Openzeppelin Crowdsale

Question

好的，所以我发现Openzeppelin是一种稍微容易使用的代码，它比Solidity解释得更好。但现在我的问题是数学题。我也不是数学家，我也无法理解它是如何工作的。因此，如果我想要一个例子中的每一个符号有3个以太，18小数，另一个则是8个小数，我如何将它输入到代码中，因为我现在所拥有的是不被接受的，我会得到数学位和构造函数部分的错误。请有人向我解释这一点，突出显示正确的库需要什么或输入，这样我就不会有任何错误。

我正在使用Metamsk Web.3，Remix，Solidity和Openzeppelin。

谢谢你们的帮助，我真的很感激你们的帮助。

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/crowdsale/Crowdsale.sol";
import  "@openzeppelin/contracts/crowdsale/CappedCrowdsale.sol";
import "@openzeppelin/contracts/crowdsale/CappedCrowdsale.sol";


/**
 * @title SimpleCrowdsale
 * @dev This is an example of a fully fledged crowdsale.
 *
contract SimpleCrowdsale is Crowdsale {
    constructor (
        uint256 rate, 10**18
        address payable wallet, 
        IERC20 token 
    )
        public
        Crowdsale(rate, wallet, token)
    {
    }

contract MyCrowdsale is Crowdsale, CappedCrowdsale, TimedCrowdsale {

    constructor(
        uint256 rate,  10**18          // rate, in bits
        address payable wallet,   // wallet to send Ether
        IERC20 token,            // the token
        uint256 cap,     66028410000000000000000000     // total cap, in wei
        uint256 openingTime,  Date(2020, 4, 02, 16, 30)  // opening time in unix epoch seconds
        uint256 closingTime    Date(2020, 4, 17, 16, 30) // closing time in unix epoch seconds
    )
        CappedCrowdsale(cap)
        TimedCrowdsale(openingTime, closingTime)
        Crowdsale(rate, wallet, token)
        public
    {
        // nice, we just created a crowdsale that's only open
        // for a certain amount of time
        // and stops accepting contributions once it reaches `cap`
    }
}

contract MyCrowdsale is Crowdsale, TimedCrowdsale, PostDeliveryCrowdsale {

    constructor(
        uint256 rate,    10**18        // rate, in bits
        address payable wallet,  // wallet to send Ether
        IERC20 token,            // the token
        uint256 openingTime,  Date(2020, 4, 02, 16, 30)   // opening time in unix epoch seconds
        uint256 closingTime   Date(2020, 4, 17, 16, 30)   // closing time in unix epoch seconds
    )
        PostDeliveryCrowdsale()
        TimedCrowdsale(openingTime, closingTime)
        Crowdsale(rate, wallet, token)
        public
    {
        // nice! this Crowdsale will keep all of the tokens until the end of the crowdsale
        // and then users can `withdrawTokens()` to get the tokens they're owed
    }
}

Answer 1

查看有关Crowdsale的文档，其中包括如何计算费率：https://docs.openzeppelin.com/contracts/2.x/crowdsales#crowdsale-rate

如果你对使用OpenZeppelin有疑问，你也可以在社区论坛上问：https://forum.openzeppelin.com/

披露:我是OpenZeppelin的社区经理