Solidity:創建簡易代幣

truffle create contract MyToken

// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;

contract MyToken {
  uint INITIAL_SUPPLY = 10000;
  mapping(address => uint) balances;
  constructor() {
    balances[msg.sender] = INITIAL_SUPPLY;
  }

  // transfer token for a specified address
  function transfer(address _to, uint _amount) public {
    require(balances[msg.sender] > _amount);
    balances[msg.sender] -= _amount;
    balances[_to] += _amount;
  }
  // Get the balance of the specified address
  // Constant and Immutable State Variables. See https://docs.soliditylang.org/en/v0.8.10/contracts.html#modifiers
  function balanceOf(address _owner) public view returns (uint) {
    return balances[_owner];
  }
}

var HelloWorld = artifacts.require("HelloWorld");
var MyToken = artifacts.require("MyToken");

module.exports = function(deployer) {
  deployer.deploy(HelloWorld);
  deployer.deploy(MyToken);
};

truffle compile

truffle migrate

truffle console

let contract
MyToken.deployed().then(instance => contract = instance)

contract.balanceOf(accounts[0])
contract.balanceOf(accounts[1])

contract.transfer(accounts[1], 123)
contract.balanceOf(accounts[0])
contract.balanceOf.call(accounts[1])

完成，簡單的token生成與轉移token已經實現，但一般的Token我們會使用**ERC20**，而不會像這樣實現陽春的功能，會使用更嚴謹的方式來防止漏洞。