要实现AWS负载均衡器（Application Load Balancer或Classic Load Balancer）和ECS容器位于不同的VPCs上，可以按照以下步骤操作：

1. 创建两个VPC：一个用于负载均衡器（Load Balancer VPC），另一个用于ECS容器（ECS VPC）。
2. 在每个VPC中创建子网，并确保它们在不同的可用区（Availability Zone）中。
3. 在Load Balancer VPC中创建一个负载均衡器。以下是使用AWS CDK创建Application Load Balancer（ALB）的示例代码：

from aws_cdk import aws_elasticloadbalancingv2 as elbv2, core

class LoadBalancerStack(core.Stack):
    def __init__(self, scope: core.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        lb_vpc = ec2.Vpc(self, "LoadBalancerVPC",
            cidr="10.0.0.0/16",
            max_azs=2,
            subnet_configuration=[
                ec2.SubnetConfiguration(
                    name="Public",
                    subnet_type=ec2.SubnetType.PUBLIC
                )
            ]
        )

        lb = elbv2.ApplicationLoadBalancer(self, "LoadBalancer",
            vpc=lb_vpc,
            internet_facing=True,
            security_group=ec2.SecurityGroup(self, "LoadBalancerSecurityGroup", vpc=lb_vpc)
        )

        listener = lb.add_listener("Listener", port=80)

        # 添加目标组和目标，连接到ECS容器的VPC
        ecs_vpc_id = 'vpc-xxxxxxx'  # ECS容器的VPC ID
        ecs_vpc = ec2.Vpc.from_lookup(self, 'ECSVPC', vpc_id=ecs_vpc_id)
        ecs_target_group = listener.add_targets("ECSTargetGroup",
            port=80,
            targets=[elbv2.InstanceTarget(instance_id="i-xxxxxxxx", port=80)],  # ECS容器的实例ID
            vpc=ecs_vpc
        )

4. 在ECS VPC中创建一个ECS集群和任务定义。以下是使用AWS CDK创建ECS集群和任务定义的示例代码：

from aws_cdk import aws_ec2 as ec2, aws_ecs as ecs, core

class EcsStack(core.Stack):
    def __init__(self, scope: core.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        ecs_vpc = ec2.Vpc(self, "ECSVPC",
            cidr="10.0.0.0/16",
            max_azs=2,
            subnet_configuration=[
                ec2.SubnetConfiguration(
                    name="Private",
                    subnet_type=ec2.SubnetType.PRIVATE
                )
            ]
        )

        cluster = ecs.Cluster(self, "ECSCluster",
            vpc=ecs_vpc
        )

        task_definition = ecs.FargateTaskDefinition(self, "FargateTaskDefinition")

        container = task_definition.add_container("Container",
            image=ecs.ContainerImage.from_registry("nginx:latest"),
            memory_limit_mib=512
        )

        service = ecs.FargateService(self, "FargateService",
            cluster=cluster,
            task_definition=task_definition,
            vpc_subnets=ec2.SubnetSelection(subnet_type=ec2.SubnetType.PRIVATE)
        )

请根据自己的实际情况修改上述代码中的VPC ID、子网配置、安全组等参数。