Ch2x

Use vue.extend to create a new component, call the method in beforeDestroy, there is no response,it is working in 2.6

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### Version 2.7.8 ### Reproduction link [codepen.io/Ch2x/pen/VwXMbJm](https://codepen.io/Ch2x/pen/VwXMbJm) ### Steps to reproduce 1.Use Vue.extend to create a new component Notify. 2.call Notify() to show blue square in mounted method 3.call close()...