單擊此導(dǎo)航按鈕后，不會(huì)顯示“about-goal”中的內(nèi)容。我需要在單擊“關(guān)于我”按鈕時(shí)顯示“關(guān)于目標(biāo)”內(nèi)容，并且還需要在單擊“主頁(yè)”按鈕時(shí)在同一頁(yè)面上顯示主頁(yè)。請(qǐng)幫忙。PS：我是初學(xué)者，只是想創(chuàng)建我的第一個(gè)網(wǎng)站。非常感謝！    $(document).ready(function(){                $('a').click(function(){                    //alert("i am click");                    var selected = $(this);                    $('a').removeClass('active');                    $(selected).addClass('active');                });                var $(a) = $('.a'),                $b = $('.b'),                $c = $('.c'),                $d = $('.d'),                $home = $('.home'),                $aboutGoal = $('.aboutGoal');                $a.click(function(){                    $home.fadeIn();                    $aboutGoal.fadeOut();                });                $b.click(function(){                    $home.fadeOut();                    $aboutGoal.fadeIn();                });            }); <ul>  <li class="a"><a href="#">Home</a></li>  <li class="b"><a href="#">About Me</a></li>  <li class="c"><a href="#">My Gallery</a></li>  <li class="d"><a href="#">Contact Me</a></li></ul><div class="aboutGoal">  <div class="about-me">    <h2>MY NAME IS...</h2>    <p class="p1">My name is... , 23 yrs. Old. I’m an aspiring web developer who loves everything about the web. I've lived in lots of different places and have worked in lots of different jobs. I’m excited to bring my life experience to the process of building fantastic      looking websites.</p>    <p class="p2">I’ve been a Service Desk Engineer in IBM and am a life-long learner who's always interested in expanding my skills.</p>  </div>