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HTML 

              
                <div id="menu">
    <!--   第一組清單   -->
    <div class="item">
        <div class="main">今日總覽</div>
        <div class="sub">
            <ul>
                <li>今日最新</li>
                <li>熱門排行</li>
                <li>特別企劃</li>
            </ul>
        </div>
    </div>
    <!--   第二組清單   -->
    <div class="item">
        <div class="main">成功者故事</div>
        <div class="sub"></div>
    </div>
    <!--   第三組清單   -->
    <div class="item">
        <div class="main">財經</div>
        <div class="sub">
            <ul>
                <li>產業動態</li>
                <li>趨勢報導</li>
                <li>地產風雲</li>
                <li>投資焦點</li>
                <li>個人理財</li>
            </ul>
        </div>
    </div>
    <!--   第四組清單   -->
    <div class="item">
        <div class="main">時事</div>
        <div class="sub">
            <ul>
                <li>國際</li>
                <li>兩岸</li>
                <li>新聞</li>
            </ul>
        </div>
    </div>
    <!--   第五組清單   -->
    <div class="item">
        <div class="main">職場力</div>
        <div class="sub">
            <ul>
                <li>經營創業</li>
                <li>管理新法</li>
                <li>職場修練</li>
                <li>心靈成長</li>
            </ul>
        </div>
    </div>
</div>
!

CSS 

              
                *{
    margin: 0;
    padding: 0;
}
#menu{
/*     width: 300px; */
    margin: 0 auto;
}
.item{
    float: left;
}
.main{
    background-color: #e33535;
    color: #FFF;
    font-family: "微軟正黑體";
    font-weight: bold;
    font-size: 20px;
    cursor: pointer;
    text-align: center;
    height: 35px;
    line-height: 35px;
    width: 100px;
}
.main:hover{
    background-color: #aaa;
}
.sub{
    background-color: #4d4949;
    color: #FFF;
    font-family: "微軟正黑體";
    text-align: center;
    font-weight: bold;
    width: 100px;
}
.sub li{
    height: 30px;
    line-height: 30px;
    border-bottom: 1px solid #777;
}
!

JS 

              
                $(document).ready(function() {
    var oldtext = ['今日總覽', '成功者故事', '財經', '時事', '職場力'];
    var newtext = ['Today', 'Success', 'Business', 'News', 'Career']

    //  讓 #menu 的寬度自動根據 main 的數量而變
    $("#menu").css("width", $(".main").length * 100)
        //  一進入畫面時收合選單
    $(".sub").slideUp(0);

    for (i = 0; i < $(".main").length; i++) {
        //  點選按扭時收合或展開選單
        $(".main:eq(" + i + ")").on("mouseover", {
            id: i
        }, function(e) {
            n = e.data.id
            $(".sub:eq(" + n + ")").slideToggle()
            $(".sub:not(:eq(" + n + "))").slideUp()
            $(".main:eq(" + n + ")").text(newtext[n])
        })
        $(".main:eq(" + i + ")").on("mouseleave", {
            id: i
        }, function(e) {
            n = e.data.id
            $(".main:eq(" + n + ")").text(oldtext[n])
            $(".sub").stop();
        })
    }
})
!
999px

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