区块链项目dapp开发/源码部署 看铭籽
合约的代码需要具体的环境和编程语言,例如以太坊上的Solidity语言。以下是一个基于以太坊的ERC20标准代币合约的简化示例:
```solidity
pragma solidity ^0.8.0;
contract MyToken {
uint256 public totalSupply;
mapping(address => uint256) public balances;
function transfer(address _to, uint256 _value) public returns (bool success) {
require(balances[msg.sender] >= _value, "Insufficient balance");
require(_to != address(0), "Only valid to transfer to a non-zero address");
balances[msg.sender] -= _value;
balances[_to] = _value;
totalSupply = _value;
return true;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function totalSupply() public view returns (uint256 supply) {
return totalSupply;
}
}
```
在这个合约中,我们定义了几个变量:totalSupply(总供应量),balances(地址与数量映射),transfer(转移代币的函数),balanceOf(查看特定地址的代币余额),和totalSupply(查看总供应量)。
这个合约在以太坊上部署后,任何人都可以通过调用transfer函数来转移代币,这个函数会检查用户的