如何從現有對象的構造函數在javascript

Question

一個新的對象考慮下面的JavaScript代碼：

if (oo instanceof MyType) { 
    var newObj = new oo.constructor; 

    // suppose the following check should be ok but it is not 
    // newObj should have same constructor as its original oo. 

    if (newObj instanceof MyType) { 
     // do something 
    } 
} 

我不能達到「做一些事情」。怎麼了？

Answer 1

好吧，僅僅因爲你可能沒有閱讀評論，你在constructor（它說constractor）有一個錯字。

這工作：

function MyType() {} 
oo = new MyType(); 

if(oo instanceof MyType) 
    { 
     var newObj = new oo.constructor(); // The mistake was in this line 

     if(newObj instanceof MyType) 
     { 
      console.log("a contractor was killed by a constrictor while constructing"); 
     } 
    }