獲取自定義對象的構造函數名稱

Question

我前幾天做了一個控制檯應用程序，我想在控制檯中的值之前打印數據類型。

我想用new關鍵字創建一個對象來檢索構造函數的名稱，但我有困難。

是否有任何其他方式來檢索構造函數名稱。我無法用自定義構造函數屬性引用修改原型。

function Thing(name){ 
 
    this._name = name; 
 
} 
 

 
Thing.prototype = { 
 
    /* 
 
    I cant do these 
 
    constructor: Thing, 
 
    toString: function(){ 
 
    return [object Thing]; 
 
    }, 
 
    */ 
 
    name: function(name){ 
 
    return name != null 
 
     ? (this._name = name) 
 
     : name; 
 
    } 
 
} 
 

 
var thing = new Thing('andrew'); 
 

 
// I have tried the following without success as it seems to be created by Object not Thing 
 
console.log(thing.constructor); 
 
console.log(thing.constructor.name); 
 
console.log(thing.constructor.toString()); 
 
console.log(Thing); 
 
console.log(Thing.prototype); 
 
console.log(Object.getPrototypeOf(thing)); 
 
console.log(Object.prototype.toString.call(thing)); 
 

 
// test whether thing is instanceof Thing 
 
console.log('is it a thing?', thing instanceof Thing);

<script src="http://codepen.io/synthet1c/pen/WrQapG.js"></script>

Answer 1

一個對象不分配給原型， 每個屬性分配給現有的原型的對象

function Thing(name){ 
    this._name = name; 
} 

Thing.prototype.name = function(name){ 
    return name != null 
     ? (this._name = name) 
     : name; 
} 

var thing = new Thing('andrew'); 

console.log(thing.constructor.name);