🐛(component): cascader组件 外部清空modelValue内部displayValue不清空问题

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

@@ -111,6 +111,14 @@ watch(
     initTreeData();
   }
 );
+watch(
+  ()=>props.modelValue,
+  ()=>{
+    if(props.modelValue===null||props.modelValue===''){
+      onClear();
+    }
+  }
+);
 
 const treeData = ref<any>([]);
 const initTreeData = () => {
@@ -266,6 +274,7 @@ const dropDownDisabled = ref(false);
 
 //清除事件
 const onClear = () => {
+  displayValue.value='';
   dropDownDisabled.value = true;
   let arr = JSON.parse(JSON.stringify(treeData.value));
   for (let index = 0; index < arr.length; index++) {

package/document-component/src/document/zh-CN/guide/changelog.md

@@ -11,6 +11,15 @@
 <template>
 <lay-timeline>
   <lay-timeline-item title="1.4.x">
+    <ul> 
+      <a name="1-4-14"></a> 
+      <li> 
+        <h3>1.4.15 <span class="layui-badge-rim">2022-09-27</span></h3> 
+        <ul>     
+          <li>[修复] cascader 外部清空modelValue, 内部displayValue不清空问题。</li>
+        </ul>
+      </li>
+    </ul>
     <ul> 
       <a name="1-4-14"></a> 
       <li>