If you can remember the data type of JS in one sentence, then You're a real u so NB ！
U. I like to use it instead of you you 。
So, that means So, so, very, very, very …
NB, I don't need to talk about it, of course Cattle batch Ah!!!
>What starts with u is undefined
>There are string And ES6 NEW symbol
>Objects that start with o object
>There are two that start with n, number and null
>The ones that start with B can be thought of boolean
No, no, no, no one really can't remember it?