Think of it like this: you still have model+controller at the server side (REST interface), the whole HTML+Javascript thing is the view layer. This view layer happens to be modeled using the MVC pattern, which is a pretty smart move if you are writing complex user interfaces.
For example, if you are mimicking a spreadsheet, it is very handy to have the presentation layer modeled in MVC instead of writing all the old-fashioned-jQuery-spaghetti-code way.
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Think of it like this: you still have model+controller at the server side (REST interface), the whole HTML+Javascript thing is the view layer. This view layer happens to be modeled using the MVC pattern, which is a pretty smart move if you are writing complex user interfaces.
For example, if you are mimicking a spreadsheet, it is very handy to have the presentation layer modeled in MVC instead of writing all the old-fashioned-jQuery-spaghetti-code way.