napi_create_external

napi_status napi_create_external(napi_env env,
                                 void* data,
                                 napi_finalize finalize_cb,
                                 void* finalize_hint,
                                 napi_value* result) 拷贝

• [in] env：调用 API 的环境。

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

• [in] data：指向外部数据的原始指针。

  ¥[in] data: Raw pointer to the external data.

• [in] finalize_cb：收集外部值时调用的可选回调。napi_finalize 提供了更多详细信息。

  ¥[in] finalize_cb: Optional callback to call when the external value is being collected. napi_finalize provides more details.

• [in] finalize_hint：在收集期间传递给最终回调的可选提示。

  ¥[in] finalize_hint: Optional hint to pass to the finalize callback during collection.

• [out] result：表示外部值的 napi_value。

  ¥[out] result: A napi_value representing an external value.

如果 API 成功，则返回 napi_ok。

¥Returns napi_ok if the API succeeded.

此 API 分配一个附加有外部数据的 JavaScript 值。这用于通过 JavaScript 代码传递外部数据，因此稍后可以使用 napi_get_value_external 由原生代码检索。

¥This API allocates a JavaScript value with external data attached to it. This is used to pass external data through JavaScript code, so it can be retrieved later by native code using napi_get_value_external.

API 添加了一个 napi_finalize 回调，当刚刚创建的 JavaScript 对象被垃圾回收时将调用该回调。

¥The API adds a napi_finalize callback which will be called when the JavaScript object just created has been garbage collected.

创建的值不是对象，因此不支持附加属性。它被认为是一个独特的值类型：使用外部值调用 napi_typeof() 会产生 napi_external。

¥The created value is not an object, and therefore does not support additional properties. It is considered a distinct value type: calling napi_typeof() with an external value yields napi_external.