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。

---