I have to do some async call in some constructor, like retrieve data from 
mysql. 
I'm trying to use Promise to handle the 'async' thing but I find it 
impossible because:

I must return Promise object in constructor but the constructor is called 
by 'new' key word, there shouldn't be any 'return' in constructor.

Is there some way to do this piece of work?
Now I just add another function like 'init' to do the async part, can I do 
it in constructor ?

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