Destroy the component instance

Note: When the echarts component needs to re-acquire data every time it is opened, the component instance will be destroyed when it is closed, so as to obtain the latest data next time 

In Vue, you can use  beforeDestroy the hook function in the component to perform some operations before the component is destroyed, such as clearing the timer, unsubscribing, etc. If you need to destroy the component instance when the component is closed, you can  beforeDestroy call  this.$destroy() the method in the hook function to destroy the component instance. In this way, when the component is closed, the component instance will also be destroyed to release the memory space.

In addition, if you need to destroy the child component of the component when the component is closed, you can   destroy the child component instance beforeDestroy by recursively calling the method of the child component in the hook function  of the parent component.$destroy