layerui 弹窗里出现下拉框select

layer.open({
            title: '影响范围'
            , btn: ['确定']
            , content: '<div class="layui-form-item">' +
                '<label class="layui-form-label">影响范围</label>' +
                '<div class="layui-input-block">' +
                '<select name="range" id="range" lay-filter="range">' +
                '<option value="0">范围1</option>' +
                '<option value="1">范围2</option>' +
                '<option value="2">范围3</option>' +
                '</select>' +
                '</div>' +
                '</div>',
                yes: function (index,layero) {
                    alert($('#range').val());
                }})});