Question

我正在web3.js库的帮助下与部署在本地以太坊节点上的智能合约进行交互。不幸的是，web3.eth.Contract(abi, address)似乎未能启动合同实例。

【摘要】整个app.js文件如下所示：

const Web3 = require('web3');
const web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

const abi = [{"anonymous": false,"inputs": [{"indexed": false,"name": "add","type": "int256"},{"indexed": false,"name": "name","type": "string"},{"indexed": true,"name": "id","type": "uint256"},{"indexed": true,"name": "checked","type": "bool"}],"name": "globalValueChanged","type": "event"},{"constant": false,"inputs": [{"name": "add","type": "int256"},{"name": "name","type": "string"},{"name": "id","type": "uint256"},{"name": "checked","type": "bool"}],"name": "modifyGlobalValue","outputs": [{"name": "","type": "int256"}],"payable": false,"stateMutability": "nonpayable","type": "function"},{"inputs": [],"payable": false,"stateMutability": "nonpayable","type": "constructor"},{"constant": true,"inputs": [],"name": "getGlobalValue","outputs": [{"name": "","type": "int256"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": true,"inputs": [{"name": "times","type": "int256"}],"name": "testGlobalValue","outputs": [{"name": "","type": "int256"}],"payable": false,"stateMutability": "view","type": "function"}]
const address = '0x9f6c4e63cbca51dea852a579c907317a0eac138c';
const contractInstance = new web3.eth.Contract(abi, address);

// to test if initialized web3 works fine
web3.eth.getAccounts().then((results) => {
    console.log("***web3.eth.getAccounts()***:")
    console.log(results)
})

// to test if web3.eth.Contract works
console.log("***contractInstance.abi***:")
console.log(contractInstance.abi)

【输出】正在运行的node app.js的输出。

**contractInstance.abi***:
undefined
***web3.eth.getAccounts()***:
[ '0x135B02baD443C1073C14F8a7f13cEc8661d3eC3d',
  '0x69890d19B6eb060cA47e1ca41d93256E46bb7195' ]

web3.eth.getAccounts()返回正确的值，而web3.eth.Contract(abi, address)似乎无法启动合同实例。

【附加信息】

npm list web输出web3@1.0.0-beta.52。
其他诸如web3.eth.getAccounts（）之类的web3功能也可以正常工作。
在geth控制台中，使用abi和address相同的值，eth.contract(abi).at(address)可以正常工作。

web3.js：函数web3.eth.Contract（abi，address）无法启动合同实例

0 个答案: