本样例演示众筹合约的基本流程，包括部署合约，合约，启动众筹项目，
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配置私钥
在 .env 中放入的私钥，格式为 "PRIVATE_KEY=xxxx", 然后代码自动从中读取 -
安装依赖
yarn- 编译合约
npx hardhat compile- 测试合约
npx hardhat test- 部署合约
npx hardhat run scripts/deploy_crowdfunding.js --network rinkeby- CappedCrowdsale
- IndividuallyCappedCrowdsale
- TimedCrowdsale
- WhitelistedCrowdsale
- FinalizableCrowdsale
- PostDeliveryCrowdsale
- RefundableCrowdsale
- AllowanceCrowdsale
- MintedCrowdsale
- IncreasingPriceCrowdsale
- https://medium.com/openberry/creating-a-simple-crowdfunding-dapp-with-ethereum-solidity-and-vue-js-69ddb8e132dd
- https://medium.com/extropy-io/crowdsales-on-ethereum-with-openzeppelin-57bbdea95390
- https://www.programmersought.com/article/1396206575/
- https://github.com/OpenZeppelin/openzeppelin-contracts/tree/release-v2.3.0/contracts/crowdsale