npm的web3

1.获取账户地址

var localhost = "http://127.0.0.1:8545"
var Web3 = require("web3")
var web3 = new Web3(new Web3.providers.HttpProvider(localhost))
web3.eth.getAccounts(function (error, result) {
    console.log("账户列表地址：");
    console.log(result);
});

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部署合约测试

var localhost = "http://127.0.0.1:8545"
var Web3 = require("web3")
var web3 = new Web3(new Web3.providers.HttpProvider(localhost))

async function getAccount(){
    return new Promise((resolve,reject)=>{
        web3.eth.getAccounts((err,result)=>{
            if(err){reject(err);return}
            resolve(result)
        })
    })
}

async function readContractFile(fileName){
    return new Promise((resolve, reject) => {
       let filePath =   path.resolve(__dirname,fileName)
       fs.readFile(filePath,'utf8',(err,res)=>{
            if(err){reject(err);return}
            resolve(res)
       })
    })
}

async function deploy(AbiInfo,ByteCode,arguments,account,gas,){
   var currentContract = new web3.eth.Contract(JSON.parse(AbiInfo))
   currentContract.deploy({
    data:JSON.parse(ByteCode).object,
    arguments:arguments
   }).send({
        from:account,
        gas:gas
   },function(e,contract){
        console.log(e, contract);
        if (typeof contract.address !== 'undefined') {
            console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
       }
   })
}
//部署测试
async function deployContract(){
    let account = (await getAccount())[0]
    let AbiInfo = await readContractFile("file/ABI.json")
    let ByteCode = await readContractFile("file/ByteCode.json")
    await deploy(AbiInfo,ByteCode,[],account,'4700000')

}
deployContract()

和合约交互

合约部署完后得到合约地址，把地址放在web3.eth.Contract​里

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