有没有办法使用aws-sdk获取已删除的s3对象的先前版本？

可以通过3个步骤完成：

1. 使用listObjectVersions获取版本列表
2. 从列表中获取所需版本
3. 获取特定对象，将VersionId作为参数传递给getObject

const AWS = require('aws-sdk');
const s3 = new AWS.S3();

async function getDeletedObject (event, context) {

    let params = {
        Bucket: 'my-bucket',
        Prefix: 'my-file'
    };


    try {
        const previousVersion =  await s3.listObjectVersions(params)
            .promise()
            .then(result => {
                const versions = result.Versions;
                // get previous versionId
                return versions[0].VersionId;
             });

         params = {
              Bucket: 'my-bucket',
              Key: 'my-file',
              VersionId: previousVersion
         };

         const deletedObject = await s3.getObject(params)
             .promise()
             .then(response => response.Body.toString('utf8'));

         return deletedObject;
    }

    catch (error) {
        console.log(error);
        return;
    }

}