JS Lexical analysis

JS code at run time, first lexical analysis, and then run the execution code

Lexical Analysis

1, Mr. Cheng Acitive object, referred to as ao{};

2, the parameters are analyzed,

2.1 Convert the parameter value to the Ao property, and the value is undefined;

2.2 If the physical parameter is passed, the value of the AO attribute is replaced with the value of the formal parameter.

3, analysis of variables declared with Var

Ⅰ, if there is this attribute in the AO object, no processing is done.

Ⅱ, if not, the AO attribute is formed and the value is undefined.

4, analysis of declared functions

Ⅰ, if not, use the function as the AO attribute.

Ⅱ, if any, ruthlessly replaces the original attribute with the function as the AO attribute.

This article from "Chensir" blog, declined reprint!

JS Lexical analysis