Jquery高亮显示文本中重要的关键字

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    <ul class="entity-results">

        <li><a class="d1" href="#">Summary</a></li>

        <li><a class="d2" href="#">Avatar</a></li>

        <li><a class="d3" href="#">Formats</a></li>

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        <h2>

            Avatar (2009 film)</h2>

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            <img src="images/avatar.jpg" alt="Avatar poster" />

            <p>

                Avatar, also known as James Cameron's Avatar, is an American 3-D science fiction

                epic film written and directed by <ahref="http://en.wikipedia.org/wiki/James_Cameron">

                    James Cameron</a>, and was released on December 16, 2009 by 20th Century Fox.

                The film is co-produced by <ahref="http://en.wikipedia.org/wiki/Lightstorm_Entertainment">

                    Lightstorm Entertainment</a>, and <span class="d1">focuses on an epic conflict on Pandora</span>,

                an inhabited Earth-sized moon of Polyphemus, one of three fictional gas giants orbiting

                <a href="http://en.wikipedia.org/wiki/Alpha_Centauri_A">Alpha Centauri A</a>. On

                Pandora, human colonists and the sentient humanoid indigenous inhabitants of Pandora,

                the Na'vi, engage in a war over the planet's resources and the latter's continued

                existence. The film's title refers to <span class="d2">an avatar, a representation of

                    a real person in a virtual world</span>.</p>

            <p>

                <span class="d3">The film was released in 2D and 3D formats</span>, along with an

                IMAX 3D release in selected theaters. The film is being touted as a breakthrough

                in terms of filmmaking technology, for its development of 3D viewing and stereoscopic

                filmmaking with cameras that were specially designed for the film's production.</p>

            <p>

                Read the rest of the <ahref="http://en.wikipedia.org/wiki/Avatar_(2009_film)">original

                    Wikipedia page about Avatar</a></p>

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    // mask source 控制mask的动画效果

    var maskSource = jQuery('.mask');

    jQuery('.entity-results').hover(function() {

        maskSource.animate({opacity:0.7},1).fadeIn('750');

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        maskSource.fadeOut('1000');

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    // match hover 控制段落的高亮显示

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    var sample2 = jQuery('span.d2');

    var sample3 = jQuery('span.d3');

    jQuery('a.d1').hover(function() {

        sample1.addClass('show');   //给段落添加类

    }, function() {

        sample1.removeClass('show'); //移除段落类

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    jQuery('a.d2').hover(function() {

        sample2.addClass('show');

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    jQuery('a.d3').hover(function() {

        sample3.addClass('show');

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