尝试运行:
1.) Dappuniversity 项目 (dappuniversity/dbank) 2.) 宠物店教程
Truffle v5.3.3(核心:5.3.3) 节点 v14.15.5
当Truffle要求编译器/solc匹配5.3.3时,ser如何编译代码@0.8.4导入OpenZeppelin的ERC20.sol模板?
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract Token is ERC20 {
//add minter variable
//add minter changed event
constructor() public payable ERC20("Name", "Symbol") {
//asign initial minter
}
//Add pass minter role function
function mint(address account, uint256 amount) public {
//check if msg.sender have minter role
_mint(account, amount);
}
}
找不到源“@openzeppelin/contracts/token/ERC20/ERC20.sol”:不支持文件导入回调
答案 0 :(得分:2)
错误:
Source "@openzeppelin/contracts/token/ERC20/ERC20.sol" not found: File import callback not supported
答案 1 :(得分:0)
ERC20 文件需要其他文件
export function getRotatedEllipseBounds(
x: number,
y: number,
rx: number,
ry: number,
rotation: number
) {
const c = Math.cos(rotation)
const s = Math.sin(rotation)
const w = Math.hypot(rx * c, ry * s)
const h = Math.hypot(rx * s, ry * c)
return {
minX: x + rx - w,
minY: y + ry - h,
maxX: x + rx + w,
maxY: y + ry + h,
width: w * 2,
height: h * 2,
}
}
不清楚您是否正确安装了 OpenZeppelin。