字符串使用 “”或’’表示.

字符串基本使用

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pragma solidity ^0.8.0;

contract StringDemo{
    string _name;

    constructor(string memory name) {
        _name = name;
    }

    function setName(string memory name) public {
        _name = name;
    }

    function getName() view public returns (string memory){
        return _name;
    }
}

字符串的比较

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pragma solidity ^0.8.0;

contract StringDemo{
  
    //...

    function compareString(string memory str1,string memory str2) pure public returns(bool){
        return keccak256(abi.encodePacked(str1))==keccak256(abi.encodePacked(str2));
    }
}

字符串的合并

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pragma solidity ^0.8.0;

contract StringDemo{

    //...

    function join1(string memory str1,string memory str2) pure public returns(bytes memory){
        return abi.encodePacked(str1,str2);
    }

    function join2(string memory str1,string memory str2) pure public returns(string memory){
        return string(abi.encodePacked(str1,str2));
    }
}