✨(component): 完善 select 组件的清空操作

package/document-component/src/document/zh-CN/components/select.md

@@ -138,6 +138,45 @@ export default {
 </script>
 :::
 
+
+::: title 允许清空
+:::
+
+::: demo 通过 show-search 属性开启内容检索, input 变为可输入状态。在 multiple 模式下, 检索框位于 dropdown 顶部。
+
+<template>
+  <lay-space>
+    <lay-select v-model="value3" :allow-clear="true">
+    <lay-select-option value="1" label="学习"></lay-select-option>
+    <lay-select-option value="2" label="编码"></lay-select-option>
+    <lay-select-option value="3" label="运动"></lay-select-option>
+  </lay-select>
+    <lay-select v-model="value4" :allow-clear="true" :multiple="true">
+    <lay-select-option value="1" label="学习"></lay-select-option>
+    <lay-select-option value="2" label="编码"></lay-select-option>
+    <lay-select-option value="3" label="运动"></lay-select-option>
+  </lay-select>
+  </lay-space>
+</template>
+
+<script>
+import { ref } from 'vue'
+
+export default {
+  setup() {
+
+    const value3 = ref('1')
+    const value4 = ref(['1'])
+    return {
+      value3,
+      value4
+    }
+  }
+}
+</script>
+
+:::
+
 ::: title 海量数据 
 :::