napi_is_buffer
napi_status napi_is_buffer(napi_env env, napi_value value, bool* result) - 
[in] env:调用 API 的环境。¥
[in] env: The environment that the API is invoked under. - 
[in] value:要检查的 JavaScript 值。¥
[in] value: The JavaScript value to check. - 
[out] result:给定的napi_value是否表示node::Buffer对象。¥
[out] result: Whether the givennapi_valuerepresents anode::Bufferobject. 
如果 API 成功,则返回 napi_ok。
¥Returns napi_ok if the API succeeded.
该 API 检查传入的 Object 是否为缓冲区。
¥This API checks if the Object passed in is a buffer.