The relationship between JS Prototype and prototype chain

The prototype attribute in JS is a property that only the JS function has.
__proto__ is an object's built-in property, which means that objects other than null contain __proto__ properties

JS declares the function itself with the prototype property through the pointer to an instantiated prototype of the function such as a Declaration function demo () {}

in var test = new Demo (); After test has the __proto__ property, test also points to the test Demo.propotype prototype through the __proto__ property

The demo function points to the instantiated prototype through the prototype property, which is Demo.propotype

The relationship between JS Prototype and prototype chain