javascript - 尝试使用 try 和 catch 来确定条件

Question

我有一个检查版本的方法。现在，如果文件版本不存在，我想通过 try and catch 显示此错误

我正在尝试这样做，但不知道这是否好

  public checkVersionFile(): any {
    const contentVersion = fs.readFileSync( "Version", 'utf8')

    try{
        if(contentVersion.endsWith('-SNAPSHOT')){
            let match = /^(\d+)\.(\d+)\.(\d+)-(\d+)-(SNAPSHOT)$/.exec(contentVersion);
            const version =  (parseInt(match[1])) + '.' + (parseInt(match[2])) + '.' + (parseInt(match[3])) + '-' + (parseInt(match[4]));
            return version
        }
        else {
            logger.error("Cannot be released without SNAPSHOT inside Version file in components");
        }
    }
    catch (err) {
        return Promise.reject("file Version doesn't exist");
    }

}

感谢您的帮助:)

Answer 1

文件读取操作不在 try/catch block 内，因此无法捕获此错误。

  public checkVersionFile(): any {


    try {
        const contentVersion = fs.readFileSync( "Version", 'utf8')

        if(contentVersion.endsWith('-SNAPSHOT')){
            let match = /^(\d+)\.(\d+)\.(\d+)-(\d+)-(SNAPSHOT)$/.exec(contentVersion);
            const version =  (parseInt(match[1])) + '.' + (parseInt(match[2])) + '.' + (parseInt(match[3])) + '-' + (parseInt(match[4]));
            return version
        }
        else {
            logger.error("Cannot be released without SNAPSHOT inside Version file in components");
        }
    }
    catch (err) {
        return Promise.reject("file Version doesn't exist");
    }

}