cos.restoreObject({
    Bucket: 'examplebucket-1250000000', /* Your bucket (required) */
    Region: 'COS_REGION',  /* Bucket region (required), such as ap-beijing */
    Key: '1.jpg',  /* Object key stored in the bucket (required), such as `1.jpg` and `a/b/test.txt`. */
    RestoreRequest: {
        Days: 1,
        CASJobParameters: {
            Tier: 'Expedited'
        }
    },
}, function(err, data) {
    console.log(err || data);
});

function(err, data) { ... }