event

anonymous: for events Does not store event signature as topic.
indexed: for event parameters Stores the parameter as topic.

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.6.0 <0.9.0;
import "hardhat/console.sol";

contract Event {
    event e1(int256);
    event e2(int256)anonymous;//在topic中不输出
    event e3(int256 indexed);//参数在topic中输出
    constructor(){   
        emit e1(1);  
        emit e2(2);
        emit e3(3);
    }
}