针对于动态append 多选框无法使用的问题

[FashionVon]

`
var active = {
addInput: function () {

            var index = jq('#enumDiv select').length;
            var newInput = ' <div class="layui-inline">\n' +
                '                <label class="layui-form-label"></label>\n' +
                '                <div class="layui-input-inline" style="width: 10%;">\n' +
                '                    <input type="text" name="enumName" placeholder="名称" autocomplete="off" class="layui-input">\n' +
                '                </div>\n' +
                '                <div class="layui-input-inline" style="width: 15%;">\n' +
                '                    <input type="text" name="enumValue" placeholder="枚举值" autocomplete="off" class="layui-input">\n' +
                '                </div>\n' +
                '                <div class="layui-input-inline" style="width: 40%;">\n' +
                '                    <select name="enumCity" xm-select="selectEnumCity' + index + '"id="selectEnumCity' + index + '" xm-select-show-count="3"\n' +
                '                          xm-select-search="" xm-select-search-type="dl">\n' +
                '                    </select>\n' +
                '                </div>\n' +
                '                <div class="layui-input-inline" style="width: 10%">\n' +
                '                    <input type="text" name="enumSort"  placeholder="排序" autocomplete="off" class="layui-input">\n' +
                '                </div>\n' +
                '                <div class="layui-input-inline" style="width: 5%">\n' +
                '                    <input type="button" value="删除" data-method="delInput" class="layui-btn layui-btn-danger">\n' +
                '                </div>\n' +
                '            </div>';

            jq('#enumDiv').append(newInput);
            //formSelects.init(newInput)
            formSelects.render();
            //formSelects.config('selectEnumCity' + index, {}, false);
            //formSelects.btns('selectEnumCity' + index, ['remove']);
            //formSelects.value('selectEnumCity' + index,[1]);
            //formSelects.render('selectEnumCity' + index);

        },
        delInput: function (othis) {
            othis.parents('.layui-inline').remove();
        }
    };
    //动态增加、删除枚举框
    jq('#enumDiv').on('click', '.layui-btn', function () {
        var othis = jq(this), method = othis.data('method');
        active[method].call(this, othis);
    });`

当我进行button动态增加多选框的，时候formSelect事件都失效了，请问该如何解决呢？