47、以太坊代币标准与ERC-20代币构建全解析

以太坊代币标准与ERC-20代币构建全解析

1. 代币创建与标准化需求

随着以太坊等智能合约平台的出现，使用智能合约创建代币变得十分容易。技术上，只需几行代码就能在以太坊上创建代币，示例代码如下：

pragma solidity ^0.8.0;
contract token { 
    mapping (address => uint) public coinBalanceOf;
    event CoinTransfer(address sender, address receiver, uint amount);

  /* Initializes contract with initial supply tokens to the creator of the 
contract */
  function  tokenx(uint supply) public {
        supply = 1000;
        coinBalanceOf[msg.sender] = supply;
    }
  /* Very simple trade function */
    function sendCoin(address receiver, uint amount) public returns(bool 
sufficient) {
        if (coinBalanceOf[msg.sender] < amount) return false;
        coinBalanceOf[msg.sender] -= amount;
        coinBalanceOf[rece