阿凡达泰山众筹(Avata)开发功能版，阿凡达泰山众筹(Avata)系统开发技术分析及源码
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function removeLiquidityETHWithPermit(//WithPermit,移除时，其中一个返回eth
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax,uint8 v,bytes32 r,bytes32 s
)external virtual override returns(uint amountToken,uint amountETH){
/*
获取到pair,调用pair的permit(内部实际就是授权给路由),
*/
address pair=UniswapV2Library.pairFor(factory,token,WETH);
uint value=approveMax?uint(-1):liquidity;模式及功能I35方案7O98开发O7I8
IUniswapV2Pair(pair).permit(msg.sender,address(this),value,deadline,v,r,s);
//最终还是调用上面的removeLiquidityETH方法！
(amountToken,amountETH)=removeLiquidityETH(token,liquidity,amountTokenMin,amountETHMin,to,deadline);
}
//****REMOVE LIQUIDITY(supporting fee-on-transfer tokens)****
//移除流动性(需要先授权)，支持转账会扣手续费的代币s
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
)public virtual override ensure(deadline)returns(uint amountETH){
//实际还是调用removeLiquidity，传入的是weth,
(,amountETH)=removeLiquidity(
token,
WETH,
liquidity,
amountTokenMin,//实际就是这两个值，填很小，就可以成功
amountETHMin,//实际就是这两个值，填很小，就可以成功
address(this),
deadline
);详情及分析:MrsFu123
//removeLiquidity返回的第一个参数是代币数量，由于代币转账会扣手续费，所以，实际到达路由的代币数量并没有这么多！直接取余额转出
TransferHelper.safeTransfer(token,to,IERC20(token).balanceOf(address(this)));//如果转账扣两次手续费..这里相当于扣两次，pair->router,router->to
//将weth转换eth,再转给to,
IWETH(WETH).withdraw(amountETH);
TransferHelper.safeTransferETH(to,amountETH);
}
//同上，先验签授权，再调用上面的removeLiquidityETHSupportingFeeOnTransferTokens
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax,uint8 v,bytes32 r,bytes32 s
)external virtual override returns(uint amountETH){
address pair=UniswapV2Library.pairFor(factory,token,WETH);
uint value=approveMax?uint(-1):liquidity;
IUniswapV2Pair(pair).permit(msg.sender,address(this),value,deadline,v,r,s);
amountETH=removeLiquidityETHSupportingFeeOnTransferTokens(
token,liquidity,amountTokenMin,amountETHMin,to,deadline
);
}
