function getUrl(params) {
    var longBucket = params.bucket;
    var shortBucket = longBucket.substr(0, longBucket.lastIndexOf('-'));
    var appId = longBucket.substr(longBucket.lastIndexOf('-') + 1);
    var domain = params.domain;
    var region = params.region;
    var object = params.object;
    var protocol = params.protocol || (util.isBrowser && location.protocol === 'http:' ? 'http:' : 'https:');
    if (!domain) {
        if (['cn-south', 'cn-south-2', 'cn-north', 'cn-east', 'cn-southwest', 'sg'].indexOf(region) > -1) {
            domain = '{Region}.myqcloud.com';
        } else {
            domain = 'cos.{Region}.myqcloud.com';
        }
        if (!params.ForcePathStyle) {
            domain = '{Bucket}.' + domain;
        }
    }
    domain = domain.replace(/\{\{AppId\}\}/ig, appId)
        .replace(/\{\{Bucket\}\}/ig, shortBucket)
        .replace(/\{\{Region\}\}/ig, region)
        .replace(/\{\{.*?\}\}/ig, '');
    domain = domain.replace(/\{AppId\}/ig, appId)
        .replace(/\{BucketName\}/ig, shortBucket)
        .replace(/\{Bucket\}/ig, longBucket)
        .replace(/\{Region\}/ig, region)
        .replace(/\{.*?\}/ig, '');
    if (!/^[a-zA-Z]+:\/\//.test(domain)) {
        domain = protocol + '//' + domain;
    }

    // 去掉域名最后的斜杆
    if (domain.slice(-1) === '/') {
        domain = domain.slice(0, -1);
    }
    var url = domain;

    if (params.ForcePathStyle) {
        url += '/' + longBucket;
    }
    url += '/';
    if (object) {
        url += util.camSafeUrlEncode(object).replace(/%2F/g, '/');
    }

    if (params.isLocation) {
        url = url.replace(/^https?:\/\//, '');
    }
    return url;
}