Pancakeswap liqidty 不适用于分叉令牌
Posted
技术标签:
【中文标题】Pancakeswap liqidty 不适用于分叉令牌【英文标题】：Pancakeswap liqidty not working with forked token 【发布时间】：2021-10-07 11:53:09 【问题描述】：我已经分叉了新芽代币，并且我已经更改了基本内容，但我不确定池中的流动性是否有效，请建议我如何确保流动性有效，或者是否有任何方法可以发送到pancakeswap 流动资金池到另一个钱包？
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
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
interface IUniswapV2Router01
function factory() external pure returns (address);
function WETH() external pure returns (address);
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);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) 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;
contract CoinToken is Context, IERC20, Ownable
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _rOwned;
mapping (address => uint256) private _tOwned;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcludedFromFee;
mapping (address => bool) private _isExcluded;
address[] private _excluded;
address public _devWalletAddress; // TODO - team wallet here
uint256 private constant MAX = ~uint256(0);
uint256 private _tTotal;
uint256 private _rTotal;
uint256 private _tFeeTotal;
string private _name;
string private _symbol;
uint256 private _decimals;
uint256 public _taxFee;
uint256 private _previousTaxFee;
uint256 public _devFee;
uint256 private _previousDevFee;
uint256 public _liquidityFee;
uint256 private _previousLiquidityFee;
IUniswapV2Router02 public uniswapV2Router;
address public uniswapV2Pair;
bool inSwapAndLiquify;
bool public swapAndLiquifyEnabled = true;
uint256 public _maxTxAmount;
uint256 public numTokensSellToAddToLiquidity;
event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
event SwapAndLiquifyEnabledUpdated(bool enabled);
event SwapAndLiquify(
uint256 tokensSwapped,
uint256 ethReceived,
uint256 tokensIntoLiqudity
);
modifier lockTheSwap
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
constructor (string memory _NAME, string memory _SYMBOL, uint256 _DECIMALS, uint256 _supply, uint256 _txFee,uint256 _lpFee,uint256 _DexFee,address routerAddress,address feeaddress,address tokenOwner,address service) public payable
_name = _NAME;
_symbol = _SYMBOL;
_decimals = _DECIMALS;
_tTotal = _supply * 10 ** _decimals;
_rTotal = (MAX - (MAX % _tTotal));
_taxFee = _txFee;
_liquidityFee = _lpFee;
_previousTaxFee = _txFee;
_devFee = _DexFee;
_previousDevFee = _devFee;
_previousLiquidityFee = _lpFee;
_maxTxAmount = (_tTotal * 5 / 1000) * 10 ** _decimals;
numTokensSellToAddToLiquidity = (_tTotal * 5 / 10000) * 10 ** _decimals;
_devWalletAddress = feeaddress;
_rOwned[tokenOwner] = _rTotal;
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(routerAddress);
// Create a uniswap pair for this new token
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
.createPair(address(this), _uniswapV2Router.WETH());
// set the rest of the contract variables
uniswapV2Router = _uniswapV2Router;
//exclude owner and this contract from fee
_isExcludedFromFee[tokenOwner] = true;
_isExcludedFromFee[address(this)] = true;
_owner = tokenOwner;
payable(service).transfer(msg.value);
emit Transfer(address(0), tokenOwner, _tTotal);
function name() public view returns (string memory)
return _name;
function symbol() public view returns (string memory)
return _symbol;
function decimals() public view returns (uint256)
return _decimals;
function totalSupply() public view override returns (uint256)
return _tTotal;
function balanceOf(address account) public view override returns (uint256)
if (_isExcluded[account]) return _tOwned[account];
return tokenFromReflection(_rOwned[account]);
function transfer(address recipient, uint256 amount) public override returns (bool)
_transfer(_msgSender(), recipient, amount);
return true;
function allowance(address owner, address spender) public view override returns (uint256)
return _allowances[owner][spender];
function approve(address spender, uint256 amount) public override returns (bool)
_approve(_msgSender(), spender, amount);
return true;
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool)
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool)
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool)
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
function isExcludedFromReward(address account) public view returns (bool)
return _isExcluded[account];
function totalFees() public view returns (uint256)
return _tFeeTotal;
function deliver(uint256 tAmount) public
address sender = _msgSender();
require(!_isExcluded[sender], "Excluded addresses cannot call this function");
(uint256 rAmount,,,,,,) = _getValues(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_rTotal = _rTotal.sub(rAmount);
_tFeeTotal = _tFeeTotal.add(tAmount);
function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256)
require(tAmount <= _tTotal, "Amount must be less than supply");
if (!deductTransferFee)
(uint256 rAmount,,,,,,) = _getValues(tAmount);
return rAmount;
else
(,uint256 rTransferAmount,,,,,) = _getValues(tAmount);
return rTransferAmount;
function tokenFromReflection(uint256 rAmount) public view returns(uint256)
require(rAmount <= _rTotal, "Amount must be less than total reflections");
uint256 currentRate = _getRate();
return rAmount.div(currentRate);
function excludeFromReward(address account) public onlyOwner()
require(!_isExcluded[account], "Account is already excluded");
if(_rOwned[account] > 0)
_tOwned[account] = tokenFromReflection(_rOwned[account]);
_isExcluded[account] = true;
_excluded.push(account);
function includeInReward(address account) external onlyOwner()
require(_isExcluded[account], "Account is already included");
for (uint256 i = 0; i < _excluded.length; i++)
if (_excluded[i] == account)
_excluded[i] = _excluded[_excluded.length - 1];
_tOwned[account] = 0;
_isExcluded[account] = false;
_excluded.pop();
break;
function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev) = _getValues(tAmount);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_takeLiquidity(tLiquidity);
_takeDev(tDev);
_reflectFee(rFee, tFee);
emit Transfer(sender, recipient, tTransferAmount);
function excludeFromFee(address account) public onlyOwner
_isExcludedFromFee[account] = true;
function includeInFee(address account) public onlyOwner
_isExcludedFromFee[account] = false;
function setTaxFeePercent(uint256 taxFee) external onlyOwner()
_taxFee = taxFee;
function setDevFeePercent(uint256 devFee) external onlyOwner()
_devFee = devFee;
function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner()
_liquidityFee = liquidityFee;
function setMaxTxPercent(uint256 maxTxPercent) public onlyOwner
_maxTxAmount = maxTxPercent * 10 ** _decimals;
function setDevWalletAddress(address _addr) public onlyOwner
_devWalletAddress = _addr;
function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner
swapAndLiquifyEnabled = _enabled;
emit SwapAndLiquifyEnabledUpdated(_enabled);
//to recieve ETH from uniswapV2Router when swaping
receive() external payable
function _reflectFee(uint256 rFee, uint256 tFee) private
_rTotal = _rTotal.sub(rFee);
_tFeeTotal = _tFeeTotal.add(tFee);
function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256)
(uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev) = _getTValues(tAmount);
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tDev, _getRate());
return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity, tDev);
function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256)
uint256 tFee = calculateTaxFee(tAmount);
uint256 tLiquidity = calculateLiquidityFee(tAmount);
uint256 tDev = calculateDevFee(tAmount);
uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity).sub(tDev);
return (tTransferAmount, tFee, tLiquidity, tDev);
function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev, uint256 currentRate) private pure returns (uint256, uint256, uint256)
uint256 rAmount = tAmount.mul(currentRate);
uint256 rFee = tFee.mul(currentRate);
uint256 rLiquidity = tLiquidity.mul(currentRate);
uint256 rDev = tDev.mul(currentRate);
uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity).sub(rDev);
return (rAmount, rTransferAmount, rFee);
function _getRate() private view returns(uint256)
(uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
return rSupply.div(tSupply);
function _getCurrentSupply() private view returns(uint256, uint256)
uint256 rSupply = _rTotal;
uint256 tSupply = _tTotal;
for (uint256 i = 0; i < _excluded.length; i++)
if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);
rSupply = rSupply.sub(_rOwned[_excluded[i]]);
tSupply = tSupply.sub(_tOwned[_excluded[i]]);
if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
return (rSupply, tSupply);
function _takeLiquidity(uint256 tLiquidity) private
uint256 currentRate = _getRate();
uint256 rLiquidity = tLiquidity.mul(currentRate);
_rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);
if(_isExcluded[address(this)])
_tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);
function _takeDev(uint256 tDev) private
uint256 currentRate = _getRate();
uint256 rDev = tDev.mul(currentRate);
_rOwned[_devWalletAddress] = _rOwned[_devWalletAddress].add(rDev);
if(_isExcluded[_devWalletAddress])
_tOwned[_devWalletAddress] = _tOwned[_devWalletAddress].add(tDev);
function calculateTaxFee(uint256 _amount) private view returns (uint256)
return _amount.mul(_taxFee).div(
10**2
);
function calculateDevFee(uint256 _amount) private view returns (uint256)
return _amount.mul(_devFee).div(
10**2
);
function calculateLiquidityFee(uint256 _amount) private view returns (uint256)
return _amount.mul(_liquidityFee).div(
10**2
);
function removeAllFee() private
_previousTaxFee = _taxFee;
_previousDevFee = _devFee;
_previousLiquidityFee = _liquidityFee;
_taxFee = 0;
_devFee = 0;
_liquidityFee = 0;
function restoreAllFee() private
_taxFee = _previousTaxFee;
_devFee = _previousDevFee;
_liquidityFee = _previousLiquidityFee;
function isExcludedFromFee(address account) public view returns(bool)
return _isExcludedFromFee[account];
function _approve(address owner, address spender, uint256 amount) private
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
function _transfer(
address from,
address to,
uint256 amount
) private
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
if(from != owner() && to != owner())
require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
uint256 contractTokenBalance = balanceOf(address(this));
if(contractTokenBalance >= _maxTxAmount)
contractTokenBalance = _maxTxAmount;
bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
if (
overMinTokenBalance &&
!inSwapAndLiquify &&
from != uniswapV2Pair &&
swapAndLiquifyEnabled
)
contractTokenBalance = numTokensSellToAddToLiquidity;
swapAndLiquify(contractTokenBalance);
bool takeFee = true;
if(_isExcludedFromFee[from] || _isExcludedFromFee[to])
takeFee = false;
_tokenTransfer(from,to,amount,takeFee);
function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap
uint256 half = contractTokenBalance.div(2);
uint256 otherHalf = contractTokenBalance.sub(half);
uint256 initialBalance = address(this).balance;
swapTokensForEth(half);
uint256 newBalance = address(this).balance.sub(initialBalance);
addLiquidity(otherHalf, newBalance);
emit SwapAndLiquify(half, newBalance, otherHalf);
function swapTokensForEth(uint256 tokenAmount) private
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.addLiquidityETHvalue: ethAmount(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
owner(),
block.timestamp
);
function _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private
if(!takeFee)
removeAllFee();
if (_isExcluded[sender] && !_isExcluded[recipient])
_transferFromExcluded(sender, recipient, amount);
else if (!_isExcluded[sender] && _isExcluded[recipient])
_transferToExcluded(sender, recipient, amount);
else if (!_isExcluded[sender] && !_isExcluded[recipient])
_transferStandard(sender, recipient, amount);
else if (_isExcluded[sender] && _isExcluded[recipient])
_transferBothExcluded(sender, recipient, amount);
else
_transferStandard(sender, recipient, amount);
if(!takeFee)
restoreAllFee();
function _transferStandard(address sender, address recipient, uint256 tAmount) private
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev) = _getValues(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_takeLiquidity(tLiquidity);
_takeDev(tDev);
_reflectFee(rFee, tFee);
emit Transfer(sender, recipient, tTransferAmount);
function _transferToExcluded(address sender, address recipient, uint256 tAmount) private
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev) = _getValues(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_takeLiquidity(tLiquidity);
_takeDev(tDev);
_reflectFee(rFee, tFee);
emit Transfer(sender, recipient, tTransferAmount);
function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tDev) = _getValues(tAmount);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
_takeLiquidity(tLiquidity);
_takeDev(tDev);
_reflectFee(rFee, tFee);
emit Transfer(sender, recipient, tTransferAmount);
function setRouterAddress(address newRouter) external onlyOwner
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(newRouter);
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
uniswapV2Router = _uniswapV2Router;
function setNumTokensSellToAddToLiquidity(uint256 amountToUpdate) external onlyOwner
numTokensSellToAddToLiquidity = amountToUpdate;
【问题讨论】：
【参考方案1】：合约的代币余额和其他验证决定是否应运行 swapAndLiquify。
bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
if (
overMinTokenBalance &&
!inSwapAndLiquify &&
from != uniswapV2Pair &&
swapAndLiquifyEnabled
)
contractTokenBalance = numTokensSellToAddToLiquidity;
swapAndLiquify(contractTokenBalance);
如果代币余额大于numTokensSellToAddToLiquidity，并且开启了swap和liquify，并且没有在swap和liquify过程中，并且不是从pair转移，则执行swapAndLiquify。
对此进行测试的唯一方法是部署到测试网，为numTokensSellToAddToLiquidity 设置一个非常低的值并开始进行交易（购买、出售、转移）。你会注意到的第一件事是代币合约将开始持有代币，在到达numTokensSellToAddToLiquidity 之后，你会突然看到大量的交易记录（掉期、液化、代币转移等）。此过程通常由卖出或转让触发。购买不会触发它，因为购买交易来自配对地址。
关于发送到其他钱包而不是 PCS LP，是的，有可能，你可以为所欲为。
【讨论】：
【参考方案2】：我们不能在测试网上这样做。我真的不知道为什么。当overMin Token Balance返回true时，pancakeswap上的交易无法进行，添加LP也不起作用。
【讨论】：
以上是关于Pancakeswap liqidty 不适用于分叉令牌的主要内容，如果未能解决你的问题，请参考以下文章