jimmychu0807

yarn add @polkadot/keyring

jimmychu0807

// 引入
import { ApiPromise, WsProvider } from '@polkadot/api';

// 創建 api 對象
const wsProvider = new WsProvider('ws://localhost:9944');
const api = await ApiPromise.create({ provider: wsProvider });

// 簡單測試-讀取常量
console.log(api.consts.balances.transactionByteFee.toNumber());

jimmychu0807

// 從 Alice 提交一個交易給另一用戶
const unsub = await api.tx.balances
  .transfer(recipient, 12345)
  .signAndSend(alice, ({ eventRecords = [], status }) => {
    console.log(`Current status is ${status.type}`);

    if (status.isInBlock) {
      console.log(`Transaction included at blockHash ${status.asInBlock}`);
    } else if (status.isFinalized) {
      console.log(`Transaction finalized at blockHash ${status.asFinalized}`);

jimmychu0807

yarn add @polkadot/api

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// 初始化 `api` 對象
const api = ...;

// 取得鏈上的時間戳
const now = await api.query.timestamp.now();

// 一個模擬地址
const ADDR = '5DTestUPts3kjeXSTMyerHihn1uwMfLj8vU8sqF7qYrFabHE';

// 取得用戶地址中的餘額

jimmychu0807

// 引入
import { Keyring } from '@polkadot/api';

// 初始化 api
// const api = await ...;

// api 完成初始化後，再創建 keyring 對象。
const keyring = new Keyring({ type: 'sr25519' });

jimmychu0807

const api = await ApiPromise.create({
  ...,
  types: {
    Price: {
      dollars: 'u32',
      cents: 'u32',
      currency: 'Vec<u8>',
    }
  }
});

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// ...

// 一個模擬地址
const recipient = '5DTestUPts3kjeXSTMyerHihn1uwMfLj8vU8sqF7qYrFabHE';

// Sign and send a transfer from Alice to Bob
const txHash = await api.tx.balances
  .transfer(recipient, 12345)
  .signAndSend(alice);

jimmychu0807

yarn add @polkadot/types

jimmychu0807

// 引入一些幫助函數
import { stringToU8a, u8aToHex } from '@polkadot/util';

// 創建信息
const message = stringToU8a('a testing message');
// 簽署信息
const signature = alice.sign(message);
// 覈實信息
const isValid = alice.verify(message, signature);