div+radio模拟select

            <div class="section1">
                <div class="container">
                    <div class="row">
                        <div class="col-xs-12 col-sm-6">
                        </div>
                        <div class="col-xs-12 col-sm-6">
                            <div class="sort">
                                <span>Ordenar por</span>
                                <div class="pullDown">
                                    <div class="select" id="year">2020</div>
                                    <span class="glyphicon glyphicon-triangle-bottom"></span>
                                    <div class="seleUl">
                                        <div class="seleLi">
                                            <input id="2020" type="radio" name="year" class="checksele" value="2020" checked /><label for="2020">2020</label>
                                        </div>
                                        <div class="seleLi">
                                            <input id="2019" type="radio" name="year" class="checksele" value="2019" /><label for="2019">2019</label>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

.section1 div.sort,
.section1 div.sort>div {
    display: flex;
    justify-content: flex-end;
}

.section1 div.sort .select {
    font-weight: 600;
    font-size: 14px;
    line-height: 17px;
    color: #000000;
}

.section1 div.sort span,
.section1 div.sort>div {
    line-height: 37px;
    margin-left: 10px;
}

.section1 div.sort span,
.section1 div.sort div.select {
    line-height: 37px;
    font-size: 14px;
    color: #222;
}

.section1 .pullDown {
    position: relative;
}.section1 div.sort div.seleUl {
    margin-left: 15px;
    z-index: 2;
    background-color: #fff;
    border: 1px solid #7F7F7F;
    width: 100px;
    text-align: center;
    opacity: 0;
    position: absolute;
    top: 32px;
    right: 0;
}

.section1 .pullDown:hover .seleUl {
    /*opacity: 1;*/
    animation: fadeSele 1s;
    animation-fill-mode: forwards;
}

@keyframes fadeSele{
    0% { opacity: 0; }
    25% { opacity: .3; }
    50% { opacity: .6; }
    75% { opacity: .9; }
    100% { opacity: 1; }
}

.section1 .seleUl .seleLi {
    border-bottom: 1px solid #979797;
}

.section1 .seleUl .seleLi label {
    font-weight: 500;
    cursor: pointer;
}

.section1 .seleUl .seleLi input[type="radio"] {
    display: none;
}

.section1 .seleUl .seleLi input[type="radio"]:checked~label {
    font-weight: 700;
}

        <script type="text/javascript">
            $(".seleLi input[type=‘radio‘]").click(function() {
                $("#year").text($(this).attr("value"));
            });
        </script>