在这个辞旧迎新之际，先给大家拜个早年！祝大家新年快乐，龙年继续努力！ 这篇文章主要介绍一下适合初学者学习的一个游戏网站
🤔今天给大家介绍一下这个适合小白学习的僵尸游戏，可以一边学习一边看到效果，以下是学习链接
加密僵尸游戏中文版。cryptozombies.io/zh/course/
为什么选择这个，请听我细细道来
在教程中我选择了两个我认为比较适合初学者学习的两个章节，我们可以看到图中的内容
第一章的内容有以下几点：
1、solidity语言的编码知识，主要是介绍solidity的特性和编码方式
2、ERC721非同质化货币的概念和相关的接口标准
3、web3.js主要用于和solidity智能合约进行交互，前端主要使用web3.js相关的接口，实例化智能合约的ABI和Address，使用合约实例去调用方法，与WEB2有些许的不同
第二章的内容有以下几点：
1、Truffle，那么什么是truffle呢，相当于java中的sringcloud或者是vue脚手架，使用truffle，能够帮我们实例化一个基础的项目，里面包含以下的目录，学习truffle，能够帮助我们去编译、测试、部署我们的合约代码
build目录是我们使用truffle migration时，会将我们的solidity代码编译生成.json格式的文件，文件中的内容是用于web3.js用来实例化与链上的solidity交互
contracts目录中包含的是solidity开发的后端代码
migrations则是我们编写的编译规则，需要编译的solidity
test目录则是存放我们编写的测试用例，用来在不部署合约的情况下测试我们的代码
预言机
我的理解，预言机也是寻常的solidity，根据学习课程的用例，描述预言机是用来访问链下的数据，但是交互逻辑是，链下的数据通过前端获取，前端A执行更新的预言机B接口，预言机B接口回调了我们需要更新的C实例接口进行更新并发送事件，前端A根据监听事件知道更新成功，就获取C实例的数据进行展示
以下是上述几个目录的样例内容
migrations则是我们编写的编译规则
const NoahNFT = artifacts.require("NoahNFT");
// const { copyAbiFile, updateEnvFile } = require("../../utils/deploy");
module.exports = function (deployer) {
deployer.deploy(NoahNFT, 'name:Noah', 'symbol:NOAH', 'baseURI:https://gateway.pinata.cloud/ipfs/').then(() => {
// const { address } = NoahNFT;
// copyAbiFile('noah-nft');
// updateEnvFile('NFT_CONTRACT_ADDRESS', address);
});
};
test目录的内容
const MetaCoin = artifacts.require("NoahNFT");
contract("MetaCoin", (accounts) => {
it("should put 10000 MetaCoin in the first account", async () => {
const metaCoinInstance = await MetaCoin.deployed();
const balance = await metaCoinInstance.balanceOf(accounts[0]);
assert.equal(balance.valueOf(), 0, "10000 wasn't in the first account");
});
it("should call a function that depends on a linked library", async () => {
const metaCoinInstance = await MetaCoin.deployed();
const metaCoinBalance = (
await metaCoinInstance.balanceOf(accounts[0])
).toNumber();
const metaCoinEthBalance = (
await metaCoinInstance.balanceOf(accounts[0])
).toNumber();
assert.equal(
metaCoinEthBalance,
2 * metaCoinBalance,
"Library function returned unexpected function, linkage may be broken"
);
});
it("should send coin correctly", async () => {
const metaCoinInstance = await MetaCoin.deployed();
// Setup 2 accounts.
const accountOne = accounts[0];
const accountTwo = accounts[1];
// Get initial balances of first and second account.
const accountOneStartingBalance = (
await metaCoinInstance.balanceOf(accountOne)
).toNumber();
const accountTwoStartingBalance = (
await metaCoinInstance.balanceOf(accountTwo)
).toNumber();
// Make transaction from first account to second.
const amount = 10;
await metaCoinInstance.transferFrom(accountOne,accountTwo, amount, { from: accountOne });
// Get balances of first and second account after the transactions.
const accountOneEndingBalance = (
await metaCoinInstance.balanceOf(accountOne)
).toNumber();
const accountTwoEndingBalance = (
await metaCoinInstance.balanceOf(accountTwo)
).toNumber();
assert.equal(
accountOneEndingBalance,
accountOneStartingBalance - amount,
"Amount wasn't correctly taken from the sender"
);
assert.equal(
accountTwoEndingBalance,
accountTwoStartingBalance + amount,
"Amount wasn't correctly sent to the receiver"
);
});
});
contracts目录
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IERC721 {
// 事件
event Transfer(
address indexed from,
address indexed to,
uint256 indexed tokenId
);
event Approval(
address indexed owner,
address indexed approved,
uint256 indexed tokenId
);
event ApprovalForAll(
address indexed owner,
address indexed operator,
bool approved
);
// 查询
function balanceOf(address owner) external view returns (uint256 balance);
function ownerOf(uint256 tokenId) external view returns (address owner);
// 转账
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
// 授权
function approve(address to, uint256 tokenId) external;
function getApproved(uint256 tokenId)
external
view
returns (address operator);
function setApprovalForAll(address operator, bool _approved) external;
function isApprovedForAll(address owner, address operator)
external
view
returns (bool);
}
interface IERC721Receiver {
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
interface IERC721Metadata {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function tokenURI(uint256 tokenId) external view returns (string memory);
}
build目录，编译出来的solidity代码
{
"contractName": "IERC721",
"abi": [
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"internalType": "address",
"name": "owner",
"type": "address"
},
{
"indexed": true,
"internalType": "address",
"name": "approved",
"type": "address"
},
{
"indexed": true,
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "Approval",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"internalType": "address",
"name": "owner",
"type": "address"
},
{
"indexed": true,
"internalType": "address",
"name": "operator",
"type": "address"
},
{
"indexed": false,
"internalType": "bool",
"name": "approved",
"type": "bool"
}
],
"name": "ApprovalForAll",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"internalType": "address",
"name": "from",
"type": "address"
},
{
"indexed": true,
"internalType": "address",
"name": "to",
"type": "address"
},
{
"indexed": true,
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
{
"inputs": [
{
"internalType": "address",
"name": "owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"internalType": "uint256",
"name": "balance",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "ownerOf",
"outputs": [
{
"internalType": "address",
"name": "owner",
"type": "address"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "from",
"type": "address"
},
{
"internalType": "address",
"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "safeTransferFrom",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "from",
"type": "address"
},
{
"internalType": "address",
"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
},
{
"internalType": "bytes",
"name": "data",
"type": "bytes"
}
],
"name": "safeTransferFrom",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "from",
"type": "address"
},
{
"internalType": "address",
"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "to",
"type": "address"
},
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "approve",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "uint256",
"name": "tokenId",
"type": "uint256"
}
],
"name": "getApproved",
"outputs": [
{
"internalType": "address",
"name": "operator",
"type": "address"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "operator",
"type": "address"
},
{
"internalType": "bool",
"name": "_approved",
"type": "bool"
}
],
"name": "setApprovalForAll",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{
"internalType": "address",
"name": "owner",
"type": "address"
},
{
"internalType": "address",
"name": "operator",
"type": "address"
}
],
"name": "isApprovedForAll",
"outputs": [
{
"internalType": "bool",
"name": "",
"type": "bool"
}
],
"stateMutability": "view",
"type": "function"
}
],
"metadata": "{\"compiler\":{\"version\":\"0.8.21+commit.d9974bed\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"approved\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"ApprovalForAll\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"balance\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"getApproved\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"}],\"name\":\"isApprovedForAll\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"ownerOf\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"},{\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"internalType\":\"bool\",\"name\":\"_approved\",\"type\":\"bool\"}],\"name\":\"setApprovalForAll\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"kind\":\"dev\",\"methods\":{},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"project:/contracts/IERC721.sol\":\"IERC721\"},\"evmVersion\":\"shanghai\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"project:/contracts/IERC721.sol\":{\"keccak256\":\"0x70be2d6bc1ab763925b82bde15c2c5fc3baed193998633f42c18c46c30eb914c\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://382ee7b3003bfaf140e5e8d29753bd1f2ef920c81527b3df86a77541636e065b\",\"dweb:/ipfs/QmVNxZw1P4mJrZ1WRTCeqTzn8NHpSGa9zhQLQ45TPo32FK\"]}},\"version\":1}",
"bytecode": "0x",
"deployedBytecode": "0x",
"immutableReferences": {},
"generatedSources": [],
"deployedGeneratedSources": [],
"sourceMap": "",
"deployedSourceMap": "",
"source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\ninterface IERC721 {\n // 事件\n event Transfer(\n address indexed from,\n address indexed to,\n uint256 indexed tokenId\n );\n event Approval(\n address indexed owner,\n address indexed approved,\n uint256 indexed tokenId\n );\n event ApprovalForAll(\n address indexed owner,\n address indexed operator,\n bool approved\n );\n\n // 查询\n function balanceOf(address owner) external view returns (uint256 balance);\n\n function ownerOf(uint256 tokenId) external view returns (address owner);\n\n // 转账\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n function safeTransferFrom(\n address from,\n address to,\n uint256 tokenId,\n bytes calldata data\n ) external;\n\n function transferFrom(\n address from,\n address to,\n uint256 tokenId\n ) external;\n\n // 授权\n function approve(address to, uint256 tokenId) external;\n\n function getApproved(uint256 tokenId)\n external\n view\n returns (address operator);\n\n function setApprovalForAll(address operator, bool _approved) external;\n\n function isApprovedForAll(address owner, address operator)\n external\n view\n returns (bool);\n}\n\ninterface IERC721Receiver {\n function onERC721Received(\n address operator,\n address from,\n uint256 tokenId,\n bytes calldata data\n ) external returns (bytes4);\n}\n\ninterface IERC721Metadata {\n function name() external view returns (string memory);\n\n function symbol() external view returns (string memory);\n\n function tokenURI(uint256 tokenId) external view returns (string memory);\n}\n",
"sourcePath": "E:\\随便玩玩\\web3-examples-main\\web3-test\\contracts\\IERC721.sol",
"ast": {
"absolutePath": "project:/contracts/IERC721.sol",
"exportedSymbols": {
"IERC721": [
109
],
"IERC721Metadata": [
141
],
"IERC721Receiver": [
123
]
},
"id": 142,
"license": "MIT",
"nodeType": "SourceUnit",
"nodes": [
{
"id": 11,
"literals": [
"solidity",
"^",
"0.8",
".0"
],
"nodeType": "PragmaDirective",
"src": "33:23:1"
},
{
"abstract": false,
"baseContracts": [],
"canonicalName": "IERC721",
"contractDependencies": [],
"contractKind": "interface",
"fullyImplemented": false,
"id": 109,
"linearizedBaseContracts": [
109
],
"name": "IERC721",
"nameLocation": "68:7:1",
"nodeType": "ContractDefinition",
"nodes": [
{
"anonymous": false,
"eventSelector": "ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"id": 19,
"name": "Transfer",
"nameLocation": "102:8:1",
"nodeType": "EventDefinition",
"parameters": {
"id": 18,
"nodeType": "ParameterList",
"parameters": [
{
"constant": false,
"id": 13,
"indexed": true,
"mutability": "mutable",
"name": "from",
"nameLocation": "136:4:1",
"nodeType": "VariableDeclaration",
"scope": 19,
"src": "120:20:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
},
"typeName": {
"id": 12,
"name": "address",
"nodeType": "ElementaryTypeName",
"src": "120:7:1",
"stateMutability": "nonpayable",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
}
},
"visibility": "internal"
},
{
"constant": false,
"id": 15,
"indexed": true,
"mutability": "mutable",
"name": "to",
"nameLocation": "166:2:1",
"nodeType": "VariableDeclaration",
"scope": 19,
"src": "150:18:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
},
"typeName": {
"id": 14,
"name": "address",
"nodeType": "ElementaryTypeName",
"src": "150:7:1",
"stateMutability": "nonpayable",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
}
},
"visibility": "internal"
},
{
"constant": false,
"id": 17,
"indexed": true,
"mutability": "mutable",
"name": "tokenId",
"nameLocation": "194:7:1",
"nodeType": "VariableDeclaration",
"scope": 19,
"src": "178:23:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_uint256",
"typeString": "uint256"
},
"typeName": {
"id": 16,
"name": "uint256",
"nodeType": "ElementaryTypeName",
"src": "178:7:1",
"typeDescriptions": {
"typeIdentifier": "t_uint256",
"typeString": "uint256"
}
},
"visibility": "internal"
}
],
"src": "110:97:1"
},
"src": "96:112:1"
},
{
"anonymous": false,
"eventSelector": "8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925",
"id": 27,
"name": "Approval",
"nameLocation": "219:8:1",
"nodeType": "EventDefinition",
"parameters": {
"id": 26,
"nodeType": "ParameterList",
"parameters": [
{
"constant": false,
"id": 21,
"indexed": true,
"mutability": "mutable",
"name": "owner",
"nameLocation": "253:5:1",
"nodeType": "VariableDeclaration",
"scope": 27,
"src": "237:21:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
},
"typeName": {
"id": 20,
"name": "address",
"nodeType": "ElementaryTypeName",
"src": "237:7:1",
"stateMutability": "nonpayable",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
}
},
"visibility": "internal"
},
{
"constant": false,
"id": 23,
"indexed": true,
"mutability": "mutable",
"name": "approved",
"nameLocation": "284:8:1",
"nodeType": "VariableDeclaration",
"scope": 27,
"src": "268:24:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
},
"typeName": {
"id": 22,
"name": "address",
"nodeType": "ElementaryTypeName",
"src": "268:7:1",
"stateMutability": "nonpayable",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
}
},
"visibility": "internal"
},
{
"constant": false,
"id": 25,
"indexed": true,
"mutability": "mutable",
"name": "tokenId",
"nameLocation": "318:7:1",
"nodeType": "VariableDeclaration",
"scope": 27,
"src": "302:23:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_uint256",
"typeString": "uint256"
},
"typeName": {
"id": 24,
"name": "uint256",
"nodeType": "ElementaryTypeName",
"src": "302:7:1",
"typeDescriptions": {
"typeIdentifier": "t_uint256",
"typeString": "uint256"
}
},
"visibility": "internal"
}
],
"src": "227:104:1"
},
"src": "213:119:1"
},
{
"anonymous": false,
"eventSelector": "17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31",
"id": 35,
"name": "ApprovalForAll",
"nameLocation": "343:14:1",
"nodeType": "EventDefinition",
"parameters": {
"id": 34,
"nodeType": "ParameterList",
"parameters": [
{
"constant": false,
"id": 29,
"indexed": true,
"mutability": "mutable",
"name": "owner",
"nameLocation": "383:5:1",
"nodeType": "VariableDeclaration",
"scope": 35,
"src": "367:21:1",
"stateVariable": false,
"storageLocation": "default",
"typeDescriptions": {
"typeIdentifier": "t_address",
"typeString": "address"
},
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