docs: event demo (#7699) (#7728)

Author: 5918vo

components/slider/demo/event.vue

@@ -17,15 +17,19 @@ The `onChange` callback function will fire when the user changes the slider's va
 
 <template>
   <div class="code-box-demo">
-    <a-slider v-model:value="value1" @afterChange="onAfterChange" />
-    <a-slider v-model:value="value2" range :step="10" @afterChange="onAfterChange" />
+    <a-slider v-model:value="value1" @change="onChange" @afterChange="onAfterChange" />
+    <a-slider v-model:value="value2" range :step="10" @change="onChange" @afterChange="onAfterChange" />
   </div>
 </template>
 <script lang="ts" setup>
 import { ref } from 'vue';
 const value1 = ref<number>(30);
 const value2 = ref<[number, number]>([20, 50]);
 
+const onChange = (value: number) => {
+  console.log('onChange: ', value);
+};
+
 const onAfterChange = (value: number) => {
   console.log('afterChange: ', value);
 };