当你铸造代币时，你会增加供应量并将新代币转移到特定的代币账户。

import {
  clusterApiUrl,
  Connection,
  PublicKey,
  Keypair,
  Transaction,
  sendAndConfirmTransaction,
} from "@solana/web3.js";
import {
  createMintToCheckedInstruction,
  mintToChecked,
} from "@solana/spl-token";
import bs58 from "bs58";

(async () => {
  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
  const feePayer = Keypair.fromSecretKey(
    bs58.decode(
      "588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2",
    ),
  );

  // G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
  const alice = Keypair.fromSecretKey(
    bs58.decode(
      "4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp",
    ),
  );

  const mintPubkey = new PublicKey(
    "8mAKLjGGmjKTnmcXeyr3pr7iX13xXVjJJiL6RujDbSPV",
  );

  const tokenAccountPubkey = new PublicKey(
    "2XYiFjmU1pCXmC2QfEAghk6S7UADseupkNQdnRBXszD5",
  );

  // 1) use build-in function
  {
    let txhash = await mintToChecked(
      connection, // connection
      feePayer, // fee payer
      mintPubkey, // mint
      tokenAccountPubkey, // receiver (should be a token account)
      alice, // mint authority
      1e8, // amount. if your decimals are 8, you mint 10^8 for 1 token.
      8, // decimals
    );
    console.log(`txhash: ${txhash}`);

    // if alice is a multisig account
    // let txhash = await mintToChecked(
    //   connection, // connection
    //   feePayer, // fee payer
    //   mintPubkey, // mint
    //   tokenAccountPubkey, // receiver (should be a token account)
    //   alice.publicKey, // !! mint authority pubkey !!
    //   1e8, // amount. if your decimals are 8, you mint 10^8 for 1 token.
    //   8, // decimals
    //   [signer1, signer2 ...],
    // );
  }

  // or

  // 2) compose by yourself
  {
    let tx = new Transaction().add(
      createMintToCheckedInstruction(
        mintPubkey, // mint
        tokenAccountPubkey, // receiver (should be a token account)
        alice.publicKey, // mint authority
        1e8, // amount. if your decimals is 8, you mint 10^8 for 1 token.
        8, // decimals
        // [signer1, signer2 ...], // only multisig account will use
      ),
    );
    console.log(
      `txhash: ${await sendAndConfirmTransaction(connection, tx, [
        feePayer,
        alice /* fee payer + mint authority */,
      ])}`,
    );
  }
})();

https://solana.com/zh/developers/cookbook/tokens/mint-tokens

代币账户有代币余额，只需一次调用即可检索

web3.js

import { clusterApiUrl, Connection, PublicKey } from "@solana/web3.js";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  const tokenAccount = new PublicKey(
    "FWZedVtyKQtP4CXhT7XDnLidRADrJknmZGA2qNjpTPg8",
  );

  let tokenAmount = await connection.getTokenAccountBalance(tokenAccount);
  console.log(`amount: ${tokenAmount.value.amount}`);
  console.log(`decimals: ${tokenAmount.value.decimals}`);
})();

Rust

use solana_client::rpc_client::RpcClient;
use solana_program::pubkey::Pubkey;
use solana_sdk::commitment_config::CommitmentConfig;
use std::str::FromStr;

fn main() {
    let rpc_url = String::from("https://api.devnet.solana.com");
    let connection = RpcClient::new_with_commitment(rpc_url, CommitmentConfig::confirmed());

    let token_account = Pubkey::from_str("FWZedVtyKQtP4CXhT7XDnLidRADrJknmZGA2qNjpTPg8").unwrap();
    let balance = connection
        .get_token_account_balance(&token_account)
        .unwrap();

    println!("amount: {}, decimals: {}", balance.amount, balance.decimals);
}

https://solana.com/zh/developers/cookbook/tokens/get-token-balance

每个代币账户都包含有关代币的信息，例如所有者、铸币厂、金额（余额）。

import { clusterApiUrl, Connection, PublicKey } from "@solana/web3.js";
import { getAccount } from "@solana/spl-token";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  const tokenAccountPubkey = new PublicKey(
    "2XYiFjmU1pCXmC2QfEAghk6S7UADseupkNQdnRBXszD5",
  );

  let tokenAccount = await getAccount(connection, tokenAccountPubkey);
  console.log(tokenAccount);
  /*
  {
    address: PublicKey {
      _bn: <BN: 16aef79dfadb39ffedb3b6f77688b8c162b18bb9cba2ffefe152303629ae3030>
    },
    mint: PublicKey {
      _bn: <BN: 7351e5e067cc7cfefef42e78915d3c513edbb8adeeab4d9092e814fe68c39fec>
    },
    owner: PublicKey {
      _bn: <BN: df30e6ca0981c1a677eed6f7cb46b2aa442ca9b7a10a10e494badea4b9b6944f>
    },
    amount: 0n,
    delegate: null,
    delegatedAmount: 0n,
    isInitialized: true,
    isFrozen: false,
    isNative: false,
    rentExemptReserve: null,
    closeAuthority: null
  }
  */
})();

https://solana.com/zh/developers/cookbook/tokens/get-token-account

用户需要一个代币账户来持有代币。
用户对其拥有的每种类型的代币至少拥有一个代币账户。
关联代币账户是针对每个密钥对确定性创建的账户。ATA 是管理代币账户的推荐方法。

import {
  clusterApiUrl,
  Connection,
  PublicKey,
  Keypair,
  Transaction,
  sendAndConfirmTransaction,
} from "@solana/web3.js";
import {
  createAssociatedTokenAccount,
  getAssociatedTokenAddress,
  createAssociatedTokenAccountInstruction,
} from "@solana/spl-token";
import bs58 from "bs58";

(async () => {
  // connection
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  // 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
  const feePayer = Keypair.fromSecretKey(
    bs58.decode(
      "588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2",
    ),
  );

  // G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
  const alice = Keypair.fromSecretKey(
    bs58.decode(
      "4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp",
    ),
  );

  const mintPubkey = new PublicKey(
    "2SKpuBU9ksneBZD4nqbZkw75NE11HsSHsGRtW2BZh5aQ",
  );

  // 1) use build-in function
  {
    let ata = await createAssociatedTokenAccount(
      connection, // connection
      feePayer, // fee payer
      mintPubkey, // mint
      alice.publicKey, // owner,
    );
    console.log(`ATA: ${ata.toBase58()}`);
  }

  // or

  // 2) composed by yourself
  {
    // calculate ATA
    let ata = await getAssociatedTokenAddress(
      mintPubkey, // mint
      alice.publicKey, // owner
    );
    console.log(`ATA: ${ata.toBase58()}`);

    // if your wallet is off-curve, you should use
    // let ata = await getAssociatedTokenAddress(
    //   mintPubkey, // mint
    //   alice.publicKey // owner
    //   true, // allowOwnerOffCurve
    // );

    let transaction = new Transaction().add(
      createAssociatedTokenAccountInstruction(
        feePayer.publicKey, // payer
        ata, // ata
        alice.publicKey, // owner
        mintPubkey, // mint
      ),
    );

    const signature = await sendAndConfirmTransaction(
      connection,
      transaction,
      [feePayer], // Signers
    );

    console.log(`txhash: ${await signature}`);
  }
})();

https://solana.com/zh/developers/cookbook/tokens/create-token-account

为了获取代币的当前供应量、权限或小数，您需要获取代币铸造的帐户信息

import { clusterApiUrl, Connection, PublicKey } from "@solana/web3.js";
import { getMint } from "@solana/spl-token";

(async () => {
  const connection = new Connection(clusterApiUrl("devnet"), "confirmed");

  const mintAccountPublicKey = new PublicKey(
    "8mAKLjGGmjKTnmcXeyr3pr7iX13xXVjJJiL6RujDbSPV",
  );

  let mintAccount = await getMint(connection, mintAccountPublicKey);

  console.log(mintAccount);
  /*
  {
    address: PublicKey {
      _bn: <BN: 7351e5e067cc7cfefef42e78915d3c513edbb8adeeab4d9092e814fe68c39fec>
    },
    mintAuthority: PublicKey {
      _bn: <BN: df30e6ca0981c1a677eed6f7cb46b2aa442ca9b7a10a10e494badea4b9b6944f>
    },
    supply: 0n,
    decimals: 8,
    isInitialized: true,
    freezeAuthority: PublicKey {
      _bn: <BN: df30e6ca0981c1a677eed6f7cb46b2aa442ca9b7a10a10e494badea4b9b6944f>
    }
  }
  */
})();

https://solana.com/zh/developers/cookbook/tokens/get-token-mint