js通过代码来理解构造函数的实现过程

原生实现

function Person(name){ this.name = name; }; Person.prototype.getName = function(){ return this.name; } var a = new Person('sven'); console.log(a.name); console.log(a.getName()); console.log(Object.getPrototypeOf(a) === Person.prototype);

 代码实现

function Person(name){ this.name = name; }; Person.prototype.getName = function(){ return this.name; } var objectFactory = function(){ var obj = new Object(), Constructor = [].shift.call(arguments); obj.__proto__ = Constructor.prototype; var ret = Constructor.apply(obj, arguments); return typeof ret === "object" ? ret: obj; } var a = objectFactory(Person, "sven"); console.log(a.name); console.log(a.getName()); console.log(Object.getPrototypeOf(a) === Person.prototype);

下面的代码可以实现原生的效果，参考自JavaScript设计模式与开发实践，[p18-p20]