pragma solidity^0.4.24;
contract auction{
address public seller;//卖家
//最高出价者
address public buyer;
uint public auctionAmount;//最高价
uint auctionEndTime;//竞拍结束时间
bool isFinished;//shi fou wnacheng
//1卖家 2，时间间隔 构造函数
constructor(address _seller,uint _duration)public {
seller =_seller;
auctionEndTime =_duration +now;//jie'shu结束de结束的shi'jian结束的时间
isFinished =false;
}
//竞拍
function bid() public payable{
require(!isFinished);//是否结束
require(now<auctionEndTime);//还没有竞拍结束
require(msg.value>auctionAmount);//买家出价大于最高出价
if (auctionAmount>0&&address(0)!=buyer){
buyer.transfer(auctionAmount);//钱将退回给买家
}
buyer=msg.sender;//新的买家
auctionAmount=msg.value;//买家的最高价
}
//结束竞拍
function auctionEnd() public payable{
require(now>auctionEndTime);//过了竞拍时间
require(!isFinished);
isFinished=true;
seller.transfer(auctionAmount);//将钱转回到卖家钱包
}
//获取出价最高买家的价钱
function getBalance() public view returns(uint){
return address(this).balance;
}
}
