内容简介：在之前的课程中，我们介绍了如何编译与部署合约。现在，我们假设已经把合约部署到了ropsten的网络之上。得到了地址。现在，我们需要通过合约的ABI接口与地址来构建博彩合约的实例。新建文件：src/lottery.js:
博彩实例
在之前的课程中，我们介绍了如何编译与部署合约。现在，我们假设已经把合约部署到了ropsten的网络之上。得到了地址。
现在，我们需要通过合约的ABI接口与地址来构建博彩合约的实例。
新建文件：src/lottery.js:
import web3 from './web3';
const address = '0x94A261B507c4388f2ADcFfaA5685ffdF53ebcba5';
const abi = [{"constant":true,"inputs":[],"name":"manager","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"getPlayers","outputs":[{"name":"","type":"address[]"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"enetr","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[],"name":"pickwiner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"players","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"}];
export default new web3.eth.Contract(abi,address);
src/App.js:
componentDidMount为react class的生命周期函数，其在reander之后执行。state是react中特殊的属性，其只是存在于class component中，用于存储属性。
当state中的状态变化之后，都会重新的执行reander函数，从而让页面展现出不同的效果。下面获取了管理者的地址并存储在了state状态变量中。在页面中显示了管理者的地址。
import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import web3 from './web3';
import lottery from './lottery';
class App extends Component {
state = {
manager:'',
}
async componentDidMount(){
const manager = await lottery.methods.manager().call();
this.setState({manager});
}
render() {
return (
<div>
<h1>lottery管理者地址：</h1>
<p>this is manager by {this.state.manager}</p>
</div>
);
}
}
export default App;
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