5 Rules of javascript--prototypes

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1, all reference types (objects, arrays, functions), all have object attributes, can be freely extended properties (except null)

var obj ==; var arr ==; function  = 100;

2. All reference types (objects, arrays, functions) have a __proto__ property, and the property value is a normal object. (__proto__ is called implicit prototype) (except for null)

Console.log (obj.__proto__); Console.log (arr.__proto__);
Console.log (fn.__proto__);

3, all functions, there is a prototype property, the property value is also a normal object. (prototype is called display prototype)

Console.log (Fn.prototype);

5 Rules of javascript--prototypes