URLSession在errors和statusCode的作用域中找不到“self”

URLSession.shared.dataTask(with: urlRequest) { [weak self] (data, response, error) in
    // 使用weak self来避免循环引用
    guard let self = self else { return }
    
    // 在闭包内部可以使用self来引用当前对象
    if let error = error {
        print("请求失败：\(error.localizedDescription)")
        return
    }
    
    // 处理响应结果
    if let httpResponse = response as? HTTPURLResponse {
        let statusCode = httpResponse.statusCode
        print("响应状态码：\(statusCode)")
    }
}.resume()

URLSession.shared.dataTask(with: urlRequest) { [unowned self] (data, response, error) in
    // 使用unowned self来避免循环引用，需要确保闭包不会在self释放后再被调用
    if let error = error {
        print("请求失败：\(error.localizedDescription)")
        return
    }
    
    // 处理响应结果
    if let httpResponse = response as? HTTPURLResponse {
        let statusCode = httpResponse.statusCode
        print("响应状态码：\(statusCode)")
    }
}.resume()