var Web3 = require('web3');
var web3 = new Web3('http://localhost:8545');
			
			

查看连接状态

			
> web3.currentProvider
HttpProvider {
  host: 'http://localhost:8545',
  timeout: 0,
  connected: true,
  headers: undefined }			
			
			

connected: true 表示连接成功。

			
var Web3 = require('web3');
var web3 = new Web3(Web3.givenProvider || 'ws://remotenode.com:8546');
			
			

			
// Using the IPC provider in node.js
var net = require('net');
var Web3 = require('web3');
var web3 = new Web3('/Users/myuser/Library/Ethereum/geth.ipc', net); // mac os path