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什么是ERC20
可以把ERC20简单理解成以太坊上的一个代币协议，所有基于以太坊开发的代币合约都遵守这个协议。遵守这些协议的代币我们可以认为是标准化的代币，而标准化带来的好处是兼容性好。这些标准化的代币可以被各种以太坊钱包支持，用于不同的平台和项目。说白了，你要是想在以太坊上发行代币融资，必须要遵守ERC20标准。
ERC20的标准接口是这样的:
contract ERC20 {
function name() constant returns (string name)
function symbol() constant returns (string symbol)
function decimals() constant returns (uint8 decimals)
function totalSupply() constant returns (uint totalSupply);
function balanceOf(address _owner) constant returns (uint balance);
function transfer(address _to, uint _value) returns (bool success);
function transferFrom(address _from, address _to, uint _value) returns (bool success);
function approve(address _spender, uint _value) returns (bool success);
function allowance(address _owner, address _spender) constant returns (uint remaining);
event Transfer(address indexed _from, address indexed _to, uint _value);
event Approval(address indexed _owner, address indexed _spender, uint _value);
}