Vue It's one of the most popular front-end frameworks .
M：Model, It's the data layer , Maybe it's our fixed dead data , It could also be data from the server . But more data from the server （ Data requested from the network ）.
V：View, Is the view layer , It's usually in our front-end development DOM layer , The main function is to show users all kinds of information .
VM：ViewModel, It's the view model layer , It has two functions , One is data binding , take model Changes in real time are reflected in view in , On the other hand ：DOM monitor , When DOM When something happens, you can listen to , And change the corresponding if necessary data.