var keyword explanation

1,var can only define local variables, but cannot define member variables

2, the definition must be initialized at the same time, but not using VAR to define the variable is NULL

3,var is not a new type in itself, it is used to modify a local variable that can infer a specific type.

Comparison of Var and object

The object type defines the type of the specific value that can be changed again, and Var is the first assignment that determines the type of the variable.

var keyword explanation