{{ block title }}
    研究说明
{{ endblock }}
{{ block content }}

<style>
    .tab {
        display: none;
    }
</style>

<div class="tab">

    <p>研究说明第一页</p>
    <br>
    <p>
        <button type="button" class="btn btn-primary btn-tab" data-offset="1">下一页</button>
    </p>
</div>

<div class="tab">
    <p>研究说明第二页</p>
    <br>
    <p>
        <button type="button" class="btn btn-primary btn-tab" data-offset="-1">上一页</button>
        <button class="btn btn-primary">结束阅读</button>
    </p>
</div>

<script>

    let activeTab = 0;

    function showCurrentTabOnly() {
        let tabIndex = 0;
        for (let tab of document.getElementsByClassName('tab')) {
            tab.style.display = tabIndex === activeTab ? 'block' : 'none';
            tabIndex++;
        }
    }

    showCurrentTabOnly();
    for (let btn of document.getElementsByClassName('btn-tab')) {
        btn.onclick = function () {
            activeTab += parseInt(btn.dataset.offset);
            showCurrentTabOnly();
        }
    }
</script>

{{ endblock }}