Solidity:創建簡易代幣
IPFS
在終端輸入
truffle create contract MyToken
創建
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// 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]; } }
在migrations資料夾新增
var HelloWorld = artifacts.require("HelloWorld"); var MyToken = artifacts.require("MyToken"); module.exports = function(deployer) { deployer.deploy(HelloWorld); deployer.deploy(MyToken); };
編譯
truffle compile
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開始部署,Run
truffle migrate
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Test
開啟console
truffle console let contract MyToken.deployed().then(instance => contract = instance)
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contract.balanceOf(accounts[0]) contract.balanceOf(accounts[1])
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contract.transfer(accounts[1], 123) contract.balanceOf(accounts[0]) contract.balanceOf.call(accounts[1])
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---
使用Remix測試:
(可以參考前面: {% post_link Remix-On-Vscode '在VSCode上使用Remix' %})
1.啟動ganache-cli
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2.使用remix連接local測試網
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3.編譯並部屬
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4.測試
先呼叫部屬者,並從output中觀察結果
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接著轉5000,測試轉帳功能
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再看一次部屬者的Balance
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最後看轉Token過去的account
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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。
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