纯新人）对c/c++还不够熟悉，当我尝试用洛谷在线ide运行js时

console.log("Hello, world!");

internal/modules/esm/get_format.js:65
        throw new ERR_UNKNOWN_FILE_EXTENSION(ext, fileURLToPath(url));
        ^

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension "" for /tmp/compiler_kbkrb4pm/src
    at defaultGetFormat (internal/modules/esm/get_format.js:65:15)
    at checkSyntax (internal/main/check_syntax.js:57:24)
    at internal/main/check_syntax.js:39:3 {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

（我知道这无关紧要，没人拿js解算法题罢

（另外，用文言hack可以成功地把js代码hack进去：

注曰*/
console.log("Hello, world!");
/*