interview conclusion

最近面试遇到一个关于object.create方法的实现，当时回答想到的方法是通过直接new一个参数，当时面试官提到没法保证参数是构造函数。回来看了一下underscore源码发现了一种实现方法。

    var baseCreate = function(prototype) {
       var Ctor = function(){};   //define a null function,used its prototype
         propertity with the prototype argument.
       if (!_.isObject(prototype)) return {};
       if (nativeCreate) return nativeCreate(prototype);
       // nativeCreate construct to the object.create function.
       Ctor.prototype = prototype;  //this is the important.
       var result = new Ctor;   //new a construct function.
       Ctor.prototype = null;   //clear the occupation.
       return result;
     };