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javascript - 从智能合约调用方法而不签署交易

问题描述

我需要使用我的应用程序从我的智能合约中调用 balance 函数，并且我不想使用 metamask 和其他 web3 提供程序，因为我不会发送任何交易并且不需要仅使用公共钱包 ID

它在 localHost 上运行良好，但在以太坊主网上却失败了

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Balance Checker</title>
    <script src="./node_modules/web3/dist/web3.min.js"></script>
</head>
<body>
    <h1 id="display"></h1>
    <input id="wallet_add" type="text">
    <button id="button">Check Balance</button> 
    <input id="amount" type="number">
    <button id="withdraw">Withdraw Tokens</button>
    <h1 id = "status"></h1>

    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
    <script>
    if(typeof web3 !== 'undefined') {

        web3 = new Web3(web3.currentProvider);

    } else {

        web3 = new Web3(new Web3.providers.HttpProvider("https://mainnet.infura.io/v3/71cda5338d4440fa9cd615a82b829d47"));
    }

    var P1Contract =  web3.eth.contract([{"constant":false,"inputs":[],"name":"end_ICO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_amount","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"releaseICO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"total_Supply","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ico_startdate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"StopICO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"start_PREICO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"_price_tokn","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pre_startdate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"start_ICO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"ico_enddate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_totalsupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"stage","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"pre_enddate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]);

    var P1 = P1Contract.at('0x080eB7238031F97Ff011e273D6CaD5ad0c2dE532');

    console.log(P1);

    $("#button").click(function(){

        var ame  = P1.balanceOf($('#wallet_add').val());            

        var name  = ame.toNumber();        

        var balanc = name/100000000;

        console.log(balanc);

        $("#display").html(balanc);

        var symb   = P1.symbol("");

        console.log(symb);

        var nam = P1.name("");

        console.log(nam);
    });

    </script>

</body>
</html>

合约地址：https ://etherscan.io/address/0x080eb7238031f97ff011e273d6cad5ad0c2de532#code

我需要从 web3 调用 balance 函数

错误：

错误：MetaMask Web3 对象不支持没有回调参数的同步方法，例如 eth_call

标签： javascriptcallbackweb3

解决方案

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