为什么 msg.sender 有部署者的地址（地址不是调用者）

Question

I'm currently developing on a simple Naming Service for the Ethereum Blockchain. msg.sender has the address of the deployer from the contract and not from the caller.

    address public caller;

      constructor() {
      caller = msg.sender;
   }

Using remix.ethereum.org and pragma solidity >=0.7.0 <0.9.0; and deployed on the JavaScript VM (London).

Can someone explain me why?

Answer 1

Right now caller is going to be equal to the address that deployed the contract because that is what msg.sender will reference. If you are trying to make caller be the contract address instead, then you need to do caller = address(this); . address(this) is the actual contracts address.