扩展： 创建一个新的Call方法 */.

NewExtrinsic creates a new Extrinsic from the provided Call.

SetSerDeOptions overrides default serialise and deserialize options.

v0 is unknown.

https://github.com/polkadot-js/api/packages/types/src/interfaces/system/types.ts p13 */.

Call is the extrinsic function descriptor.

Callindex is a 16 bit wrapper around the `[sectionIndex, methodIndex]` value that uniquely identifies a method.

Extrinsic is a piece of Args bundled into a block that expresses something from the "external" (i.e.

AccountInfo contains information of an account.

.

Args are the encoded arguments for a Call.