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 是建議的默認(rèn)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 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 {_transfer(msg.sender, _to, _value);}function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {require(_value <= allowance[_from][msg.sender]); // Check allowanceallowance[_from][msg.sender] -= _value;_transfer(_from, _to, _value);return true;}function approve(address _spender, uint256 _value) publicreturns (bool success) {allowance[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;} } 復(fù)制代碼

轉(zhuǎn)載于:https://juejin.im/post/5ba9f5e2e51d450e704283f3

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