节点分类

• light client --- 轻节点
• full client --- 全节点

推荐使用：
MetaMask（小狐狸） https://metamask.io/

• 可以选择不同的网络
• 转账功能
• 交易功能

注意输入的密码为你所设定的密码

初始化web3，选择加载注入插件或者本地testrpc服务

src/utils/getWeb3.js

import Web3 from 'web3'

let getWeb3 = new Promise(function(resolve, reject) {
  // Wait for loading completion to avoid race conditions with web3 injection timing.
  window.addEventListener('load', function() {
    var results
    var web3 = window.web3

    // Checking if Web3 has been injected by the browser (Mist/MetaMask)
    if (typeof web3 !== 'undefined') {
      // Use Mist/MetaMask's provider.
      web3 = new Web3(web3.currentProvider)

      results = {
        web3: web3
      }

      console.log('Injected web3 detected.');

      resolve(results)
    } else {
      // Fallback to localhost if no web3 injection.
      var provider = new Web3.providers.HttpProvider('http://localhost:8545')

      web3 = new Web3(provider)

      results = {
        web3: web3
      }

      console.log('No web3 instance injected, using Local web3.');

      resolve(results)
    }
  })
})

export default getWeb3

添加event 可以增加前端的使用