如何从Nodejs文件调用Web3js函数

我有以下工作web3js代码，调用button上的App.createContract（）单击在网页上很好，但我想调用App.createContract（）或从另一个Nodejs控制器类似。 事实上，我在想的是在Node中创build一个API，它可以调用web3js函数并返回一个JSON结果给调用者。 你能帮我如何导入我的web3js文件，并从节点控制器调用function？ 谢谢

import "../stylesheets/app.css"; import { default as Web3} from 'web3'; import { default as contract } from 'truffle-contract'; import { default as CryptoJS} from 'crypto-js'; var accounts; var account; var shLogABI; var shLogContract; var shLogCode; var shLogSource; window.App = { start: function() { var self = this; web3.eth.getAccounts(function(err, accs) { if (err != null) { alert("There was an error fetching your accounts."); return; } if (accs.length == 0) { alert("Couldn't get any accounts! Make sure your Ethereum client is configured correctly."); return; } accounts = accs; console.log(accounts); account = accounts[0]; web3.eth.defaultAccount= account; shLogSource= "pragma solidity ^0.4.6; contract SHLog { struct LogData{ string FileName; uint UploadTimeStamp; string AttestationDate; } mapping(uint => LogData) Trail; uint8 TrailCount=0; function AddNewLog(string FileName, uint UploadTimeStamp, string AttestationDate) { LogData memory newLog; newLog.FileName = FileName; newLog.UploadTimeStamp= UploadTimeStamp; newLog.AttestationDate= AttestationDate; Trail[TrailCount] = newLog; TrailCount++; } function GetTrailCount() returns(uint8){ return TrailCount; } function GetLog(uint8 TrailNo) returns (string,uint,string) { return (Trail[TrailNo].FileName, Trail[TrailNo].UploadTimeStamp, Trail[TrailNo].AttestationDate); } }"; web3.eth.compile.solidity(shLogSource, function(error, shLogCompiled){ shLogABI = JSON.parse(' [ { "constant": false, "inputs": [ { "name": "TrailNo", "type": "uint8" } ], "name": "GetLog", "outputs": [ { "name": "", "type": "string" }, { "name": "", "type": "uint256" }, { "name": "", "type": "string" } ], "payable": false, "type": "function" }, { "constant": false, "inputs": [ { "name": "FileName", "type": "string" }, { "name": "UploadTimeStamp", "type": "uint256" }, { "name": "AttestationDate", "type": "string" } ], "name": "AddNewLog", "outputs": [], "payable": false, "type": "function" }, { "constant": false, "inputs": [], "name": "GetTrailCount", "outputs": [ { "name": "", "type": "uint8" } ], "payable": false, "type": "function" } ]'); shLogContract = web3.eth.contract(shLogABI); }); }); }, createContract: function() { shLogContract.new("", {from:account, gas: 3000000}, function (error, deployedContract){ if(deployedContract.address) { document.getElementById("contractAddress").value=deployedContract.address; document.getElementById("fileName").value = ''; document.getElementById("uploadTimeStamp").value = ''; document.getElementById("attestationDate").value = ''; } }) }, addNewLog: function() { var contractAddress = document.getElementById("contractAddress").value; var deployedshLog = shLogContract.at(contractAddress); var fileName = document.getElementById("fileName").value; var uploadTimeStamp = document.getElementById("uploadTimeStamp").value; var attestationDate = document.getElementById("attestationDate").value; deployedshLog.AddNewLog(fileName, uploadTimeStamp, attestationDate, function(error){ console.log(error); }) }, getLog: function() { try{ var contractAddress = document.getElementById("contractAddress").value; var deployedshLog = shLogContract.at(contractAddress); deployedshLog.GetTrailCount.call(function (error, trailCount){ deployedshLog.GetLog.call(trailCount-1, function(error, returnValues){ document.getElementById("fileName").value= returnValues[0]; document.getElementById("uploadTimeStamp").value = returnValues[1]; document.getElementById("attestationDate").value=returnValues[2]; }) }) } catch (error) { document.getElementById("fileName").value= error.message; document.getElementById("uploadTimeStamp").value = error.message; document.getElementById("attestationDate").value= error.message; } } }; window.addEventListener('load', function() { if (typeof web3 !== 'undefined') { console.warn("Using web3 detected from external source. If using MetaMask, see the following link. Feel free to delete this warning. :) http://truffleframework.com/tutorials/truffle-and-metamask") window.web3 = new Web3(web3.currentProvider); } else { console.warn("No web3 detected. Falling back to http://localhost:8545. You should remove this fallback when you deploy live, as it's inherently insecure. Consider switching to Metamask for development. More info here: http://truffleframework.com/tutorials/truffle-and-metamask"); // fallback - use your fallback strategy (local node / hosted node + in-dapp id mgmt / fail) window.web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545")); } App.start(); });