JS design mode---Reading notes 001--expressive JS

JS Weak type:

Raw data types are transferred by value, and other data types are routed by reference

Variables can vary type based on assigned value, type conversion between primitive types (toString (), parseint (), parsefloat (), double ' non ' transition to Boolean value )

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Function:

Anonymous functions are used to create closures (a protected variable space, generated by inline functions).

Function-level scope--function internal variables are not accessed externally

The word hair nature of a scope---function runs at the scope that defines it, not the scope that calls it

Object:

Variability----can modify objects

Introspection-----can examine the properties and methods of an object at run time, which can be used to dynamically instantiate a class and execute its methods (called reflection)

JS anything can be modified in the run.

Inheritance (two types of methods):

Object-based (prototype) inheritance

Imitating class-based inheritance

It's easy to implement design patterns, and knowing when to use what patterns is the key

　　　　

JS design mode---Reading notes 001--expressive JS