1、blockly编程课列表靠左显示

src/views/programming/ProgrammingCourset.vue

@@ -49,6 +49,7 @@
             v-for="(item) in courseItems" 
             :key="item.id"
             class="slide-item"
+            :style="courseItems.length <= 3 ? { float: 'left' } : {}"
             @click="handleCourseItemClick(item)"
           >
             <div class="box-content">
@@ -464,7 +465,7 @@ const goBackIndex = () => {
   position: relative;
   flex: 1;
   cursor: grab; /* 显示可抓取图标 */
-  z-index: 2; 
+  z-index: 2;
   padding: 0 rpx(30);
   /* 设置背景图  */
   background-image: url('@/assets/programming/track01.png');