什麼應該是構造函數屬性值..a原型構造函數或對象構造函數本身

Question

問題：爲什麼p1的構造函數出現爲Person.Shouldn't它是人嗎？

function Person() 
{ 
this.type='person' 
} 
function Man() 
{ 
this.type='Man' 
} 

Man.prototype=new Person(); 

var p1=new Man(); 
console.log('p1\'s constructor is:'+p1.constructor); 
console.log('p1 is instance of Man:'+(p1 instanceof Man)); 
console.log('p1 is instance of Person:'+(p1 instanceof Person)); 

http://jsfiddle.net/GSXVX/

Answer 1

時改寫原prototype對象時，破壞了原有的.constructor財產......

Man.prototype = new Person(); 

您可以手動替換它，但除非你做這將是一個枚舉屬性在不可枚舉的（在ES5實現中）。

Man.prototype=new Person(); 
Man.prototype.constructor = Man; // This will be enumerable. 

---

// ES5 lets you make it non-enumerable 
Man.prototype=new Person(); 
Object.defineProperty(Man.prototype, 'constructor', { 
    value: Man, 
    enumerable: false, 
    configurable: true, 
    writable: true 
});