Please detail your understanding of vue at the life cycle?

There are four main stages: After you create before / DOM rendering before / after update before / after the destruction before / after.

For the understanding of each cycle: 
before creating / rear: 
beforeCreated: vue examples also in this case the element is not mounted $el, the object data are data undefiend; ($ EL no, no data)
Created: vue data object instance data there, but $elno (no $ el, existing data)
before loading / after: 
beforeMount: $ EL and data instances are initialized vue, but still mounted in a virtual DOM node before the above, data.message has not been replaced 
mounted : vue example of the mount is completed, data.message successfully rendered. 
Before updating / rear 
when the data changes, it will trigger beforeUpdate and updated methods. 
Destruction before / after: 
After destiory, changes to the data are no longer trigger periodic function, examples illustrate this point vue been unbound and event listeners and dom, but in accordance with dom