fix: 修复折叠面板动画失效的问题

components/uni-collapse-item/uni-collapse-item.vue

 <template>
   <view class="uni-collapse-item">
     <view class="uni-collapse-item__title" @click="openCollapse(!is_open)">
-      <text class="uni-collapse-item__title-text"
-        :class="{'is-disabled':disabled,'open--active':is_open}">{{title}}</text>
+      <text class="uni-collapse-item__title-text" :class="{'is-disabled':disabled,'open--active':is_open}">{{title}}</text>
       <view class="down_arrow" :class="{'down_arrow--active': is_open}"></view>
     </view>
-    <view ref="boxRef" class="uni-collapse-item__content">
-      <view ref="contentRef" class="uni-collapse-item__content-box">
-        <slot></slot>
+    <view ref="boxRef" class="uni-collapse-item__content" :class="{'box-open--active':is_open}">
+      <view ref="contentRef" class="uni-collapse-item__content-box" :class="{'content-open--active':box_is_open}">
+       <slot></slot>
       </view>
     </view>
   </view>
@@ -36,6 +35,7 @@
       return {
         height: 0,
         is_open: this.open as boolean,
+        box_is_open: this.open as boolean,
         boxNode: null as UniElement | null,
         contentNode: null as UniElement | null,
       };
@@ -66,6 +66,12 @@
         this.openOrClose(open)
       },
       openOrClose(open : boolean) {
+        // #ifdef MP-WEIXIN
+        setTimeout(() => {
+          this.box_is_open = open
+        }, 10)
+        // #endif
+        // #ifndef MP-WEIXIN
         const boxNode = this.boxNode?.style!;
         const contentNode = this.contentNode?.style!;
         let hide = open ? 'flex' : 'none';
@@ -73,27 +79,30 @@
         let ani_transform = open ? 'translateY(0)' : 'translateY(-100%)';
         boxNode.setProperty('display', hide);
         this.$nextTick(() => {
-          contentNode.setProperty('transform', ani_transform);
-          contentNode.setProperty('opacity', opacity);
+          setTimeout(() => {
+            contentNode.setProperty('transform', ani_transform);
+            contentNode.setProperty('opacity', opacity);
+          }, 10)
         })
+        // #endif
       }
     }
   }
 </script>
 
-<style scoped>
+<style>
   .uni-collapse-item {
     background-color: #fff;
   }
 
-  .uni-collapse-item__title {
+  .uni-collapse-item .uni-collapse-item__title {
     flex-direction: row;
     align-items: center;
     padding: 12px;
     background-color: #fff;
   }
 
-  .down_arrow {
+  .uni-collapse-item .down_arrow {
     width: 8px;
     height: 8px;
     transform: rotate(45deg);
@@ -104,37 +113,48 @@
     transition-duration: 0.2s;
   }
 
-  .down_arrow--active {
+  .uni-collapse-item .down_arrow--active {
     transform: rotate(-135deg);
     margin-top: 0px;
   }
 
-  .uni-collapse-item__title-text {
+  .uni-collapse-item .uni-collapse-item__title-text {
     flex: 1;
     color: #000;
     font-size: 14px;
     font-weight: 400;
   }
 
-  .open--active {
+  .uni-collapse-item .open--active {
     /* background-color: #f0f0f0; */
     color: #bbb;
   }
 
-  .is-disabled {
+  .uni-collapse-item .is-disabled {
     color: #999;
   }
 
-  .uni-collapse-item__content {
+  .uni-collapse-item .uni-collapse-item__content {
     display: none;
     position: relative;
+    overflow: hidden;
   }
 
-  .uni-collapse-item__content-box {
+  .uni-collapse-item .box-open--active {
+    display: flex;
+  }
+
+  .uni-collapse-item .uni-collapse-item__content-box {
     width: 100%;
     transition-property: transform, opacity;
     transition-duration: 0.2s;
     transform: translateY(-100%);
     opacity: 0;
   }
+  /* #ifdef MP-WEIXIN */
+  .uni-collapse-item .content-open--active {
+    transform: translateY(0%);
+    opacity: 1;
+  }
+  /* #endif */
 </style>