使用web3.eth.getAccounts()获取网络中的所有帐户,但出现此错误:
(节点:31916)UnhandledPromiseRejectionWarning:错误:未向提供程序的send函数提供回调。从web3 1.0开始,provider.send不再同步,必须将回调传递为其最终参数。
我正在使用ganache-cli作为测试网络,坚固性为0.5.0。我更喜欢使用强度0.5.0。
这是Inbox.test.js文件
const assert = require('assert'); //lowercase
const ganache = require('ganache-cli');
const Web3 = require('web3'); // uppercase W cause its a constructor used to create instances of web3 library.
const web3 = new Web3(ganache.provider()); // web3 is an instance which is connected to ganache local test network.
//let accounts;
beforeEach( () => {
web3.eth.getAccounts().then((fetchedAccounts) =>{
console.log(fetchedAccounts);
});
})
describe('Inbox', () => {
it('deploys a contract', () => {
// console.log(accounts);
});
});
Package.json
{
"name": "inbox",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "mocha"
},
"author": "Maryam",
"license": "ISC",
"dependencies": {
"ganache-cli": "^6.2.3",
"mocha": "^5.2.0",
"solc": "^0.5.0",
"web3": "^1.0.0-beta.37"
}
}
答案 0 :(得分:0)
您必须首先安装ganache-cli globaly
npm install -g ganache-cli
然后您从命令行启动ganache-cli以启动testNet
ganache-cli
这将生成一个链接,运行ganache-cli后,您将看到该链接
Listening on 127.0.0.1:8545
现在您必须从
更改web3.js声明 const web3 = new Web3(ganache.provider()); // web3 is an instance which is connected to ganache local test network.
对此:
var web3 = new Web3("http://127.0.0.1:8545");