Merge branch 'lhd'

src/views/book/courseware/create/components/question/video_interaction/ExerciseAdd.vue

@@ -2,7 +2,7 @@
   <div class="Exercise-add">
     <div class="type-box">
       <span>题型</span
-      ><el-select v-model="typeValue" size="small">
+      ><el-select v-model="typeValue" size="small" @change="handleChnageType">
         <el-option v-for="item in typeList" :key="item.value" :label="item.label" :value="item.value" />
       </el-select>
     </div>
@@ -125,6 +125,9 @@ export default {
     handleCancle() {
       this.$emit('handleCancle');
     },
+    handleChnageType() {
+      this.content = null;
+    },
   },
 };
 </script>