链式操作return this;},

//如果没有class则添加，如果有则删除//如果stateVal设置为true，则添加样式；如果为false，则删除样式toggleClass: function( value, stateVal ) {var type = typeof value,//判断stateVal是否为boolean类型isBool = typeof stateVal === "boolean";//value为function时递归调用if ( jQuery.isFunction( value ) ) {return this.each(function( i ) {jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );});}return this.each(function() {if ( type === "string" ) {// toggle individual class namesvar className,i = 0,self = jQuery( this ),state = stateVal,classNames = value.split( core_rspace );//如果className[ i++ ] 存在while ( (className = classNames[ i++ ]) ) {// check each className given, space separated list//如果第二个参数是boolean类型，则将第二个参数赋值给state；//否则判断当前jQuery对象是否拥有className这个类，将判断结果取反，赋值给statestate = isBool ? state : !self.hasClass( className );//如果state为true，则将className赋值给self['addClass'];//如果state为false，则将className赋值为self['removeClass'],这里的self就是当前jQuery对象self[ state ? "addClass" : "removeClass" ]( className );}} else if ( type === "undefined" || type === "boolean" ) {if ( this.className ) {// store className if setjQuery._data( this, "__className__", this.className );}// toggle whole className//如果className为空或者value为false，则直接清空对象的class；//否则将保存的_className赋值给当前对象的classNamethis.className = this.className || value === false ? "" : jQuery._data( this, "__className__" ) || "";}});},

//判断某个对象（或一个对象集中的第一个对象）是否拥有某个classhasClass: function( selector ) {var className = " " + selector + " ",i = 0,l = this.length;for ( ; i < l; i++ ) {if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) >= 0 ) {return true;}}return false;},