prop: function( elem, name, value ) {

        var ret, hooks, notxml,

            nType = elem.nodeType;

        // don't get/set properties on text, comment and attribute nodes

        //标签不存在或者是文本、属性、注释节点

        if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {

            return;

        }

        notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

        if ( notxml ) {

            // 属性中的for与class涉及到保留字，所以通过propFix分别对应到htmlFor和className

            // propFix: {

            //     "for": "htmlFor",

            //     "class": "className"

            // }

            name = jQuery.propFix[ name ] || name;

            // propHooks: {

            //     tabIndex: {

            //         get: function( elem ) {

            //             return elem.hasAttribute( "tabindex" ) || rfocusable.test( elem.nodeName ) || elem.href ?

            //                 elem.tabIndex :

            //                 -1;

            //         }

            //     }

            // }

            //hasAttribute IE9+

            //rfocusable 用于检测可以处于焦点的表单元素正则

            hooks = jQuery.propHooks[ name ];

        }

        if ( value !== undefined ) {//赋值

            return hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ?

                ret :

                ( elem[ name ] = value );

        } else {//取值

            return hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ?

                ret :

                elem[ name ];

        }

    }

    removeProp: function( name ) {

        return this.each(function() {

            delete this[ jQuery.propFix[ name ] || name ];

        });

    }