Composer version rollback version switching

see composer current version

1	composer -v

To roll back to composer edition 1, Just execute the following command

1	composer self-update --1

When you want to go back to version 2 when （ After updating or removing incompatible plug-ins , You should do this ）

1	composer self-update --2

Switch to the specified version

1	composer self-update 2.0.14