✨(component): 统一级别联动与下拉选择图标

package/component/src/component/cascader/index.less

@@ -37,12 +37,12 @@
 .layui-cascader .layui-input-suffix{
   padding-right: 10px;
 }
-.layui-cascader .layui-icon-down {
+.layui-cascader .layui-icon-triangle-d {
   transition: all 0.3s ease-in-out;
   transform: rotate(0);
   color:var(--global-neutral-color-8);
 }
-.layui-cascader-opend .layui-icon-down {
+.layui-cascader-opend .layui-icon-triangle-d {
   transform: rotate(180deg);
 }
 

package/component/src/component/cascader/index.vue

@@ -13,7 +13,7 @@
     <lay-input
       v-model="displayValue"
       readonly
-      suffix-icon="layui-icon-down"
+      suffix-icon="layui-icon-triangle-d"
       :placeholder="placeholder"
       v-if="!slots.default"
       :allow-clear="allowClear"

package/component/src/component/select/index.less

@@ -145,7 +145,7 @@ dl.layui-anim-upbit > dd .layui-form-checkbox,
   }
 }
 
-.layui-form-select .layui-icon-down {
+.layui-form-select .layui-icon-triangle-d {
   display: inline-block;
   transition: all 0.3s;
   -webkit-transition: all 0.3s;

package/component/src/component/select/index.vue

@@ -210,7 +210,7 @@ provide("keyword", txt);
       <span class="layui-input-icon-area">
         <i
           :class="[
-            'layui-icon layui-icon-down',
+            'layui-icon layui-icon-triangle-d',
             { 'layui-disabled': disabled },
           ]"
           :style="{ transform: `rotate(${openState ? 180 : 0}deg)` }"
@@ -270,7 +270,7 @@ provide("keyword", txt);
         </lay-input>
       </div>
       <template v-if="!multiple && showEmpty && !props.create">
-        <lay-select-option :value="null" :label="emptyMessage ?? placeholder" />
+        <lay-select-option value="-1" :label="emptyMessage ?? placeholder" />
       </template>
       <template v-if="props.create">
         <dd @click="emit('create', txt)">{{ txt }}</dd>