以太坊现在发币很贵，天价手续费，今天我刚刚帮别人发了一个需要250美金的手续费，我真为顾客心疼，但是没办法，人家有需求，GWEI现在稳定都是100多，对应就是200多美金的手续费，天下苦以太坊久以，更可笑的是转账也有差不多100的手续费。
闲话不多说，我们来讲解一下ERC20怎么发币的吧。不会的，我可以帮你。
https://remix.ethereum.org/首先用到是这个，
合约代码是这个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 = 8;
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 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;
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;
}
}
把合约代码复制进去，就可以部署了，
Compile and Deploy ERC20 Contract
Open Remix IDE: https://remix.ethereum.org
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Select solidity language
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Create new contract ERC20Token.sol and copy contract code from the bep20 token template here
Modify “name”, “symbol”, “decimals” and “totalSupply” according to your requirements.
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Compile the ERC20 token contract
a. Step1: Click button to switch to compile page
b. Step2: Select “ERC20Token” contract
c. Step3: Enable “Auto compile” and “optimization”
d. Step4: Click “ABI” to copy the contract abi and save it.
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Depoy the contract to ETH
a. Step1: Click button to switch to compile button.
b. Step2: Select “Injected Web3”
c. Step3: Select “ERC20Token”
d. Step4: Client “Deploy” button and Metamask will pop up
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e. Client “confirm” button to sign and broadcast transaction to ETH.
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至此，发币结束，大家学会了吗？
