Web3.js1.0与智能合约交互

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