Web3.js教程:
web3.js - 以太坊 JavaScript API — web3.js 中文文档 — 登链社区https://learnblockchain.cn/docs/web3.js/index.html
初始化
cd web3jTest
npm init
下载web3到项目中
npm install web3 --save
交互代码示例:
var Web3 = require('web3');
var provider = new Web3.providers.HttpProvider("http://localhost:7545");
var json = require("./contracts/MetaCoin.json");
var address = '0x9C334Fb3287dA1E6cc063B084c5432985a708999';
var web3 = new Web3(provider);
var metacoin = new web3.eth.Contract(json['abi'],address);
// var Web3EthContract = require('web3-eth-contract');
// Web3EthContract.setProvider(provider);
// var metacoin = new Web3EthContract(json['abi'],address);
var account_one = "0x060f4e095Eeb77ad987412578652a5201436E3c3";
metacoin.methods.getBalance(account_one).call({from: account_one}, function(error, result){
console.log(error);
console.log(result);
});
测试执行
node test.js
执行结果:
null
9500