ETH交易值始终0

Question

我正在尝试使用uniswap v3为我的项目添加掉期。每当我从前端调用合同中的功能时，值为0 ETH中的MetAmask中，只有支付费用。 我尝试了所有可以想到的方式将输入字符串转换为WEI，GWEI，HEX等，等等在MetAmask交易页面上始终为0。

function transferApprove(uint _amountIn, address _routerAddress) internal
    {
        TransferHelper.safeTransferFrom(
            ETH,
            msg.sender,
            address(this),
            _amountIn
        );

        TransferHelper.safeApprove(WETH9, _routerAddress, _amountIn);
    }

    function swapExactInputSingle(uint _amountIn)  external returns (uint amountOut)
    {
      require(_amountIn > 0, "cannot swap 0 ETH");
      emit value(_amountIn);
        transferApprove(_amountIn, UNISWAP_V3_ROUTER);

        ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
            .ExactInputSingleParams({
                tokenIn: ETH,
                tokenOut: WETH9,
                fee: 3000,
                recipient: msg.sender,
                deadline: block.timestamp,
                amountIn: _amountIn,
                amountOutMinimum: 0,
                sqrtPriceLimitX96: 0
            });

        amountOut = uniswapRouter.exactInputSingle(params);
    }

///// JAvaScript部分

const sendSwap = async () => {
try{
    if(!window.ethereum) return alert("Please install metamask");
    const parsedAmount = ethers.utils.parseUnits(amount, 18);
    const provider = new ethers.providers.Web3Provider(window.ethereum, "any")
    const signer = provider.getSigner()
    const swap = new ethers.Contract(SwapAddress.address, SwapAbi.abi, signer)
    
    const accounts = await ethereum.request({method:'eth_requestAccounts'})
    setCurrentAccount(accounts[0])
    setSwap(swap)

    console.log(parsedAmount)
    const transactionHash = await swap.swapExactInputSingle(parsedAmount)
    setIsLoading(true);
    await transactionHash.wait();
    setIsLoading(false);
    console.log({transactionHash});
} catch (error) {
    console.log(error);
}