判断变量是否存在

Author: jack

src/components/MyRating.vue

@@ -2,7 +2,7 @@
  * @Description :
  * @Date : 2022-01-16 22:01:25 +0800
  * @Author : JackChou
- * @LastEditTime: 2022-01-16 23:59:10 +0800
+ * @LastEditTime: 2022-01-20 00:09:36 +0800
  * @LastEditors : JackChou
 -->
 <template>
@@ -63,7 +63,7 @@ export default {
  // myRatingComponent.value = 4;
  myRatingComponent.setAttribute('value', 4)
  console.log('set value')
- myRatingComponent.getValue({ maxValue: 10, value: 5 }).then(value => {
+ myRatingComponent && myRatingComponent.getValue({ maxValue: 10, value: 5 }).then(value => {
  console.log('get value', value)
  })
  console.log(this.$refs.myRating)