Ethereum 标识符未找到或不唯一？

我制作了一个solidity合约，当我编译它时，我得到了以下错误：“DeclarationError:找不到标识符或标识符不唯一。-->Token.sol:20:59:| 20 |函数平衡（地址所有者）公共视图返回（单位）{^^^^^^这是怎么回事

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;

contract Token { 
    mapping(address => uint) public balances;
    mapping(address => mapping(address => uint)) public allowance;
    
    uint public totalSupply = 1000000 * 10 ** 18;
    string public name = "Mebium";
    string public symbol = "MEB";
    uint public decimals = 18;
    
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval (address indexed owner, address indexed spender, uint value);
    
    constructor() {
        balances[msg.sender] = totalSupply;
    }
    
    function balanceOf(address owner) public view returns(unit) {
        return balances[owmer];
    }
    
    function transfer(address to, uint value) public returns(bool) {
        require(balanceOf(msg.sender) >= value, 'balance too low');
        balances[to] += value;
        balances[msg.sender] -= value;
        emit Transfer(msg.sender, to, value);
        return true;
    }
    
    function transferFrom(address from, address to, uint value) public returns(bool) {
        require(balanceOf(from) >= value, 'balance too low');
        require(allowance[from][msg.sender] >= value, 'allowance too low');
        balances[to] += value;
        balances[from] -= value;
        emit Transfer(from, to, value);
        return true;
        
    }
    
    function approve(address spender, uint value) public returns(bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }
}

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这是由您的代码输入错误引起的。返回类型应为

uint

（无符号整数），而不是

单位

函数中还有一个输入错误-应该是

owner

，是

owmer

function balanceOf(address owner) public view returns(uint) {
    return balances[owner];
}

---

我现在得到了前一行的错误。当我用这个函数替换你原来的

balanceOf

函数时，我得到了成功的编译。你能编辑你的问题并显示导致错误的新代码吗？函数balanceOf（address owner）public view returns（unit）{return balances[owner]；}函数传输（地址到，uint值）公共返回（bool）{require（balanceOf（msg.sender）>=value，‘余额过低’；balances[to]+=value；balances[msg.sender]-=value；emit传输（msg.sender，to，value）；返回true；}注释中的代码示例包含不正确的

单元

，而不是

uint

。您需要将其替换为正确的语句。