Web3js 小笔记
Web3js
区块链是一个由区块组成的列表，这些块的内容基本是交易记录，每个交易都有一个附加的交易日志，事件结果存放在交易日志里。合约发出的时间，可以使用合约地址访问
基本使用
入门认知
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))
console.log(web3)
查看 web3 连接的节点信息
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))web3.eth.getNodeInfo().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-JFIpjIPd-1643027019279)(C:\Users\Lenovo\AppData\Local\Temp\1642950429162.png)]
查看是否连接到节点
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))web3.eth.net.isListening().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-gKiGPoBY-1643027019280)(C:\Users\Lenovo\AppData\Local\Temp\1642950545009.png)]
获取当前连接网络的 id
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))web3.eth.net.getId().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0TO6aeDn-1643027019282)(C:\Users\Lenovo\AppData\Local\Temp\1642950737493.png)]
Provider 相关
查看当前 web3 provider
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))console.log(web3.currentProvider)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hjCu6Bve-1643027019282)(C:\Users\Lenovo\AppData\Local\Temp\1642951277107.png)]
设置/修改 provider
其实就是临时修改为其他的 provider
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))web3.setProvider(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))
批处理
批处理请求就是将几个请求打包在一起提交
可以保证交易顺序
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))var abi = [{"inputs": [],"name": "getNumber","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "uint256","name": "_number","type": "uint256"}],"name": "setNumber","outputs": [],"stateMutability": "nonpayable","type": "function"}
]
var address = "0x28A6FDdD4925386A5b5D8e339dF9A073fE8e74A4"var contract = new web3.eth.Contract(abi, address)function callback1() {console.log("callback run 1")
}function callback2() {console.log("callback run 2")
}// 创建批处理对象
var batch = new web3.BatchRequest()// 添加事务
batch.add(web3.eth.getBalance.request('0x9EC38bFa98Ff2AF34081544BE0d1aA9C709D8283', 'latest', function(error, res) {if (error) {console.log("s")}
}))
大数据处理工具
以太坊内部总是以 wei 来表示余额（大整数），只有显示余额的时候，才转换为 ether 或其他单位。JavaScript 中默认的数字精度无法确切地表示 weiwebjs 中，自带 BigNumber 库1 wei = 10 ^ 8
var BigNumber = require("bignumber.js")
var balance = new BigNumber("111111111111111111111111111111111111111111111111111");
console.log(balance)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-IIu5F2zt-1643027019283)(C:\Users\Lenovo\AppData\Local\Temp\1642990205043.png)]
转化为十进制显示出来
默认保留小数点 20 位
var BigNumber = require("bignumber.js")
var balance = new BigNumber("111111111111111111111111111111111111111111111111111");
console.log(balance.toString(10))
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-Gy29wtOQ-1643027019284)(C:\Users\Lenovo\AppData\Local\Temp\1642990424963.png)]
检查参数
var BigNumber = require("bignumber.js")
var balance = new BigNumber("111111111111111111111111111111111111111111111111111");
var number = balance.toString(10)var res = web3.utils.isBigNumber(number)
console.log(res)res = web3.utils.isBigNumber(balance)
console.log(res)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-quezeQih-1643027019285)(C:\Users\Lenovo\AppData\Local\Temp\1642990785516.png)]
数值转换
wei 是最小的以太单位
console.log(web3.utils.fromWei('1', 'ether'))
console.log(web3.utils.fromWei('1', 'finney'))
console.log(web3.utils.fromWei('1', 'szabo'))
console.log(web3.utils.fromWei('1', 'shannon'))
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-qEHPUJyK-1643027019285)(C:\Users\Lenovo\AppData\Local\Temp\1642991061161.png)]
将给定的以太金额转换为以 wei 为单位的数值
console.log(web3.utils.toWei('1', 'ether')) console.log(web3.utils.toWei('1', 'finney')) console.log(web3.utils.toWei('1', 'szabo')) console.log(web3.utils.toWei('1', 'shannon'))[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-wXy7VFei-1643027019286)(C:\Users\Lenovo\AppData\Local\Temp\1642991201744.png)]
任意值转换为 16 进制字符串
数值字符串将解析为数值 文本字符串将解析为 utf8 字符串console.log(web3.utils.toHex('234')) console.log(web3.utils.toHex(234))[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-zhHZgOyy-1643027019287)(C:\Users\Lenovo\AppData\Local\Temp\1642991355934.png)]
16 进制字符串转化为数值字符串
console.log(web3.utils.hexToNumberString('0xea'))[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-lPEaVjKx-1643027019288)(C:\Users\Lenovo\AppData\Local\Temp\1642991535524.png)]
杂七杂八转换
console.log(web3.utils.asciiToHex('abcdef')) console.log(web3.utils.hexToBytes('0x616263ea')) console.log(web3.utils.bytesToHex([97, 98, 99, 234]))[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-I6LjeSHK-1643027019289)(C:\Users\Lenovo\AppData\Local\Temp\1642991848259.png)]
检查是否为地址
console.log(web3.utils.isAddress('0x5B38Da6a701c568545dCfcB03FcB875f56beddC4'))[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-o0oSgxeH-1643027019289)(C:\Users\Lenovo\AppData\Local\Temp\1642992107282.png)]
区块操作
获取最新区块号
web3.eth.getBlockNumber().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-V8H61W0s-1643027019290)(C:\Users\Lenovo\AppData\Local\Temp\1642992357531.png)]
指定块编号或块哈希对应的块
// 最新的块
web3.eth.getBlock('latest').then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-sOAtKFXX-1643027019290)(C:\Users\Lenovo\AppData\Local\Temp\1642992923572.png)]
指定块的交易信息
web3.eth.getTransactionFromBlock('0x7fd5f696177d03b7dd882a93c18f6cfbe3fac8240f2c98f27c08c4586793e620', 0).then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ap5oRLwv-1643027019291)(C:\Users\Lenovo\AppData\Local\Temp\1642993710754.png)]
指定账号发出的交易数量
web3.eth.getBlockTransactionCount('0x7fd5f696177d03b7dd882a93c18f6cfbe3fac8240f2c98f27c08c4586793e620').then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-FkRbQ6ru-1643027019291)(C:\Users\Lenovo\AppData\Local\Temp\1642993859176.png)]
账户相关操作
查询账户个数
返回当前节点控制的账户列表
web3.eth.getAccounts().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-ILX3whhx-1643027019292)(C:\Users\Lenovo\AppData\Local\Temp\1642994036484.png)]
创建账户
web3.eth.personal.newAccount('!@abc').then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-8LTjywcE-1643027019292)(C:\Users\Lenovo\AppData\Local\Temp\1642994386885.png)]
获得奖励的账户地址
web3.eth.getCoinbase().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hvqayT1F-1643027019293)(C:\Users\Lenovo\AppData\Local\Temp\1642994468876.png)]
是否正在挖矿
web3.eth.isMining().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-XrlKTarO-1643027019293)(C:\Users\Lenovo\AppData\Local\Temp\1642994513355.png)]
交易相关
查询余额
获取指定块中特定只能账户地址的余额
web3.eth.getBalance(address [, defaultBlock] [, callback])
- defaultBlock：表执行到指定的区块时的余额
- 区块号
- 区块的 hash 值
- 字符串 “earliest”、“latest”、“pending”
web3.eth.getBalance('0x956188a6bD41694BdB13AA5CE168543a03B74770', function(error, result) {if (error) {console.log("something error.")} else {var balance = result.toString()console.log(web3.utils.fromWei(balance, "ether"))}
})
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-EIpyyZF9-1643027019294)(C:\Users\Lenovo\AppData\Local\Temp\1642998200244.png)]
查询平均 gas 价格
获取当前 gas 价格，该价格由最近的若干块的 gas 价格中值决定
web3.eth.getGasPrice().then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-LU9szHhI-1643027019294)(C:\Users\Lenovo\AppData\Local\Temp\1643001582680.png)]
发送交易
var transactionObject = {from: '0x956188a6bD41694BdB13AA5CE168543a03B74770',to: '0x1a3D5055624707B689CA8130f72Abf41c461344B',value: web3.utils.toWei('1', 'ether'),data: web3.utils.toHex(234)
}web3.eth.sendTransaction(transactionObject).then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-CXEfFQOk-1643027019294)(C:\Users\Lenovo\AppData\Local\Temp\1643002813639.png)]
查询交易信息
web3.eth.getTransaction(transactionHash [, callback]) 返回具有指定哈希值的交易对象
- transactionHash - 交易哈希
web3.eth.getTransaction('0x11e1559508147c7ea2d3e9ce0dfb65be29d42d7a9077f9cef3e80ad64d38b3b8').then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-UdfIEp1a-1643027019296)(C:\Users\Lenovo\AppData\Local\Temp\1643003220495.png)]
查询交易收据
也就是进区块数据
web3.eth.getTransactionReceipt(hash [,callback]) 返回指定交易的收据对象，如果交易处于 pending 状态，则返回 null
- 查询已经被打包进区块链的信息
web3.eth.getTransactionReceipt('0x11e1559508147c7ea2d3e9ce0dfb65be29d42d7a9077f9cef3e80ad64d38b3b8').then(console.log)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-0sN8tmfB-1643027019296)(C:\Users\Lenovo\AppData\Local\Temp\1643003467342.png)]
与合约交互
ABI 简绍
相当于智能合约暴漏出来的标准接口
调用智能合约读函数
通常使用 call（）
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))var abi = [{"inputs": [],"name": "getNumber","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "uint256","name": "_number","type": "uint256"}],"name": "setNumber","outputs": [],"stateMutability": "nonpayable","type": "function"}
]var contractAddress = '0x4E4861f95f4cB129Dae9E739458f1583E1100Dd1'
var myContract = new web3.eth.Contract(abi, contractAddress)myContract.methods.getNumber().call(function(error, result) {console.log(result)
})
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-j3oocgFV-1643027019297)(C:\Users\Lenovo\AppData\Local\Temp\1643010370361.png)]
调用智能合约写函数
调用写函数，相当于发送了交易
myContract.methods.setNumber(1234).send({ from: '0x956188a6bD41694BdB13AA5CE168543a03B74770' }).on('receipt', function(receipt) {console.log(receipt)
})
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hYLM6qGP-1643027019297)(C:\Users\Lenovo\AppData\Local\Temp\1643011318716.png)]
执行事件查询
合约部分
pragma solidity >= 0.7.0 <0.9.0;contract DemoSimple {uint number;event myEvent(uint name);function setNumber(uint _number) public {emit myEvent(_number);number = _number;}function getNumber() public view returns(uint) {return number;}
}
js 部分
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))var abi = [{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "name","type": "uint256"}],"name": "myEvent","type": "event"},{"inputs": [],"name": "getNumber","outputs": [{"internalType": "uint256","name": "","type": "uint256"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "uint256","name": "_number","type": "uint256"}],"name": "setNumber","outputs": [],"stateMutability": "nonpayable","type": "function"}
]var contractAddress = '0x9af62672FA2a5f749Df1e3EdCE2A4825Adb73dF2'
var myContract = new web3.eth.Contract(abi, contractAddress)myContract.getPastEvents('AllEvents', {fromBlock: 0,toBlock: 'latest'},(error, result) => { console.log(result) }
)
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-gaFTqdJM-1643027019299)(C:\Users\Lenovo\AppData\Local\Temp\1643011858385.png)]
手工部署合约
let Web3 = require("web3")
let web3 = new Web3(new Web3.providers.HttpProvider("HTTP://127.0.0.1:8545"))var abi = [{"inputs": [{"internalType": "bytes32[]","name": "candidateNames","type": "bytes32[]"}],"stateMutability": "nonpayable","type": "constructor"},{"inputs": [{"internalType": "uint256","name": "","type": "uint256"}],"name": "candidateList","outputs": [{"internalType": "bytes32","name": "","type": "bytes32"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "bytes32","name": "candidate","type": "bytes32"}],"name": "totalVotesFor","outputs": [{"internalType": "uint8","name": "","type": "uint8"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "bytes32","name": "candidate","type": "bytes32"}],"name": "validCandidate","outputs": [{"internalType": "bool","name": "","type": "bool"}],"stateMutability": "view","type": "function"},{"inputs": [{"internalType": "bytes32","name": "candidate","type": "bytes32"}],"name": "voteForCandidate","outputs": [],"stateMutability": "nonpayable","type": "function"},{"inputs": [{"internalType": "bytes32","name": "","type": "bytes32"}],"name": "votesReceived","outputs": [{"internalType": "uint8","name": "","type": "uint8"}],"stateMutability": "view","type": "function"}
]var myContract = new web3.eth.Contract(abi)// deplay 的 字节码
var data = "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"var candidateNames = ['0x416c696365', '0x4265747479', '0x5365615361']
myContract.deploy({data: data,arguments: [candidateNames]
}).send({from: '0x88F3f579A8f1A84376884286Bd4A7927593834D7',gas: 1500000,gasPrice: '1000000'
}, function(error, result) {console.log(result)
})
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-mOlQXBWo-1643027019299)(C:\Users\Lenovo\AppData\Local\Temp\1643014387962.png)]
Web3js 小笔记相关推荐
- .NET小笔记之程序集
前面文章小笔记之--.NET Framework的内容 讲到了c#开发的程序在VS中可以编译成MSIL代码,那么这些代码保存在什么地方呢?答案就是程序集中.那么程序集又是以什么形式的文件存储呢?程序集 ...
- 一个PHP使用重新整理数组的小笔记
一个PHP使用重新整理数组的小笔记 今天写PHP的时候,因为写好的一个库接受的一个数组参数中,第一个元素不符合那个函数的要求,所以要unset掉.于是我unset(0);但是这个操作之后发现数组中的0 ...
- linux数据包注释,关于 linux中TCP数据包(SKB)序列号的小笔记
关于 SKB序列号的小笔记 为了修改TCP协议,现在遇到了要改动tcp分组的序列号,但是只是在tcp_sendmsg函数中找到了SKB的end_seq 一直没有找到seq 不清楚在那里初始化了,就 ...
- 【iOS开发每日小笔记（一）】UIPickerView 自动选择某个component的某个row
这篇文章是我的[iOS开发每日小笔记]系列中的一片,记录的是今天在开发工作中遇到的,可以用很短的文章或很小的demo演示解释出来的小心得小技巧.它们可能会给用户体验.代码效率得到一些提升,或是之前自己 ...
- 【iOS开发每日小笔记（二）】gitHub上的开源“瀑布流”使用心得
这篇文章是我的[iOS开发每日小笔记]系列中的一片,记录的是今天在开发工作中遇到的,可以用很短的文章或很小的demo演示解释出来的小心得小技巧.它们可能会给用户体验.代码效率得到一些提升,或是之前自己 ...
- Python小笔记——urllib2得到重定向最终链接
Python小笔记--urllib2得到重定向最终链接 强大的urllib2其实是有处理链接重定向的功能的,但是如何得到跳转最终的链接呢?其实相当简单,做个小笔记,也防止自己忘记了. 接下来用http ...
- 我的HEVC码流分析工具MFC小笔记：树形控件使用及窗口缩放
大约1个半月前,发布了自己写的HEVC码流分析工具.当时的版本显示语法元素使用是的Edit控件.很多主流分析工具都使用树形控件,看上去觉得比较高端,于是在纠结一天后下定决心自己也实现树形的HEVC语法 ...
- [小笔记]TypeScript/JavaScript模拟Python中的Range函数
[小笔记]TypeScript/JavaScript 模拟Python中的Range函数 李俊才/CSDN博客 CSDN用户名:jcLee95 邮箱:291148484@163.com 原创不易,感谢 ...
- [小笔记]TypeScript/JavaScript数组转置
[小笔记]TypeScript/JavaScript数组转置 CSDN:jcLee95 邮箱:291148484@163.com 在代数中,矩阵一个是一个方形数组,它由若干个长度相等的子数组构成.所谓 ...
- [小笔记]TypeScript/JavaScript映射两组数据
[小笔记]TypeScript/JavaScript映射两组数据 李俊才/CSDN博客 CSDN用户名:jcLee95 邮箱:291148484@163.com [需求]在Python3中有一个函数是 ...
最新文章
- centos搭建ftp环境
- 微软BI 之SSRS 系列 - 报表邮件订阅中 SMTP 服务器匿名访问与 Windows验证, 以及如何成功订阅报表的实例...
- 5.7 程序示例--基于 SMO 的 SVM 模型-机器学习笔记-斯坦福吴恩达教授
- 很好的一篇讲LTP在编解码中的作用的文章
- Scala入门到精通——第十节 Scala类层次结构、Traits初步
- js(Dom+Bom)第五天（1）
- JQuery 中选择多选择框，和单选框，实现获取相应选择的值
- java访问其它服务器,一个Java Web应用程序是否可以在tomcat服务器的同一本地主机中调用另一个Java Web应用程序...
- 简单的php探针,php探针程序的推荐
- eclipse中svn的各种状态图标详解
- 谷歌技术三宝之MapReduce（转）
- [译]时间自动机：语义，算法和工具
- 为什么c相电路在前面_第十二章 三相电路知识点
- RedisTemplate清空所有键值对
- NSString 转为gbk
- c语言系统函数——目录操作
- Android权限之sharedUserId和签名
- android在副屏中运行一个应用_android一个app打开另一个app的指定页面
- 电脑连接路由器后无法上网_路由器如何连接电脑 无线路由器与电脑连接步骤【图文】...
- Python中jieba库的使用