對象在從C++到節點對象回報（節點插件）

Question

我試圖返回下面的結構從C++到節點：

{ 
    "hello":"hello there!", 
    "obj": { 
     "name":"Karl", 
     "num":666 
    } 
} 

我不能看到包括Local<Object>到另一個Local<Object>正常。

這裏是代碼的主要部分：

Local<Object> obj = Object::New(isolate); 
obj->Set(String::NewFromUtf8(isolate, "hello"), String::NewFromUtf8(isolate, "hello there")); 
Local<Object> obj_lvl = Object::New(isolate); 
obj_lvl->Set(String::NewFromUtf8(isolate, "name"), String::NewFromUtf8(isolate, "Karl")); 
obj_lvl->Set(String::NewFromUtf8(isolate, "num"), Integer::New(isolate, 666)); 
// below here i am trying to include the object "obj_lvl" into the first object "obj" 
obj->Set(String::NewFromUtf8(isolate, "obj"), String::NewFromUtf8(isolate, obj_lvl)); // <--- error is here 

我得到的錯誤：

../count_node.cc:90:91: error: no matching function for call to ‘v8::String::NewFromUtf8(v8::Isolate*&, v8::Local<v8::Object>&)’ 
     obj->Set(String::NewFromUtf8(isolate, "obj"), String::NewFromUtf8(isolate, obj_lvl)); 

我一直在尋找一個教程，但他們要麼過時（0.12前）或者根本不存在。我正在使用節點版本v6.6.0（npm v3.10.3）和node-gyp版本v3.4.0。

還有什麼區別Integer::New(isolate, ...));和Number::New(isolate, ...));，一直看到這兩者。