JS 拼接select

<script>   
       function send() {  
            var id = $("#cate").val();  
            $.ajax({  
                type: "post",  
                url: "__MODULE__/Trainnd",  
                data: {id: id},  
                success: function (data) {  
                    //清空第二个select，解决无法显示BUG  
                    $("#list").empty();  
                        $.each(data, function (i) {  
                            $("#list").append("<option value="" + data[i]["train_id"] +    "">" + data[i]["name"] + "</option>");  
                        });  
                },  
                dataType: "json"  
            });  
        }  
</script>