diff --git a/components/chapter3/RandomImage.vue b/components/chapter3/RandomImage.vue
index b6f4b23..63a93d0 100644
--- a/components/chapter3/RandomImage.vue
+++ b/components/chapter3/RandomImage.vue
@@ -1,68 +1,80 @@
 <template>
-	<image v-if="selectedItem" :src="selectedItem.image" class="random-image" mode="" />
-	<view v-if="selectedItem" class="random-image-name">
-		{{selectedItem.name}}
-	</view>
-	<view v-if="selectedItem" class="random-image-desc">
-		{{selectedItem.desc}}
-	</view>
-	<MusicControl />
+  <view>
+    <image v-if="selectedItem" :src="selectedItem.image" class="random-image" mode=""></image>
+    <view v-if="selectedItem" class="random-image-name">
+      {{selectedItem.name}}
+    </view>
+    <view v-if="selectedItem" class="random-image-desc">
+      {{selectedItem.desc}}
+    </view>
+    <MusicControl />
+  </view>
 </template>
 
-<script setup>
-	import {
-		ref,
-		onMounted
-	} from 'vue'
+<script>
+import MusicControl from './MusicControl.vue'
 
-	const props = defineProps({
-		images: {
-			type: Array,
-			required: true
-		}
-	})
-	const selectedItem = ref(null)
-
-	// 随机选择一项
-	const selectRandomImage = () => {
-		if (props.images && props.images.length > 0) {
-			const randomIndex = Math.floor(Math.random() * props.images.length)
-			selectedItem.value = props.images[randomIndex]
-		}
-	}
-	onMounted(() => {
-		selectRandomImage()
-	})
-	defineExpose({
-		selectRandomImage,
-		selectedItem
-	})
+export default {
+  components: {
+    MusicControl
+  },
+  props: {
+    images: {
+      type: Array,
+      required: true
+    }
+  },
+  data() {
+    return {
+      selectedItem: null
+    }
+  },
+  mounted() {
+    this.selectRandomImage()
+  },
+  methods: {
+    selectRandomImage() {
+      if (this.images && this.images.length > 0) {
+        const randomIndex = Math.floor(Math.random() * this.images.length)
+        this.selectedItem = this.images[randomIndex]
+      }
+    }
+  },
+  computed: {
+    exposedMethods() {
+      return {
+        selectRandomImage: this.selectRandomImage,
+        selectedItem: this.selectedItem
+      }
+    }
+  }
+}
 </script>
 
 <style scoped>
-	.random-image {
-		width: 100%;
-		height: 100%;
-	}
+.random-image {
+  width: 100%;
+  height: 100%;
+}
 
-	.random-image-name {
-		position: absolute;
-		bottom: 30%;
-		left: 50%;
-		transform: translate(-50%, -50%);
-		color: #ffffff;
-		font-size: 52rpx;
-	}
+.random-image-name {
+  position: absolute;
+  bottom: 30%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  color: #ffffff;
+  font-size: 52rpx;
+}
 
-	.random-image-desc {
-		white-space: nowrap;
-		position: absolute;
-		bottom: 25%;
-		left: 50%;
-		transform: translate(-50%, -50%);
-		color: #ffffff;
-		font-size: 24rpx;
-		font-weight: 300;
-		opacity: .8;
-	}
+.random-image-desc {
+  white-space: nowrap;
+  position: absolute;
+  bottom: 25%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  color: #ffffff;
+  font-size: 24rpx;
+  font-weight: 300;
+  opacity: .8;
+}
 </style>
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