html代码

<div class="layui-form-item">
                    <div class="layui-inline">
                        <label class="layui-form-label">动物类别</label>
                        <div class="layui-input-inline">
                            <select name="animalType"  xm-select="animalType" lay-verify="required"
                                    xm-select-skin="default"
                                    xm-select-radio class="layui-input-block">
                                <option value="">请选择动物类别</option>
                            </select>
                        </div>
                    </div>
                    <div class="layui-inline">
                        <label class="layui-form-label">动物名称</label>
                        <div class="layui-input-inline">
                            <select name="animalName" xm-select="animalName" lay-verify="required" xm-select-skin="default"
                                    xm-select-radio
                                    xm-select-search="" xm-select-search-type="dl">
                                <option value="">请选择动物名称</option>
                            </select>
                        </div>
                    </div>
                </div>

js代码

formSelects.on('animalType', function(id, vals, val, isAdd, isDisabled){
    $.ajax({
        url:setter.BASE_SERVER + "demo/list",
        //data 查询条件，根据动物类型查询动物名称
        data:{
            "animalType":val.type,
            "status":"1"
        },
        success:function(data){
            var data = data.res_data;
            var selectData = [];
            //拼写数据结构
            for (var i = 0 ; i < data.length ; i ++){
                var eachData = {name:data[i].animalName,value:data[i].id}
                selectData.push(eachData);
                //selectData的数据结构
                //[
                //    {"name": "燕子", "value": 1},
                //    {"name": "麻雀", "value": 2},
                //    {"name": "老鹰", "value": 3},
                //    {"name": "白鹤", "value": 4},
                //]
            }

            //local模式
            formSelects.data('animalName', 'local', {
                arr: selectData
            });
        }
    });
});

PS:在网上找了好多layui的级联demo，每个是都不太符合我的需求，最后根据文档自己写了一个。