Error in nextTick TypeError Cannot read property 'children' of undefined 解决

Error in nextTick: “TypeError: Cannot read property ‘children’ of undefined” 解决

报错 Error in nextTick: “TypeError: Cannot read property ‘children’ of undefined”

解决：加一个判断 if (数据存在)，再执行this.nextTick()方法

if (this.$refs.child1) {this.$nextTick(() => {this.$refs.child1.updateOpened();});}