bootstrap的日期插件bootstrap-datatimepicker-master如何设置，只显示年份

<script type="text/javascript" src="./js/jquery-1.9.1.min.js"></script>
<link type="text/css" rel="stylesheet" href="./bootstrap/css/bootstrap.min.css">
<script type="text/javascript" src="./bootstrap/js/bootstrap.min.js"></script>

<link type="text/css" rel="stylesheet" href="./bootstrap-datetimepicker-master/css/bootstrap-datetimepicker.min.css">
<script type="text/javascript" src="./bootstrap-datetimepicker-master/js/bootstrap-datetimepicker.min.js"></script>
<script type="text/javascript" src="./bootstrap-datetimepicker-master/js/bootstrap-datetimepicker.zh-CN.js"></script>

首先要引入插件库

2.html部分

<div class="form-group">
    <label >查询时间</label>
    <input type="text" class="form-control form-filter yearpicker" readonly name="year" id="search_year" />
    <label >年</label>
</div>

3.js部分

<script type="text/javascript">
    $("#search_year").datetimepicker({
        format: 'yyyy',
        startView : "decade",
        minView: 'decade',
        language : 'zh-CN',
        autoclose: true
    }).on('changeDate',function(ev){
        var search_year=$("#search_year").val();
        $("#search_year").datetimepicker('hide');
    });

</script>