select多选

1.css
<style>
        .divBox{
            width:400px;
            margin:100px auto;
        }
        .divBox span{
            vertical-align:top;
            display:inline-block;
            margin-top:16px;
        }
        .divBox .duiMutiple{
            display:inline-block;
            width:330px;
            vertical-align:top;
        }

        .divSel{
            height:35px;
            line-height:35px;
            padding-left:10px;
            cursor:pointer;
            border-radius:5px;
            border:1px solid #A0A0A0;
            margin-top:10px;
            background:url('images/sel.png') no-repeat 310px center;
            background-size:10px;
        }
        select{
            margin-top:10px;
            width:330px;
            height:150px;
            border-radius:5px;
            border:1px solid #A0A0A0;
            display:none;
        }
    </style>

2.html
<div class="divBox">
        <span>水果</span>
        <div class="duiMutiple">
            <div class="divSel">可多选</div>
            <select id="usertype" name="usertype" class="selectpicker show-tick form-control" multiple data-live-search="false">
                <option value="0">苹果</option>
                <option value="1">菠萝</option>
                <option value="2">香蕉</option>
                <option value="3">火龙果</option>
                <option value="4">梨子</option>
                <option value="5">草莓</option>
                <option value="6">哈密瓜</option>
                <option value="7">椰子</option>
                <option value="8">猕猴桃</option>
                <option value="9">桃子</option>
            </select>
        </div>
    </div>

3.js
<script>
        //select多选
            $("#usertype").hide();
            $(".divSel").click(function() {
                $("#usertype").toggle();
            });

            $('#usertype').change(function(){
                var o=document.getElementById('usertype').getElementsByTagName('option');
                var all="";
                console.log(o[1]);
                for(var i=0;i<o.length;i++){
                    if(o[i].selected){
                        all+=o[i].text+" ";
                    }
                }
                $('.divSel').html(all);
            })
    </script>

4.效果图