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pragma solidity ^0.4.8;
contract ERC20 {
    // token总量，默认会为public变量生成一个getter函数接口，名称为totalSupply().
    uint256 public totalSupply;
    /// 获取账户_owner拥有token的数量 
    function balanceOf(address _owner) constant returns (uint256 balance);
    //从消息发送者账户中往_to账户转数量为_value的token
    function transfer(address _to, uint256 _value) returns (bool success);
    //从账户_from中往账户_to转数量为_value的token，与approve方法配合使用
    function transferFrom(address _from, address _to, uint256 _value) returns   
    (bool success);
    //消息发送账户设置账户_spender能从发送账户中转出数量为_value的token
    function approve(address _spender, uint256 _value) returns (bool success);
    //获取账户_spender可以从账户_owner中转出token的数量
    function allowance(address _owner, address _spender) constant returns 
    (uint256 remaining);
    //发生转账时必须要触发的事件 
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    //当函数approve(address _spender, uint256 _value)成功执行时必须触发的事件
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