JS 继承 #js #prototype

inherit.js

function object(o) {
	const F = function() {};
	F.prototype = o;
	return new F();
}

function extend(Child, Parent) {
	var prototype = object(Parent.prototype);
	prototype.constructor = Child;
  	Child.prototype = prototype;
}

function extend(Parent, Child) {
  	Child.prototype.__proto__ = Parent.prototype;
}

function extend(Child, Parent) {
	let prototypeObj = Object.create(Parent.prototype);
  	prototypeObj.constructor = Child;
  	Child.prototype = prototypeObj;
}