JSFiddle - React, Tailwind, and code Playground

HTML

<article>
        <div class="items"></div>
        <a href="javascript:;" class="items-more-btn">展开</a>
    </article>


    <script type="text/template" id="item-tpl">
        <div class="item item__anim item__anim-{{index}}">
            <h2>标题{{index}}</h2>
            <p>{{content}}</p>
        </div>
    </script>

SCSS

body {
            background: #f2f2f2;
        }

        article {
            margin-bottom: 100px;
            width: 500px;
            text-align: center;
        }

        .items {
            width: 400px;
            margin: 30px auto;
        }

        .items-more-btn {
            margin-bottom: 20px;
        }

        @keyframes showBox {
            to {
                opacity: 1;
                transform: scale(1) translate3d(0, 0, 0);
            }
        }

        .item {
            position: relative;
            margin-top: 10px;
            width: 100%;
            height: 150px;
            background: #fff;
            border-radius: 10px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            color: #666;

            opacity: 0;
            transform: scale(.9) translate3d(0, -10px, 0);

            &:nth-child(odd) {
                height: 200px;
            }

            h2 {
                width: 100%;
                font-size: 18px;
            }

            &.item__anim {
                animation-name: showBox;
                animation-duration: .4s;
                animation-fill-mode: forwards;
            }

            &__anim-1 {
                animation-duration: .6s;
            }

            @mixin showingDelay() {
                @for $n from 1 through 30 {
                    &__anim-#{$n} {
                        animation-delay: #{(0.05 + $n / 10)}s;
                    }
                }
            }

            @include showingDelay();
        }

JavaScript

function addEvent(elem, type, handler) {
            elem.addEventListener(type, handler, false);
        }

        function qs(selector) {
            return document.querySelector(selector);
        }

        function qsa(selectors) {
            return document.querySelectorAll(selectors);
        }

        var mockData = ['内容1', '内容2', '内容3', '内容4', '内容5'];

        addEvent(qs('.items-more-btn'), 'click', function() {
            renderList(mockData);
        });

        var itemTpl = qs('#item-tpl').innerHTML;
        var itemsDOM = qs('.items');

        /**
         * 渲染数据
         * @param  {[type]} data [description]
         * @return {[type]}      [description]
         */
        function renderList(data) {
            var data = data.map(function(val, index) {
                return {
                    index: index + 1,
                    content: val
                };
            });

            var html = '';
            var fragment = document.createDocumentFragment();

            data.forEach(function(item) {
                var divTemp = document.createElement('div');

                // 模板替换
                divTemp.innerHTML = itemTpl.replace(/{{(\w+)}}/g, function(input, match) {
                    return match ? item[match] || '' : '';
                });

                fragment.appendChild(divTemp.firstElementChild);
            });

            // 渲染
            itemsDOM.appendChild(fragment);
        }