// 错误信息如下:
xxx.sol:3:1: ParserError: Source file requires different compiler version (current compiler is 0.6.10-develop.2020.9.21+commit.facc8743.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version pragma solidity ^0.6.10; ^----------------------^
// 合约文件开头部分
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.10