solidity string 转成 uint

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.12;

contract Test {
  function stringToUint(string memory s) public pure returns(uint) {
    bytes memory b = bytes(s);
    uint result = 0;
    for(uint i = 0; i < b.length; i++) {
      if(uint8(b[i]) >= 48 && uint8(b[i]) <= 57) {
        result = result * 10 + (uint8(b[i]) - 48);
      }
    }
    return result;
  }
}

来源：oschina

链接：https://my.oschina.net/Rhynie/blog/4943905