JS first summary

html in <a> The four states of the tag :

link: State of initialization

visited: State of being accessed

active: Accessing status

hover： Mouse hover

Some easily forgotten concepts ：

 

 

  Function knowledge is not understood ：

                                                                        Scope

Pre parse

  Follow the video to understand better

Before js I don't quite understand , I reviewed this week js, New video 400 The set is too long , I can't finish reading , I saw it 142 Pre parse , Very detailed , Understand it more thoroughly than before .

I feel that my progress pace this week is slower than before , Speed up next week