标准erc20合约。
想从前端调用一个地址的币的余额，web3JS 如下做了合约实例化和方法调用：
```
var tokenInstance = new web3js.eth.Contract(tokenABI,"0x6721A1802768D82Df3C113275A4286d6FfCa940E");
tokenInstance.methods.balanceOf("0xCC52C6dF34126e9A00D057663...
... }
}
pragma solidity ^0.6.2;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Retur...
最近我的eth 执行erc20 token授权转账 提交广播后，变成一直处于pending状态。查看交易hash。页面提示 This txn hash was found in our secondary node and should be picked up by our indexer in a short while。
以下是我在 ***goerli*** 测试网的交易截图。
...
... uint256 amount
) private {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
console.log(from,to,amount);
console.log('inSwapAndLiquify',inSwapAndLiquify);
c...
...twitter.com/myisland_dao?s=21
*/
pragma solidity ^0.8.4;
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
```
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf...