I have not come into contact with the background before. Will it be very difficult to learn node directly, and there are few documents related to node? is it necessary to learn php, to understand some programming ideas in the background before learning nodejs?
increase the cost of learning is not cost-effective, there is time to learn other languages, it is enough to learn node, the efficiency is too low. As for information, make good use of search engines, you can find a lot. One of the reasons why node is popular is that it costs less to learn at the front end, and you don't have to relearn a language. Of course, if for interest or other reasons to say otherwise.
node is asynchronous io non-blocking, using a large number of event drivers, if you want to learn node, you can first learn js
not necessary, do interface interaction but it is necessary to learn sql.
as a middle tier, you don't even have to sql.
personal opinion
No, nodejs is also the grammar of javascript. You can try to build your own framework. Express,koa can be
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