手把手教你在HECO主链上学习智能合约-HECO

科技前沿 • 2025-03-14 09:26 • 阅读 94

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4、转入一个ETH
二、发布合约
进入到这个网站进行

在此是需要已经安装Chrome插件的

1、合约模版

pragma solidity ^0.4.16;   interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }   contract TokenERC20 {     string public name;     string public symbol;     uint8 public decimals = 18;  // 18 是建议的默认值     uint256 public totalSupply;       mapping (address => uint256) public balanceOf;  //     mapping (address => mapping (address => uint256)) public allowance;       event Transfer(address indexed from, address indexed to, uint256 value);     event Approval(address indexed owner, address indexed spender, uint256 value);     event Burn(address indexed from, uint256 value);         function TokenERC20(uint256 initialSupply, string tokenName, string tokenSymbol) public {         totalSupply = initialSupply * 10 uint256(decimals);         balanceOf[msg.sender] = totalSupply;         name = tokenName;         symbol = tokenSymbol;     }         function _transfer(address _from, address _to, uint _value) internal {         require(_to != 0x0);         require(balanceOf[_from] >= _value);         require(balanceOf[_to] + _value > balanceOf[_to]);         uint previousBalances = balanceOf[_from] + balanceOf[_to];         balanceOf[_from] -= _value;         balanceOf[_to] += _value;         Transfer(_from, _to, _value);         assert(balanceOf[_from] + balanceOf[_to] == previousBalances);     }       function transfer(address _to, uint256 _value) public returns (bool) {         _transfer(msg.sender, _to, _value);         return true;     }       function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {         require(_value <= allowance[_from][msg.sender]);     // Check allowance         allowance[_from][msg.sender] -= _value;         _transfer(_from, _to, _value);         return true;     }       function approve(address _spender, uint256 _value) public         returns (bool success) {         allowance[msg.sender][_spender] = _value;         Approval(msg.sender, _spender, _value);         return true;     }       function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {         tokenRecipient spender = tokenRecipient(_spender);         if (approve(_spender, _value)) {             spender.receiveApproval(msg.sender, _value, this, _extraData);             return true;         }     }       function burn(uint256 _value) public returns (bool success) {         require(balanceOf[msg.sender] >= _value);         balanceOf[msg.sender] -= _value;         totalSupply -= _value;         Burn(msg.sender, _value);         return true;     }       function burnFrom(address _from, uint256 _value) public returns (bool success) {         require(balanceOf[_from] >= _value);         require(_value <= allowance[_from][msg.sender]);         balanceOf[_from] -= _value;         allowance[_from][msg.sender] -= _value;         totalSupply -= _value;         Burn(_from, _value);         return true;     } }

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