ECS realize his purchase page need to use the API

1. Query area that can be purchased

DescribeRegions

To the Senate:

• Pay Type: instanceChargeType (optional), Value: PrePaid | PostPaid, representing the package monthly subscription | pay by volume

2. Inquiries can be made available to purchase area

DescribeAvailableResource

To the Senate:

• Pay Type: instanceChargeType (required), PrePaid | PostPaid
• Regional: regionId (required)
• Target resource to be queried: destinationResource = Zone

3. query instance specification can be purchased

DescribeAvailableResource

To the Senate:

• Regional: regionId (required)
• Available area: zoneId (optional)
• I / O 优化: ioOptimized = optimized
• Target resource to be queried: destinationResource = InstanceType

4. Query real