SignThis-Frontend/amm_interface.html at main · Serenayyy123/SignThis-Frontend · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>AMM 兑换与流动性界面 - 最终稳定版 (v4)</title>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/ethers/6.7.0/ethers.umd.min.js" type="application/javascript"></script>

    <style>
        /* CSS 样式，保持简洁和可读性 */
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f7f9fc;
            padding: 20px;
        }
        .container {
            max-width: 600px;
            margin: 0 auto;
            background: #fff;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        h2 {
            text-align: center;
            color: #007bff;
            margin-bottom: 25px;
        }
        .status {
            padding: 10px;
            margin-bottom: 15px;
            border-radius: 6px;
            background-color: #e9f5ff;
            color: #0056b3;
            border: 1px solid #cce5ff;
        }
        .section {
            padding: 15px;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            margin-bottom: 20px;
            background-color: #fcfcfc;
        }
        input[type="number"], .input-group button {
            padding: 10px;
            margin-right: 10px;
            border-radius: 4px;
            border: 1px solid #ccc;
            width: 150px;
            box-sizing: border-box;
            margin-bottom: 10px;
        }
        button {
            padding: 10px 15px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.2s;
            margin-top: 5px;
        }
        .btn-connect { background-color: #28a745; color: white; }
        .btn-connect:hover { background-color: #218838; }
        .btn-approve { background-color: #ffc107; color: #333; }
        .btn-approve:hover { background-color: #e0a800; }
        .btn-primary { background-color: #007bff; color: white; }
        .btn-primary:hover { background-color: #0056b3; }
        .btn-direction { background-color: #f8f9fa; border: 1px solid #ccc; color: #333; margin: 0 5px 10px 0; }
        .btn-active-direction { background-color: #007bff; color: white; border: 1px solid #007bff; margin: 0 5px 10px 0; }
        .reserves p { margin: 5px 0; font-size: 1.1em; }
    </style>
</head>
<body>

<div class="container">
    <h2>🚀 自动做市商 (AMM) 界面</h2>

    <div id="status" class="status">请连接您的钱包...</div>

    <div id="wallet-info" style="text-align: center; margin-bottom: 20px;">
        <button id="connect-wallet" class="btn-connect">连接钱包</button>
    </div>

    <hr>

    <div class="section reserves">
        <h3>🏦 池子状态</h3>
        <p>Token A 储备: <strong id="reserve-a">0</strong></p>
        <p>Token B 储备: <strong id="reserve-b">0</strong></p>
        <p>您的 LP 代币余额: <strong id="lp-balance">0</strong></p>
    </div>

    <hr>

    <div class="section">
        <h3>🔒 步骤 1: 授权代币</h3>
        <button id="approve-a" class="btn-approve" disabled>授权 Token A</button>
        <button id="approve-b" class="btn-approve" disabled>授权 Token B</button>
        <p style="font-size: 0.8em; color: gray; margin-top: 10px;">必须授权 AMM 合约才能使用您的代币。</p>
    </div>

    <hr>

    <div class="section">
        <h3>➕ 步骤 2: 添加流动性</h3>
        <input type="number" id="input-a-add" placeholder="Token A 数量">
        <input type="number" id="input-b-add" placeholder="Token B 数量">
        <button id="add-liquidity" class="btn-primary" disabled>添加流动性</button>
    </div>

    <hr>

    <div class="section">
        <h3>➖ 步骤 3: 移除流动性</h3>
        <input type="number" id="input-lp-remove" placeholder="LP Token 数量">
        <button id="remove-liquidity" class="btn-primary" disabled>移除流动性</button>
    </div>

    <hr>

    <div class="section">
        <h3>🔄 步骤 4: 兑换代币</h3>
        <div style="margin-bottom: 10px;">
            <button id="swap-a-to-b" class="btn-active-direction">A → B</button>
            <button id="swap-b-to-a" class="btn-direction">B → A</button>
        </div>

        <input type="number" id="input-swap" placeholder="输入兑换数量">
        <p style="font-size: 0.9em; color: #6c757d;">预计收到的数量将根据滑点容忍度计算。</p>

        <button id="execute-swap" class="btn-primary" disabled>执行兑换 (A → B)</button>
    </div>

</div>

<script>
    const { ethers } = window;

    // ==========================================================
    // 1. 您的配置信息
    // ==========================================================
    // 🚨 关键更新：AMM 合约地址
    const AMM_ADDRESS = "0x8181A6147f1649DC771c716290fA0D9E42640559";

    // Token A 地址 (保持不变)
    const TOKEN_A_ADDRESS = "0x113ecc7d890ced42a4822877370eff5db5fc6b06";
    // Token B 新地址
    const TOKEN_B_ADDRESS = "0xa6e27e0808ab5c5874793e08d2084ffd72489290";

    const DECIMALS = 18;

    const MAX_UINT256 = ethers ? ethers.MaxUint256 : (2n**256n - 1n);
    const SLIPPAGE_TOLERANCE = 0.995;

    // 简化 ERC20 ABI
    const ERC20_ABI = [
        "function approve(address spender, uint256 value) external returns (bool)",
        "function allowance(address owner, address spender) external view returns (uint256)",
        "function balanceOf(address account) external view returns (uint256)",
        "function decimals() external view returns (uint8)",
    ];

    // 您的 AMM 合约的完整 JSON ABI (保持不变)
    const AMM_ABI = [
        {"inputs": [{"internalType": "uint256", "name": "amountA", "type": "uint256"}, {"internalType": "uint256", "name": "amountB", "type": "uint256"}], "name": "addLiquidity", "outputs": [], "stateMutability": "nonpayable", "type": "function"},
        {"inputs": [{"internalType": "address", "name": "spender", "type": "address"}, {"internalType": "uint256", "name": "value", "type": "uint256"}], "name": "approve", "outputs": [{"internalType": "bool", "name": "", "type": "bool"}], "stateMutability": "nonpayable", "type": "function"},
        {"inputs": [{"internalType": "address", "name": "_tokenA", "type": "address"}, {"internalType": "address", "name": "_tokenB", "type": "address"}, {"internalType": "string", "name": "_name", "type": "string"}, {"internalType": "string", "name": "_symbol", "type": "string"}], "stateMutability": "nonpayable", "type": "constructor"},
        {"inputs": [{"internalType": "address", "name": "spender", "type": "address"}, {"internalType": "uint256", "name": "allowance", "type": "uint256"}, {"internalType": "uint256", "name": "needed", "type": "uint256"}], "name": "ERC20InsufficientAllowance", "type": "error"},
        {"inputs": [{"internalType": "address", "name": "sender", "type": "address"}, {"internalType": "uint256", "name": "balance", "type": "uint256"}, {"internalType": "uint256", "name": "needed", "type": "uint256"}], "name": "ERC20InsufficientBalance", "type": "error"},
        {"inputs": [{"internalType": "address", "name": "approver", "type": "address"}], "name": "ERC20InvalidApprover", "type": "error"},
        {"inputs": [{"internalType": "address", "name": "receiver", "type": "address"}], "name": "ERC20InvalidReceiver", "type": "error"},
        {"inputs": [{"internalType": "address", "name": "sender", "type": "address"}], "name": "ERC20InvalidSender", "type": "error"},
        {"inputs": [{"internalType": "address", "name": "spender", "type": "address"}], "name": "ERC20InvalidSpender", "type": "error"},
        {"anonymous": false, "inputs": [{"indexed": true, "internalType": "address", "name": "owner", "type": "address"}, {"indexed": true, "internalType": "address", "name": "spender", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "value", "type": "uint256"}], "name": "Approval", "type": "event"},
        {"anonymous": false, "inputs": [{"indexed": true, "internalType": "address", "name": "provider", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "amountA", "type": "uint256"}, {"indexed": false, "internalType": "uint256", "name": "amountB", "type": "uint256"}, {"indexed": false, "internalType": "uint256", "name": "liquidity", "type": "uint256"}], "name": "LiquidityAdded", "type": "event"},
        {"anonymous": false, "inputs": [{"indexed": true, "internalType": "address", "name": "provider", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "amountA", "type": "uint256"}, {"indexed": false, "internalType": "uint256", "name": "amountB", "type": "uint256"}, {"indexed": false, "internalType": "uint256", "name": "liquidity", "type": "uint256"}], "name": "LiquidityRemoved", "type": "event"},
        {"inputs": [{"internalType": "uint256", "name": "liquidityToRemove", "type": "uint256"}], "name": "removeLiquidity", "outputs": [{"internalType": "uint256", "name": "amountAOut", "type": "uint256"}, {"internalType": "uint256", "name": "amountBOut", "type": "uint256"}], "stateMutability": "nonpayable", "type": "function"},
        {"inputs": [{"internalType": "uint256", "name": "amountAIn", "type": "uint256"}, {"internalType": "uint256", "name": "minBOut", "type": "uint256"}], "name": "swapAforB", "outputs": [], "stateMutability": "nonpayable", "type": "function"},
        {"inputs": [{"internalType": "uint256", "name": "amountBIn", "type": "uint256"}, {"internalType": "uint256", "name": "minAOut", "type": "uint256"}], "name": "swapBforA", "outputs": [], "stateMutability": "nonpayable", "type": "function"},
        {"anonymous": false, "inputs": [{"indexed": true, "internalType": "address", "name": "trader", "type": "address"}, {"indexed": false, "internalType": "address", "name": "tokenIn", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "amountIn", "type": "uint256"}, {"indexed": false, "internalType": "address", "name": "tokenOut", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "amountOut", "type": "uint256"}], "name": "TokensSwapped", "type": "event"},
        {"inputs": [{"internalType": "address", "name": "to", "type": "address"}, {"internalType": "uint256", "name": "value", "type": "uint256"}], "name": "transfer", "outputs": [{"internalType": "bool", "name": "", "type": "bool"}], "stateMutability": "nonpayable", "type": "function"},
        {"anonymous": false, "inputs": [{"indexed": true, "internalType": "address", "name": "from", "type": "address"}, {"indexed": true, "internalType": "address", "name": "to", "type": "address"}, {"indexed": false, "internalType": "uint256", "name": "value", "type": "uint256"}], "name": "Transfer", "type": "event"},
        {"inputs": [{"internalType": "address", "name": "from", "type": "address"}, {"internalType": "address", "name": "to", "type": "address"}, {"internalType": "uint256", "name": "value", "type": "uint256"}], "name": "transferFrom", "outputs": [{"internalType": "bool", "name": "", "type": "bool"}], "stateMutability": "nonpayable", "type": "function"},
        {"inputs": [{"internalType": "address", "name": "owner", "type": "address"}, {"internalType": "address", "name": "spender", "type": "address"}], "name": "allowance", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"},
        {"inputs": [{"internalType": "address", "name": "account", "type": "address"}], "name": "balanceOf", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "decimals", "outputs": [{"internalType": "uint8", "name": "", "type": "uint8"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "getReserves", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}, {"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "name", "outputs": [{"internalType": "string", "name": "", "type": "string"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "owner", "outputs": [{"internalType": "address", "name": "", "type": "address"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "reserveA", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "reserveB", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "symbol", "outputs": [{"internalType": "string", "name": "", "type": "string"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "tokenA", "outputs": [{"internalType": "contract IERC20", "name": "", "type": "address"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "tokenB", "outputs": [{"internalType": "contract IERC20", "name": "", "type": "address"}], "stateMutability": "view", "type": "function"},
        {"inputs": [], "name": "totalSupply", "outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}], "stateMutability": "view", "type": "function"}
    ];
    // ==========================================================

    // 状态变量
    let provider = null;
    let signer = null;
    let account = null;
    let reserves = { A: 0, B: 0 };
    let isAtoB = true;

    // DOM 元素引用
    const dom = {
        status: document.getElementById('status'),
        connectButton: document.getElementById('connect-wallet'),
        reserveA: document.getElementById('reserve-a'),
        reserveB: document.getElementById('reserve-b'),
        lpBalance: document.getElementById('lp-balance'),
        approveA: document.getElementById('approve-a'),
        approveB: document.getElementById('approve-b'),
        inputAAdd: document.getElementById('input-a-add'),
        inputBAdd: document.getElementById('input-b-add'),
        addLiquidityBtn: document.getElementById('add-liquidity'),
        inputLPRemove: document.getElementById('input-lp-remove'),
        removeLiquidityBtn: document.getElementById('remove-liquidity'),
        swapAtoBBtn: document.getElementById('swap-a-to-b'),
        swapBtoABtn: document.getElementById('swap-b-to-a'),
        inputSwap: document.getElementById('input-swap'),
        executeSwapBtn: document.getElementById('execute-swap'),
    };

    // 辅助函数
    function updateStatus(message, isError = false) {
        dom.status.textContent = message;
        dom.status.style.backgroundColor = isError ? '#ffe9e9' : '#e9f5ff';
        dom.status.style.color = isError ? '#cc0000' : '#0056b3';
    }

    function setButtonsEnabled(enabled) {
        dom.approveA.disabled = !enabled;
        dom.approveB.disabled = !enabled;
        dom.addLiquidityBtn.disabled = !enabled;
        dom.removeLiquidityBtn.disabled = !enabled;
        dom.executeSwapBtn.disabled = !enabled;
    }

    function getContracts(useSigner = true) {
        if (!provider || !ethers) return {};
        const actor = useSigner && signer ? signer : provider;

        const ammContract = new ethers.Contract(AMM_ADDRESS, AMM_ABI, actor);
        const tokenAContract = new ethers.Contract(TOKEN_A_ADDRESS, ERC20_ABI, actor);
        const tokenBContract = new ethers.Contract(TOKEN_B_ADDRESS, ERC20_ABI, actor);

        return { ammContract, tokenAContract, tokenBContract };
    }

    // ==========================================================
    // 2. 连接钱包 (兼容版)
    // ==========================================================
    async function connectWallet() {
        if (typeof ethers === 'undefined' || !window.ethereum) {
             updateStatus("Ethers.js 未加载或钱包扩展程序未安装。", true);
             return;
        }

        try {
            updateStatus("连接中，请在钱包中确认授权...");

            const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });

            if (accounts && accounts.length > 0) {
                 provider = new ethers.BrowserProvider(window.ethereum);
                 signer = await provider.getSigner();
                 account = accounts[0];

                 setButtonsEnabled(true);
                 dom.connectButton.textContent = `✅ 已连接: ${account.substring(0, 6)}...${account.substring(38)}`;
                 dom.connectButton.disabled = true;
                 updateStatus(`连接成功! 账户: ${account}`);

                 window.ethereum.on('accountsChanged', () => window.location.reload());
                 window.ethereum.on('chainChanged', () => window.location.reload());

                 fetchPoolData();
            } else {
                 updateStatus("钱包未提供账户信息，连接失败。", true);
            }

        } catch (error) {
            console.error("连接失败:", error);
            if (error.code === 4001) {
                updateStatus("连接被用户拒绝。", true);
            } else {
                updateStatus(`连接失败。请检查钱包是否解锁且网络正确。`, true);
            }
        }
    }

    // 获取池子状态和 LP 余额
    async function fetchPoolData() {
        const { ammContract } = getContracts(false);
        if (!ammContract) return;

        try {
            const [reserveA_raw, reserveB_raw] = await ammContract.getReserves();

            reserves.A = ethers.formatUnits(reserveA_raw, DECIMALS);
            reserves.B = ethers.formatUnits(reserveB_raw, DECIMALS);

            dom.reserveA.textContent = reserves.A;
            dom.reserveB.textContent = reserves.B;

            if (account) {
                const lpBalanceRaw = await ammContract.balanceOf(account);
                dom.lpBalance.textContent = ethers.formatUnits(lpBalanceRaw, DECIMALS);
            }

        } catch (error) {
            console.error("无法获取池子数据:", error);
            if (account) {
                updateStatus("无法读取合约数据，请检查网络和合约地址是否正确。", true);
            }
        }
    }

    // 授权代币
    async function handleApprove(tokenContract, tokenName) {
        if (!signer) return;

        updateStatus(`正在发送 ${tokenName} 授权交易...`);
        try {
            // 授权最大金额，避免重复授权
            const tx = await tokenContract.approve(AMM_ADDRESS, MAX_UINT256);
            await tx.wait();
            updateStatus(`${tokenName} 授权成功! Tx Hash: ${tx.hash.substring(0, 10)}...`);
        } catch (error) {
            console.error(`${tokenName} 授权失败:`, error);
            updateStatus(`${tokenName} 授权失败。请确保网络畅通且有 Gas 费用。`, true);
        }
    }

    // ==========================================================
    // 3. 修正后的添加流动性函数 (解决数字转换和错误提示问题)
    // ==========================================================
    async function handleAddLiquidity() {
        const { ammContract } = getContracts(true);
        const inputA = dom.inputAAdd.value;
        const inputB = dom.inputBAdd.value;

        const numA = parseFloat(inputA);
        const numB = parseFloat(inputB);

        if (!ammContract || isNaN(numA) || isNaN(numB) || numA <= 0 || numB <= 0) {
            updateStatus("请输入有效的代币数量 (大于零)。", true);
            return;
        }

        updateStatus("正在添加流动性...");
        try {
            // 🚨 关键修复：确保浮点数转换成精确的字符串，防止出现科学计数法或精度损失
            const amountA_str = numA.toFixed(DECIMALS > 20 ? 20 : DECIMALS);
            const amountB_str = numB.toFixed(DECIMALS > 20 ? 20 : DECIMALS);

            const amountA_wei = ethers.parseUnits(amountA_str, DECIMALS);
            const amountB_wei = ethers.parseUnits(amountB_str, DECIMALS);

            console.log(`Debug: Token A Wei: ${amountA_wei.toString()}, Token B Wei: ${amountB_wei.toString()}`);

            const tx = await ammContract.addLiquidity(amountA_wei, amountB_wei);
            await tx.wait();

            updateStatus(`流动性添加成功! Tx Hash: ${tx.hash.substring(0, 10)}...`);
            fetchPoolData();
        } catch (error) {
            console.error("添加流动性失败:", error);

            let errorMessage = "添加流动性失败。";

            if (error.reason) {
                errorMessage += `**错误原因: ${error.reason}**`;
            } else if (error.message && error.message.includes("missing revert data")) {
                // 现在最常见的原因是未给新 AMM 地址授权
                errorMessage += "合约回退（无明确数据）。**请检查：1. 是否已为新的 AMM 地址重新授权 Token A/B 2. 钱包中是否有足够的余额。**";
            } else {
                 errorMessage += `请确保已重新授权，并拥有足够的代币余额。详细错误: ${error.message.substring(0, 50)}...`;
            }

            updateStatus(errorMessage, true);
        }
    }

    // 移除流动性
    async function handleRemoveLiquidity() {
        const { ammContract } = getContracts(true);
        const lpInput = dom.inputLPRemove.value;

        const numLP = parseFloat(lpInput);

        if (!ammContract || isNaN(numLP) || numLP <= 0) {
            updateStatus("请输入要移除的 LP 代币数量。", true);
            return;
        }

        updateStatus("正在移除流动性...");
        try {
            const lpAmount_str = numLP.toFixed(DECIMALS > 20 ? 20 : DECIMALS);
            const lpAmount_wei = ethers.parseUnits(lpAmount_str, DECIMALS);

            const tx = await ammContract.removeLiquidity(lpAmount_wei);
            await tx.wait();

            updateStatus(`流动性移除成功! Tx Hash: ${tx.hash.substring(0, 10)}...`);
            fetchPoolData();
        } catch (error) {
            console.error("移除流动性失败:", error);
            updateStatus("移除流动性失败。请确认 LP 代币余额充足。", true);
        }
    }

    // 兑换功能
    async function handleSwap() {
        const { ammContract } = getContracts(true);
        const amountIn = dom.inputSwap.value;
        const numIn = parseFloat(amountIn);

        if (!ammContract || isNaN(numIn) || numIn <= 0) {
            updateStatus("请输入有效的兑换数量。", true);
            return;
        }

        updateStatus("正在计算最小输出量...");
        const amountIn_str = numIn.toFixed(DECIMALS > 20 ? 20 : DECIMALS);
        const amountIn_wei = ethers.parseUnits(amountIn_str, DECIMALS);

        if (reserves.A === 0 || reserves.B === 0) {
            updateStatus("池子储备金为零，无法进行兑换。", true);
            return;
        }

        const reserveA_raw = ethers.parseUnits(reserves.A.toString(), DECIMALS);
        const reserveB_raw = ethers.parseUnits(reserves.B.toString(), DECIMALS);

        const reserveIn = isAtoB ? reserveA_raw : reserveB_raw;
        const reserveOut = isAtoB ? reserveB_raw : reserveA_raw;

        const FEE_NUMERATOR = 997n;
        const FEE_DENOMINATOR = 1000n;

        const amountIn_withFee = amountIn_wei * FEE_NUMERATOR / FEE_DENOMINATOR;

        const numerator = reserveOut * amountIn_withFee;
        const denominator = reserveIn + amountIn_withFee;

        const amountOut_wei = numerator / denominator;

        const minOut_wei = amountOut_wei * BigInt(Math.floor(SLIPPAGE_TOLERANCE * 10000)) / 10000n;

        updateStatus("正在发送兑换交易...");
        try {
            let tx;
            if (isAtoB) {
                tx = await ammContract.swapAforB(amountIn_wei, minOut_wei);
            } else {
                tx = await ammContract.swapBforA(amountIn_wei, minOut_wei);
            }

            await tx.wait();
            updateStatus(`兑换成功! 收到约 ${ethers.formatUnits(amountOut_wei, DECIMALS)} 个 Token ${isAtoB ? 'B' : 'A'}. Tx Hash: ${tx.hash.substring(0, 10)}...`);
            fetchPoolData();
        } catch (error) {
            console.error("兑换失败:", error);
            updateStatus("兑换失败。可能原因：滑点过大、余额不足、未授权。", true);
        }
    }

    // 4. 事件监听器
    dom.connectButton.addEventListener('click', connectWallet);

    // 确保授权是针对新的AMM合约地址
    dom.approveA.addEventListener('click', () => handleApprove(getContracts(true).tokenAContract, "Token A"));
    dom.approveB.addEventListener('click', () => handleApprove(getContracts(true).tokenBContract, "Token B"));

    dom.addLiquidityBtn.addEventListener('click', handleAddLiquidity);
    dom.removeLiquidityBtn.addEventListener('click', handleRemoveLiquidity);
    dom.executeSwapBtn.addEventListener('click', handleSwap);

    // 兑换方向切换
    dom.swapAtoBBtn.addEventListener('click', () => {
        isAtoB = true;
        dom.swapAtoBBtn.className = 'btn-active-direction';
        dom.swapBtoABtn.className = 'btn-direction';
        dom.executeSwapBtn.textContent = '执行兑换 (A → B)';
        dom.inputSwap.placeholder = '输入 Token A 数量';
    });
    dom.swapBtoABtn.addEventListener('click', () => {
        isAtoB = false;
        dom.swapAtoBBtn.className = 'btn-direction';
        dom.swapBtoABtn.className = 'btn-active-direction';
        dom.executeSwapBtn.textContent = '执行兑换 (B → A)';
        dom.inputSwap.placeholder = '输入 Token B 数量';
    });

    // 初始化时禁用所有功能按钮
    document.addEventListener('DOMContentLoaded', () => {
        setButtonsEnabled(false);
    });
</script>

</body>
</html>