深入分析阿凡達Avatar泰山眾籌系統開發詳細方案及案例原始碼

　　新零售，即個人、企業以網際網路為依託，透過運用大資料、人工智慧等先進技術手段，對商品的生產、流通與銷售過程進行升級改造，進而重塑業態結構與生態圈，並對線上服務、線下體驗以及現代物流進行深度融合的零售新模式。

　　個人、企業以網際網路為依託，透過運用大資料、人工智慧等先進技術手段，對商品的生產、流通與銷售過程進行升級改造，進而重塑業態結構與生態圈，並對線上服務、線下體驗以及現代物流進行深度融合的零售新模式。

　　原始碼說明：首次新增和二次新增lp演演算法有點差別

　　查詢pair和建立pair，使用了create2，有需要可以具體瞭解

　　uniswap v2都是兩個erc20組合成一個交易對，跟eth相關的內部都是使用的weth交易

　　交易方法中都是in/out，相對於pair,開發方案及案例I35功能7O98開發O7I8,方法中swapExactTokensForTokens，for的兩側帶有Exact的，表示該側的數是固定的精確數，另一邊的數量是需要看實際成交時交易池情況，所以也就有了amountOutMin,amountInMax

　　_swap和_swapSupportingFeeOnTransferTokens的差別是前者是輸入引數的數計算得來的amounts,後者是以交易對實際得到的數去計算

　　/**

　　*Submitted for verification at Etherscan.io on 

　　*/

　　pragma solidity=0.6.6;

　　interface IUniswapV2Factory{需求及模式：MrsFu123

　　event PairCreated(address indexed token0,address indexed token1,address pair,uint);

　　function feeTo()external view returns(address);

　　function feeToSetter()external view returns(address);

　　function getPair(address tokenA,address tokenB)external view returns(address pair);

　　function allPairs(uint)external view returns(address pair);

　　function allPairsLength()external view returns(uint);

　　function createPair(address tokenA,address tokenB)external returns(address pair);

　　function setFeeTo(address)external;

　　function setFeeToSetter(address)external;

　　}

　　interface IUniswapV2Pair{

　　event Approval(address indexed owner,address indexed spender,uint value);

　　event Transfer(address indexed from,address indexed to,uint value);

　　function name()external pure returns(string memory);

　　function symbol()external pure returns(string memory);

　　function decimals()external pure returns(uint8);

　　function totalSupply()external view returns(uint);

　　function balanceOf(address owner)external view returns(uint);

　　function allowance(address owner,address spender)external view returns(uint);

　　function approve(address spender,uint value)external returns(bool);

　　function transfer(address to,uint value)external returns(bool);

　　function transferFrom(address from,address to,uint value)external returns(bool);

　　function DOMAIN_SEPARATOR()external view returns(bytes32);

　　function PERMIT_TYPEHASH()external pure returns(bytes32);

　　function nonces(address owner)external view returns(uint);

　　function permit(address owner,address spender,uint value,uint deadline,uint8 v,bytes32 r,bytes32 s)external;

　　event Mint(address indexed sender,uint amount0,uint amount1);

　　event Burn(address indexed sender,uint amount0,uint amount1,address indexed to);

　　event Swap(

　　address indexed sender,

　　uint amount0In,

　　uint amount1In,

　　uint amount0Out,

　　uint amount1Out,

　　address indexed to

　　);

　　)external returns(uint[]memory amounts);

　　function swapTokensForExactTokens(

　　uint amountOut,

　　uint amountInMax,

　　address[]calldata path,

　　address to,

　　uint deadline

　　)external returns(uint[]memory amounts);

　　function swapExactETHForTokens(uint amountOutMin,address[]calldata path,address to,uint deadline)

　　external

　　payable

　　returns(uint[]memory amounts);

　　function swapTokensForExactETH(uint amountOut,uint amountInMax,address[]calldata path,address to,uint deadline)

　　external

　　returns(uint[]memory amounts);

　　function swapExactTokensForETH(uint amountIn,uint amountOutMin,address[]calldata path,address to,uint deadline)

　　external

　　returns(uint[]memory amounts);

　　function swapETHForExactTokens(uint amountOut,address[]calldata path,address to,uint deadline)

　　external

　　payable

　　returns(uint[]memory amounts);

　　function quote(uint amountA,uint reserveA,uint reserveB)external pure returns(uint amountB);

　　function getAmountOut(uint amountIn,uint reserveIn,uint reserveOut)external pure returns(uint amountOut);

　　function getAmountIn(uint amountOut,uint reserveIn,uint reserveOut)external pure returns(uint amountIn);

　　function getAmountsOut(uint amountIn,address[]calldata path)external view returns(uint[]memory amounts);

　　function getAmountsIn(uint amountOut,address[]calldata path)external view returns(uint[]memory amounts);

　　}

　　interface IUniswapV2Router02 is IUniswapV2Router01{

　　function removeLiquidityETHSupportingFeeOnTransferTokens(

　　address token,

　　uint liquidity,

　　uint amountTokenMin,

　　uint amountETHMin,

　　address to,

　　uint deadline

　　)external returns(uint amountETH);

　　function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(

　　address token,

　　uint liquidity,

　　uint amountTokenMin,

　　uint amountETHMin,

　　address to,

　　uint deadline,

　　bool approveMax,uint8 v,bytes32 r,bytes32 s

　　)external returns(uint amountETH);

　　function swapExactTokensForTokensSupportingFeeOnTransferTokens(

　　uint amountIn,

　　uint amountOutMin,

　　address[]calldata path,

　　address to,

　　uint deadline

　　)external;

　　function swapExactETHForTokensSupportingFeeOnTransferTokens(

　　uint amountOutMin,

　　address[]calldata path,

　　address to,

　　uint deadline

　　)external payable;

　　function swapExactTokensForETHSupportingFeeOnTransferTokens(

　　uint amountIn,

　　uint amountOutMin,

　　address[]calldata path,

　　address to,

　　uint deadline

　　)external;

　　}