要使用AWS ECS预留任务，您需要使用AWS CLI或AWS SDK进行编程。

以下是使用AWS CLI创建和管理AWS ECS预留任务的示例代码：

1. 创建预留任务：

aws ecs create-reservation \
    --cli-input-json '{
        "cliVersion": "2016-11-01",
        "tasks": [
            {
                "taskDefinitionArn": "arn:aws:ecs:us-west-2:123456789012:task-definition/my-task-def:1",
                "capacityProviderStrategy": [
                    {
                        "capacityProvider": "FARGATE",
                        "weight": 1
                    }
                ],
                "platformVersion": "LATEST"
            }
        ]
    }'

2. 列出预留任务：

aws ecs describe-reservations

3. 查看预留任务详情：

aws ecs describe-reservations --reservation-arns arn:aws:ecs:us-west-2:123456789012:reservation/my-reservation-arn

4. 更新预留任务：

aws ecs update-reservation \
    --reservation-arn arn:aws:ecs:us-west-2:123456789012:reservation/my-reservation-arn \
    --cli-input-json '{
        "cliVersion": "2016-11-01",
        "tasks": [
            {
                "taskDefinitionArn": "arn:aws:ecs:us-west-2:123456789012:task-definition/my-updated-task-def:1",
                "capacityProviderStrategy": [
                    {
                        "capacityProvider": "FARGATE",
                        "weight": 1
                    }
                ]
            }
        ]
    }'

5. 删除预留任务：

aws ecs delete-reservation --reservation-arn arn:aws:ecs:us-west-2:123456789012:reservation/my-reservation-arn

请注意，上述示例中的ARN、容器定义等值应根据您的环境进行相应替换。