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pragma solidity ^0.4.21;
contract EIP20Interface {
    // 获取总的支持量
    uint256 public totalSupply;
    // 获取其他地址的余额
    function balanceOf(address _owner) public view returns (uint256 balance);
    // 调用者向_to地址发送_value数量的token
    function transfer(address _to, uint256 _value) public returns (bool success);
    //从_from地址向_to地址发送_value数量的token
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    //允许_spender从自己的账户转出_value数量的token，调用多次会覆盖可用量。
    function approve(address _spender, uint256 _value) public returns (bool success);
    // 返回_spender仍然允许从_owner获取的余额数量
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);
    // token转移完成后触发
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    // approve调用后触发
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract MyToken is EIP20Interface {
    //注意以下四个状态变量必须公开，并且变量名不能变化，如decimals，命名为decimal。否则与其它钱包应用不能兼容。
    uint256 public totalSupply;
    uint8 public decimals;
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