不在 index.js 里引入 Action.js，避免循环引入。

index.js

@@ -1,4 +1,4 @@
-const Action = require('./Action.js')
+// const Action = require('./Action.js')  // 不要在 index 里引入 Action，避免循环无限引入。
 const ActionTransfer = require('./ActionTransfer.js')
 const ActionStore = require('./ActionStore.js')
 const ActionMultisig = require('./ActionMultisig.js')
@@ -6,10 +6,10 @@ const ActionLockProof = require('./ActionLockProof.js')
 const ActionTac = require('./ActionTac.js')
 
 module.exports = {
-	Action,
+//	Action,
     ActionTransfer,
     ActionStore,
     ActionMultisig,
     ActionLockProof,
-    ActionTac
+//    ActionTac
 }