-Contract-Source-Code

Contract Source Code pragma solidity ^0.4.8; contract Token{ // 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
event Approval(address indexed _owner, address indexed _spender, uint256 
_value);

}

contract StandardToken is Token { function transfer(address _to, uint256 _value) returns (bool success) { //默认totalSupply 不会超过最大值 (2^256 - 1). //如果随着时间的推移将会有新的token生成，则可以用下面这句避免溢出的异常 //require(balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]); require(balances[msg.sender] >= _value); balances[msg.sender] -= _value;//从消息发送者账户中减去token数量_value balances[_to] += _value;//往接收账户增加token数量_value Transfer(msg.sender, _to, _value);//触发转币交易事件 return true; }

function transferFrom(address _from, address _to, uint256 _value) returns 
(bool success) {
    //require(balances[_from] >= _value && allowed[_from][msg.sender] >= 
    // _value && balances[_to] + _value > balances[_to]);
    require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value);
    balances[_to] += _value;//接收账户增加token数量_value
    balances[_from] -= _value; //支出账户_from减去token数量_value
    allowed[_from][msg.sender] -= _value;//消息发送者可以从账户_from中转出的数量减少_value
    Transfer(_from, _to, _value);//触发转币交易事件
    return true;
}
function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
}


function approve(address _spender, uint256 _value) returns (bool success)   
{
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
}


function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];//允许_spender从_owner中转出的token数
}
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;

}

contract WIT is StandardToken {

/* Public variables of the token */
string public name;                   //名称: eg Simon Bucks
uint8 public decimals;               //最多的小数位数，How many decimals to show. ie. There could 1000 base units with 3 decimals. Meaning 0.980 SBX = 980 base units. It's like comparing 1 wei to 1 ether.
string public symbol;               //token简称: eg SBX
string public version = 'H0.1';    //版本

function WIT(uint256 _initialAmount, string _tokenName, uint8 _decimalUnits, string _tokenSymbol) {
    balances[msg.sender] = _initialAmount; // 初始token数量给予消息发送者
    totalSupply = _initialAmount;         // 设置初始总量
    name = _tokenName;                   // token名称
    decimals = _decimalUnits;           // 小数位数
    symbol = _tokenSymbol;             // token简称
}

/* Approves and then calls the receiving contract */

function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
    //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
    //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
    require(_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData));
    return true;
}

}