napi_unwrap

napi_status napi_unwrap(napi_env env,
                        napi_value js_object,
                        void** result); 拷贝

• [in] env：调用 API 的环境。

  ¥[in] env: The environment that the API is invoked under.

• [in] js_object：与原生实例关联的对象。

  ¥[in] js_object: The object associated with the native instance.

• [out] result：指向封装的原生实例的指针。

  ¥[out] result: Pointer to the wrapped native instance.

如果 API 成功，则返回 napi_ok。

¥Returns napi_ok if the API succeeded.

使用 napi_wrap() 检索先前封装在 JavaScript 对象中的原生实例。

¥Retrieves a native instance that was previously wrapped in a JavaScript object using napi_wrap().

当 JavaScript 代码调用类上的方法或属性访问器时，将调用相应的 napi_callback。如果回调用于实例方法或访问器，则回调的 this 参数是封装器对象；然后可以通过在封装对象上调用 napi_unwrap() 来获得作为调用目标的封装 C++ 实例。

¥When JavaScript code invokes a method or property accessor on the class, the corresponding napi_callback is invoked. If the callback is for an instance method or accessor, then the this argument to the callback is the wrapper object; the wrapped C++ instance that is the target of the call can be obtained then by calling napi_unwrap() on the wrapper object.