JS: The essence of Language note 12--Dynamic language features (2)

In parentheses:

• Overrides that occur when a value is assigned:

(Object1 = function () {}). Prototype.value = 100;var obj1 = new Object1;console.log (obj1.value);  100

• Rewrite of the syntax declaration phase://Will error, the general engine does not recognize the identifier declared in an expression;

(function Object2 () {}). Prototype.value = 100;

Rewrite:

• Impact on the internal object system:
  • Override built-in constructor: The prototype property of any constructor is not affected by the built-in constructor, it is always created from a constructor in a system engine;
  • Rewriting the prototype of a built-in constructor: affects the internal object system;

JS: The essence of Language note 12--Dynamic language features (2)