單擊此導航按鈕后，不會顯示“about-goal”中的內容。我需要在單擊“關于我”按鈕時顯示“關于目標”內容，并且還需要在單擊“主頁”按鈕時在同一頁面上顯示主頁。請幫忙。PS：我是初學者，只是想創建我的第一個網站。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>