BootStrap selectpicker后台动态绑定数据的方法

<select class="selectpicker" multiple> 
</select>

<script type="text/javascript">
 getOption();
 function getOption(){
 $.ajax({
 type:"get",
 url:"test.json",
 async:true,
 success:function (data) {
 var str = "";
 for(var i = 0;i<data.length;i++){
 str+='<option>'+data[i].value+'</option>'
 }
 $(".selectpicker").html(str);
 
 $(".selectpicker" ).selectpicker('refresh');
 }
 });
 }
</script>