调用函数时无效的JSON响应

Question

我已经在wordpress网站中创建了一个web3js脚本，但是在执行下面的代码时，我会得到一个无效的JSON响应。

var Web3 = require("web3");
var web3 = new Web3();
web3.setProvider(new web3.providers.HttpProvider("https://ropsten.infura.io/xxxxxxxxxxx"));
var accounts = web3.eth.accounts;
var abi=[{"constant":false,"inputs":[{"name":"document","type":"string"},{"name":"timestamp","type":"uint256"}],"name":"notarize2","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"document","type":"string"}],"name":"checkDocument","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"proof","type":"bytes32"},{"name":"timestamp","type":"uint256"}],"name":"storeProof","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"source","type":"string"}],"name":"stringToBytes32","outputs":[{"name":"result","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"proof","type":"bytes32"}],"name":"hasProof","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}];
web3.eth.defaultAccount="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
var poe = web3.eth.contract(abi).at("YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY");
console.log(poe.address);
result="test";
var today = new Date();
var todayI = today.getFullYear()*10000+ (today.getMonth()+1)*100+today.getDate();
console.log(todayI);                     
poe.notarize2(result,todayI,{gas:2000000});

通过testrpc (localhost)和通过Remix / Metamask，我可以验证合同是否正确地部署在Ropsten上，并且运行良好。

有什么想法吗？这是我第一次尝试这个。

Answer 1

尝试将帐户设置为字符串地址。作为Smarx，公共节点作为infura不处理私有方法，如帐户。此外，在使用元问题时，请询问此帐户集以及web.accounts0

Answer 2

我不确定这是你唯一的问题，但你还没有指定一个帐户来进行这笔交易。恩弗拉，作为一个公共节点，不能持有任何人的私钥，因此它不知道任何帐户。

如果希望页面查看器进行事务处理，则需要使用类似于MetaMask的内容，而不是直接连接到节点。

如果你想用你自己的帐户进行交易，那就必须发生在服务器端，因为你不能让你的网站的观众访问你的私钥。

https://programtheblockchain.com/posts/2017/12/13/building-decentralized-apps-with-ethereum-and-javascript/可能会有所帮助，特别是“连接到节点”部分，它解释了MetaMask的角色。