“stateMutability”: “nonpayable”,
console.log(‘address__________’, contractInstance.options.address)
}
console.log(‘web3-eth.curretProvider_____________’, web3.currentProvider)
//1.拼接合约数据
“payable”: false,
//引入包
let HDWalletProvider = require(‘truffle-hdwallet-provider’)
let web3 = new Web3()
git地点 https://github.com/potaxie/web3 •专业一点讲，Infura是一种IaaS（Infrastructure as a Service）产物，目标是为了低落会见数据的门槛。 操纵步调 什么是Infura
arguments: [‘helloworld’]//给结构函数通报参数，利用数组
需要填写的数据
}]
•指定一个处事商，让他辅佐我们毗连到真实网络 https://ropsten.infura.io/v3/4c25a49808354c5480f97d4c82117ee4
//3.配置metamask Ropsten-network的助记着词，，表白花谁的钱
•通俗一点讲，Infura就是一个可以让你的dApp快速接入以太坊的平台，不需要当地运行以太坊节点。
//3.配置测试网络 infura
let web3 = new Web3()
try {
}
//web3和交互的返回值都是promise，可以直接利用async
let contract = new web3.eth.Contract(JSON.parse(interface))
console.log(‘accounts____’, accounts)
gasPrice: ‘1’,
“type”: “function”
let terms = ‘truly state fruit rug decide riot shy lake apple orphan october dinosaur’
let HDWalletProvider = require(‘truffle-hdwallet-provider’)
//2.new一个web3实例
//2.new一个web3实例
web3.setProvider(provider)
let netIp = ‘https://ropsten.infura.io/v3/4c25a49808354c5480f97d4c82117ee4’
•助记词，暗示花谁的钱–metamask 测试网络 scout same naive genius cannon maze differ acquire penalty habit surround ice
let HDWalletProvider = require(‘truffle-hdwallet-provider’)
//3.配置测试网络 infura
data: bytecode,//合约的bytecode
“inputs”: [],
test()
//引入包
let {bytecode, interface} = require(‘./01-compile’)
let provider = new HDWalletProvider(terms, netIp)
“constant”: true,
//执行陈设
“outputs”: [{“name”: “”, “type”: “string”}],
•建设一个prodivier
//获取所有的账户
“type”: “function”
•安装truffle-hdwallet-provider
代码修改
let accounts = await web3.eth.getAccounts()
03-instance
功效展示
web3.setProvider(provider)
console.log(‘v2:’, v2)
[1] [email protected]: mailto:[email protected]
let address = ‘0x797Ff2e41b64eD1adfc84cA98afeD00813Dd051D’ //此处是合约地点
let netIp = ‘https://ropsten.infura.io/v3/4c25a49808354c5480f97d4c82117ee4’
//3.配置metamask Ropsten-network的助记着词，表白花谁的钱
let contractInstance = new web3.eth.Contract(abi, address)
deploy()
//3.配置测试网络 infura
“inputs”: [{“name”: “_str”, “type”: “string”}],
//1.引入web3
04-interaction
“inputs”: [{“name”: “_str”, “type”: “string”}],
console.log(‘version:________’, web3.version)
}).send({
//2.new一个web3实例
let provider = new HDWalletProvider(terms, netIp)
let abi = [{
•导入包
console.log(‘res:’, res)
from: accounts[0],
module.exports = contractInstance
let terms = ‘truly state fruit rug decide riot shy lake apple orphan october dinosaur’
web3.setProvider(provider)
let accounts = await web3.eth.getAccounts()
let provider = new HDWalletProvider(terms, netIp)
02-deploy
“outputs”: [],
•从措施员的角度讲，Infura就是一个Web3 Provider，背后是负载平衡的API节点集群。利用它的长处就是，你永远不必担忧毗连的节点失效的问题，Infura会打点好这一切。
value: 0,
let res = await instance.methods.setValue(‘Hello HangTou’).send({
let Web3 = require(‘web3’)
let Web3 =require(‘web3’)
let Web3 =require(‘web3’)
let web3 = new Web3()
let y1 = await instance.methods.getValue().call()
“stateMutability”: “nonpayable”,
let netIp = ‘https://ropsten.infura.io/v3/4c25a49808354c5480f97d4c82117ee4’
gas:’3000000′,
}, {
console.log(e)
“name”: “getValue”,
})
“constant”: false,
} catch (e) {
let test = async () => {
//引入包
})
let terms = ‘truly state fruit rug decide riot shy lake apple orphan october dinosaur’
gas: ‘3000000’,
}, {
“payable”: false,
let Web3 =require(‘web3’)
web3.setProvider(provider)
//3.配置metamask Ropsten-network的助记着词，表白花谁的钱
let deploy = async () => {
//获取当前区块链的对应助记词的账户地点
“name”: “setValue”,
let instance = await contract.deploy({
References
let provider = new HDWalletProvider(terms, netIp)
//整体封装成函数
“stateMutability”: “view”,
“type”: “constructor”
}
let v2 = await instance.methods.getValue().call()
//2.new一个web3实例
•需要利用个npm包（接管两个参数：1，2，这个包会帮我们毗连到对应网络） npm install [email protected][1] –save
let terms = ‘truly state fruit rug decide riot shy lake apple orphan october dinosaur’
from: from,
let from = accounts[0]
“payable”: false,
//3.配置测试网络 infura
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