阐述永续合约交易所系统开发方案逻辑及案例项目丨源码程序

　　DApp是指基于区块链技术的去中心化应用程序，它的特点是去中心化、透明、安全、不可篡改等，DApp is an inevitable trend because it can solve problems such as centralization,data privacy,and security in traditional applications,while also achieving more fair,transparent,and decentralized application scenarios.　　DApp和APP的最大不同在于，DApp是基于区块练技术的去中心化应用程序，而APP是基于中心化服务器的应用程序，The data storage and processing of DApp are distributed,without centralized servers,so it has higher security and reliability.　　function addLiquidity(　　address tokenA,　　address tokenB,　　uint amountADesired,　　uint amountBDesired,　　uint amountAMin,　　uint amountBMin,　　address to,　　uint deadline　　)external returns(uint amountA,uint amountB,uint liquidity);　　if(IUniswapV2Factory(factory).getPair(tokenA,tokenB)==address(0)){　　IUniswapV2Factory(factory).createPair(tokenA,tokenB);　　}　　pair=address(uint(keccak256(abi.encodePacked(address(uint(keccak256(abi.encodePacked(　　hex'ff',　　factory,　　keccak256(abi.encodePacked(token0,token1)),　　hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f'//init code hash　　))));　　function removeLiquidity(　　address tokenA,　　address tokenB,　　uint liquidity,　　uint amountAMin,　　uint amountBMin,　　address to,　　uint deadline　　)external returns(uint amountA,uint amountB);