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合约示例 pragma solidity ^0.4.18; contract CallMeChallenge { bool public isComplete = false; function callme() public { isComplete = true; } }

可以用solc编译合约，也可以用Remix编译。

如果用solc编译的话，需要下载同合约使用的solidity版本相同的solc版本。

npm install [email protected]

Remix编译后直接复制bytecode到代码里即可。

web3.js部署合约

环境：nodejs

npm install [email protected]^0.20.1 npm install [email protected]^1.3.7 var Web3 = require('web3'); var Tx = require('ethereumjs-tx'); var solc = require('solc'); var fs = require('fs'); //init if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); } else { web3 = new Web3(new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/1b8...b0")); } var fromAddr = '0x97...5B7'; var count = web3.eth.getTransactionCount(fromAddr); var gasPrice = web3.eth.gasPrice; var gasLimit = 3000000; var privateKey = new Buffer.from('bb07...ed3c', 'hex'); //编译合约，获得bytecode var source = fs.readFileSync("./test.sol", "utf8"); var compilied = solc.compile(source, 1); var bytecode = compilied.contracts[':CallMeChallenge'].bytecode; //要打包的交易信息 var rawTx = { 'from': fromAddr, 'nonce': web3.toHex(count), 'gasPrice': web3.toHex(gasPrice), 'gasLimit': web3.toHex(gasLimit), 'value': '0x0', 'data': '0x'+bytecode }; var tx = new Tx(rawTx); tx.sign(privateKey); var serializedTx = tx.serialize(); var hashTx = web3.eth.sendRawTransaction('0x'+serializedTx.toString('hex')); console.log('txHash: ' + hashTx); var makeTx; while (true) { makeTx = web3.eth.getTransaction(hashTx); if (makeTx["blockNumber"] !== null) { var receipt = web3.eth.getTransactionReceipt(hashTx); console.log("address: " + receipt["contractAddress"]); break; } }

在运行同一个脚本的时候遇到玄学问题，Error: Invalid JSON RPC response: undefined报出这个错误，找了很久才发现是网络问题，加载infura有时候需要挂个代理来访问，如果你也遇到这个问题，就挂个代理跑跑。

web3.py部署合约

环境：python3.6

# -*- coding:utf-8 -*- from web3 import Web3, HTTPProvider true = True false = False web3 = Web3(HTTPProvider('https://ropsten.infura.io/v3/1b...b0')) fromAddr = '0x97D7...5B7' privateKey = '0xbb...ed3c' nonce = web3.eth.getTransactionCount(fromAddr) gasPrice = web3.eth.gasPrice rawTx = { 'from': fromAddr, 'nonce': nonce, 'gasPrice': gasPrice, 'gas': 300000, 'value': web3.toWei(0, 'ether'), 'data': '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' } def deploy(rawTx): signedTx = web3.eth.account.signTransaction(rawTx, private_key=privateKey) hashTx = web3.eth.sendRawTransaction(signedTx.rawTransaction).hex() receipt = web3.eth.waitForTransactionReceipt(hashTx) return receipt if __name__ == '__main__': receipt = deploy(rawTx) print('address: ' + receipt['contractAddress']) 后话

这里用JavaScript和Python两个web3版本来实现自动部署合约，免去了在Remix上手动部署，，另外还有Java版的web3等等。

如何用web3部署智能合约

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原文地址：https://www.cnblogs.com/KRDecad3/p/11914985.html