泰山众筹avatar阿凡达系统开发(开发逻辑)及源码部署

Blockchain technology can thus empower enterprises in many ways:providing reliable shared data and building trust between all parties;Eliminate data islands,that is,integrate data into a system through centralized ledgers that are shared in a network and support the access of licensees;Give high security to data; interface IWETH{ function deposit()external payable; function transfer(address to,uint value)external returns(bool); function withdraw(uint)external; } contract UniswapV2Router02 is IUniswapV2Router02{ using SafeMath for uint; address public immutable override factory; address public immutable override WETH; //交易时间是否过期，dapp中默认设置时20分钟内成交有效 modifier ensure(uint deadline){ require(deadline>=block.timestamp,'UniswapV2Router:EXPIRED'); _; }逻辑及模式：I35流程7O98开发O7I8 constructor(address _factory,address _WETH)public{ factory=_factory; WETH=_WETH; } receive()external payable{ assert(msg.sender==WETH);//only accept ETH via fallback from the WETH contract } //****ADD LIQUIDITY**** //添加流动性内部方法，通过该方法计算出两个币的实际所需数量 function _addLiquidity( address tokenA,//代币地址A address tokenB,//代币地址B uint amountADesired,//代币A期望添加量 uint amountBDesired,//代币B期望添加量 uint amountAMin,//代币A最小添加量(这两个min,收益添加的时候可以和Desired一样，二次添加的时候，一般都是小于Desired，具体小多少，算法可以查看uniswap前端代码) uint amountBMin//代币B最小添加量 )internal virtual returns(uint amountA,uint amountB){//返回值是两个 //create the pair if it doesn't exist yet //通过factory,查询pair,如果等于0地址，就表示还没有该交易对，调用创建方法 if(IUniswapV2Factory(factory).getPair(tokenA,tokenB)==address(0)){ IUniswapV2Factory(factory).createPair(tokenA,tokenB);//创建交易对 }功能及详细：MrsFu123 //可以先了解下UniswapV2Library中相关方法的意思 //如果查询两个值都是0，首次添加，直接使用期望值 (uint reserveA,uint reserveB)=UniswapV2Library.getReserves(factory,tokenA,tokenB); if(reserveA==0&&reserveB==0){ (amountA,amountB)=(amountADesired,amountBDesired);//直接使用这两个值，比例就是相互的币价 }else{ //如果