<div class="teacher-mean">
<div class="mean">
    <div class="mean-lists">
        <div class="mean-list"><a href="#">全部</a></div>
        <div class="mean-list"><a href="#">神經</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
        <div class="mean-list"><a href="#">腫瘤</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
        <div class="mean-list"><a href="#">全部</a></div>
        <div class="mean-list"><a href="#">神經</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
        <div class="mean-list"><a href="#">腫瘤</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
        <div class="mean-list"><a href="#">全部</a></div>
        <div class="mean-list"><a href="#">神經</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
        <div class="mean-list"><a href="#">腫瘤</a></div>
        <div class="mean-list"><a href="#">心血管</a></div>
    </div>
</div>
</div>

<div class="change">
    <button onclick="navHide();">收起<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>
    <button onclick="navShow();">展開<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>
</div>

<script src="common/plugin/jquery/jquery-2.1.4.min.js"></script>

<script type="text/javascript">
    function navHide(){
        $(".mean-lists:not('.mean-lists:first')").slideUp(1000);
        $(".change").html('<button  onclick="navShow();">展開<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>')
    }
    function navShow(){
        $(".mean-lists").slideDown(1000);
        $(".change").html('<button onclick="navHide();">收起<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>')
    }
</script>
<script type="text/javascript">
    function navHide(){
        $(".mean").animate({height:'2.3rem'});
        $(".change").html('<button  onclick="navShow();">展開<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>')
    }
    function navShow(){
        var num = $(".mean-list ").length;
        var h = 1.87 * num + 'rem';
        console.log(h)
        $(".mean").animate({height:'100%'});
        $(".change").html('<button onclick="navHide();">收起<span class="change-icon"><img src="private/img/hall/jt.png"/></span></button>')
    }
</script>