Vue responsive quiz

vue has been using it for some time and doesn"t quite understand his response. The vue response has one limitation, that is,

Vue does not allow new root-level responsive attributes (root-level reactive property)) to be dynamically added to instances that have already been created. However, it can use the Vue.set (object, key, value) method to add response properties to nested objects:

then I found that I still didn"t understand when I was working on the project.

the first case

how do you explain this?

Vue.js javascript

Mar.12,2021

replace the object as a whole (you need to update the page at this time, but you haven't started to update the page yet), and then add the root-level attribute (before you start updating the page, there is a hobby). On the user Start updating the page (hobby, on user renders hobby to the page together)

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