Magento free工作

筛选

我最近的搜索
筛选项:
预算
类型
技能
语言
    工作状态
    2,000 magento free 份搜到的工作,货币单位为 USD
    free 兀 project 已经结束 left

    帮助自由客寻找匹配的新型项目网站,针对新星互联网项目寻找优秀制作人

    $7 / hr (Avg Bid)
    $7 / hr 平均报价
    1 个竞标

    magento mysql查询量很大,cpu负载超过 1000%

    $68 (Avg Bid)
    $68 平均报价
    6 个竞标
    magento 网站 已经结束 left

    我想建一个简洁的MAGENTO网站,主要用于快速展示商品价格,页面设计已经完成·。

    $1249 (Avg Bid)
    $1249 平均报价
    11 个竞标
    Project for Tong D. 已经结束 left

    我要做个magento 2网站,你有微信不,

    $11 (Avg Bid)
    $11 平均报价
    1 个竞标
    Magento 2 二次开发 已经结束 left

    Magento 2 二次开法一个和这个网站一样的网站,界面和功能一样

    $217 (Avg Bid)
    $217 平均报价
    11 个竞标

    开发麦进斗都多商户模式,前端后端开发,手机端电脑端,部分以买插件,只需要对商城进行再次改造,符合国内用户习惯,和淘宝差不多,但是不需要那么强大功能,只需要小规模,大部分已有插件,开发二手商城,社区等,物流再次开发可QQ联系我939808262请备注

    $4379 (Avg Bid)
    $4379 平均报价
    6 个竞标

    magento搭建一个购物系统,网站框架会有具体要求,非简单套用模板。其中最主要的是包含一个DIY自助设计系统,用户可以在线选择现在的图案或都上传自己的图片,简单编辑,形成成品,要求有比较真实的预览效果,非简单贴图。最后结合magento在线下单。 参考DIY系统 语言:javascript,HTML5, PHP 希望有此方面经验的高手联系,没有经验的请勿扰。谢谢!!

    $2155 (Avg Bid)
    $2155 平均报价
    8 个竞标
    创建网站 已经结束 left

    可用magento制作一个商城网站及后期一些维护修改。后期还有考虑用wordpress做b2b的网站。

    $195 (Avg Bid)
    $195 平均报价
    6 个竞标

    新网站销售石头珠子为主还有一些时尚珠宝首饰。以后会增加主域名。网站为magento系统。 你需要做前期SEO,布置每个目录的meta keyword等信息,完善SEO。方便后期的google 广告建设。聊得好,后期的google广告也给你做。

    $74 (Avg Bid)
    加精 加急
    $74 平均报价
    6 个竞标

    我有进行中的、与之前的项目相关的工作Magento Minor Issues Fix'

    $12 / hr (Avg Bid)
    $12 / hr 平均报价
    1 个竞标

    我有进行中的、与之前的项目相关的工作Solve the Magento E-mail Sending Failure Problem'

    $6 / hr (Avg Bid)
    $6 / hr 平均报价
    1 个竞标
    magento 建站 已经结束 left

    magento 建站 magento 二次开发 数据库备份,维护 网站安全维护

    $194 (Avg Bid)
    $194 平均报价
    4 个竞标
    创建网站 已经结束 left

    magento 模版,汉化 并且能够根据客户的要求修改模版模块。

    $1707 (Avg Bid)
    $1707 平均报价
    5 个竞标
    Magento自适应网站 已经结束 left

    我们是一家餐厅食材供应平台(餐饮食材供应链管理) 1.自适应 2.符合中国人购物习惯 3.微信登陆,QQ登陆,支付宝或淘宝登陆 4.微信支付,支付宝支付 5.报表定制 主要流程: 1-餐厅每晚24:00前通过我们的微店或者网站下订单, 2-系统把每家订单统一分类汇总(白菜 1+2+3+5+50;土豆:100+40+30+10+20;猪肉:2+3+5+7+10) 3-在系统做一下记录这个订单前期我们系统有个叫做采购的用户能够直接看到每天系统自动生成的采购单,由采购根据加入系统的供应商信息和报价去供应商处采购,或者由系统自动将采购单发送给相应品类的供应商 4-系统根据客户信息和车辆运载能力自动设计或人工干预设计物流配送线路 4-供应商根据我们的采购需求为我们供货 5-货物入库,由分拣员根据分配到的分拣订单开始分拣,打包,贴标 6-验货员验货后扫码装车,由第三方物流根据我们系统设计的物流配送路线统一配送 7-餐厅验货录入实际收货数量,涉及到退货和补货的问题,餐厅根据该数量和我们公司结算,我们公司也根据该收货数量和供应商结算 8-物流配送车辆返回仓库,交接收货单单据和退换货

    $2777 (Avg Bid)
    $2777 平均报价
    4 个竞标

    制作一个英文版外贸电子商务网站 开发语言:php或者magento zencart二次开发 参考网站: 具体要求: 1、功能模块: 前台功能:产品管理系统, 搜索系统,购物车功能,支付系统,订单管理系统,会员管理系统,邮件系统,上传下载系统,价格计算系统,返利销售佣金系统,QA功能,产品评价系统 后台功能:会员管理系统;新闻、信息、广告发布系统;页面访问 统计;Tickets功能;站内信息检索系统...... 2、网站维护: 服务商需要提供后期维护支持及网站后台功能培训 3、仅制作英文版,可以参考,除秒杀和团购,论坛功能外,其它功能都要。 4、其他要求: 必须有过使用zencart magento 或者php语言开发过英文版外贸电商网站的实际案例。 工期约三个月内,能承诺最后不能完成的可以退回全部费用的。需要能提供制作周报以便跟踪进度 有能制作的公司请联系我,站内短信或者在下面回复邮箱都可以。 运行平台:PC端 已经有整理详细的需求文档,可以联系详谈。 服务商:深圳当地的优先,必须是有相关开发经验的服务商。 赏金可以沟通。 我的QQ20969265

    $5065 (Avg Bid)
    $5065 平均报价
    4 个竞标

    电商网站已经建好,运行一年,现需要后台添加一些功能,必须熟悉MAGENTO 和M2E 具体要实现功能包括 网页页面简单修改 后台ORDER 导出 移服务器 一些插件的安装和调试 熟悉MAGENTO和M2E都可以联系我,网站需要长期的技术支持,有可能会保持长期持续合作

    $250 - $750
    $250 - $750
    0 个竞标
    magento 主题修改 已经结束 left

    一个magento的项目,已经建立主题,按照客户需求进行修改。

    $227 (Avg Bid)
    $227 平均报价
    8 个竞标

    我们需要对比评估电商系统帮助我们的网店、微信商城、以及未来20个门店展开业务。需要你对比ShopEX, ECShop, V5Shop,Magento,HiSjop, IBM Websphere Commerce, Oracle 等等方案的性价比。这个价格, 是长期成本TCO.

    $10 - $30
    $10 - $30
    0 个竞标

    我的網頁是用MAGENTO編寫的, 接近完成的階段, 但有以下事項需要完成 (詳情請參考附件PDF.): 1) 改PAGE LINK 2) 小量版面修改 3) 我網頁有一個FLASH的試衣程式, 需要導入網頁和輸出XML數據同步.(我的試衣程式設計員會給你指引怎樣去完成工作.) 如有任何問題請與我聯繫.

    $193 (Avg Bid)
    $193 平均报价
    2 个竞标

    我有一个持续工作,之前与之相关的项目为'Ultimo theme customization (magento)'

    $10 / hr (Avg Bid)
    $10 / hr 平均报价
    1 个竞标
    Free test 已经结束 left

    林毅夫:中国经济今年会保持7.5%至8%增长 全国工商联副主席、北大国家发展研究院名誉院长林毅夫13日在欧美同学会100周年北京论坛上表示,中国经济不会硬着陆,并将在四季度止跌回升,今年会保持7.5%至8%的增长,与发达国家复苏缓慢相比,中国经济风景这边独好。林毅夫说,“近年来,国际上有很多唱衰中国经济的观点,认为中国经济在今年或是未来一段时间将出现硬着

    $10 - $30
    $10 - $30
    0 个竞标
    Magento 仿站 已经结束 left

    Magento仿站,要求有Magento 2年以上开发经验的团队介入,团队中美工、UI、前端、开发、SEO、DBA什么的都要具备,可兼任,但一定要求是高手,能力一般者请勿打扰。具体需要模仿的网站本处不便公开,请直接Q我 5732730,工作内容详谈。

    $1500 - $3000
    $1500 - $3000
    0 个竞标

    We are seeking an experienced freelancer to resolve a Varnish issue on our Magento staging site. The task requires immediate attention and the ability to work via AnyDesk to troubleshoot and fix the issue efficiently. Key Requirements: Proficient in Varnish configuration and troubleshooting. Expertise in Magento platform and server management. Ability to work via AnyDesk for immediate assistance. Ensure that the live site hosted on the same server remains unaffected during the troubleshooting process. Important Note: Only apply if you are confident in your ability to handle this task professionally and ensure that the live site remains operational without any disruptions. The selected freelancer must be available to start immediately and commit to resolvin...

    $35 (Avg Bid)
    $35 平均报价
    2 个竞标

    I'm looking for an experienced Magento 2 developer to resolve an issue with a broken link on my website. - The problem lies with a 404 error that appears when a checkout link is clicked. - Rather than seeing this error, I wish for users to be redirected smoothly to the correct checkout page, which exists. - Strong understanding of Magento 2, as well as experience in troubleshooting and resolving link issues, are necessary for this task. Your task will involve identifying and fixing the broken link, ensuring it correctly redirects to the appropriate checkout page. Your expertise in Magento 2 will be crucial to the successful and efficient completion of this project.

    $13 (Avg Bid)
    $13 平均报价
    12 个竞标

    ...a Multi-Vendor E-commerce Marketplace using Magento. This marketplace is specially intended for the Indian market. A variety of goods, including but not limited to Electronics, Gadgets, Apparel, Accessories, Home and Kitchen items, will be sold on this platform. Key Features: - Product search functionalities and filters for easy navigation - User reviews and ratings system for transparent shopping experience - Order tracking option for buyers' convenience - Dedicated store pages for each vendor to showcase their products - Compatibility to shopping in India - Implementation of UPI payments for secure transactions - Mobile-friendly design for easy access on smartphones and tablets Ideal freelancer will: - Have considerable experience in Magento platform and e-commer...

    $384 (Avg Bid)
    $384 平均报价
    31 个竞标

    My Magento website is currently down due to a critical error. This error was showing for a short time on the screen: "Exception: Notice: fwrite(): write of 211 bytes failed with errno=28 No space left on device in /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/ on line 133 in /var/www/html/vendor/magento/framework/App/ Stack trace: #0 [internal function]: MagentoFrameworkAppErrorHandler->handler() #1 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/(133): fwrite() #2 /var/www/html/vendor/monolog/monolog/src/Monolog/Handler/(119): MonologHandlerStreamHandler->streamWrite() #3 /var/www/html/vendor/magento/framework/Logger/Handler/(88): MonologHandlerStreamHandler->write() #4 /var/www/htm

    $118 (Avg Bid)
    $118 平均报价
    33 个竞标

    I'm looking for a BigCommerce developer to complete the migration of my Magento site. The majority of the site's structure is already in place, but your key role would be to develop: - Configurable Products - Bundle Products Additionally, my BigCommerce store needs to have Product Customization Options added. The desired feature for customization is: - Choice-based customizations: drop-downs or radio buttons Ideal candidates will have a deep understanding of different product types and how to effectively implement them within BigCommerce. Understanding of choice-based customization options is a must for this role. Our product options have cascading drop down selections that are dependent on previous selections. There are also other tasks that will be required to compl...

    min $32 / hr
    加封 保密协议
    min $32 / hr
    50 个竞标

    FEATURES /FUNCTIONALITY Web responsive and no app should be required. Site should display correctly on all mobile devices. • Use PH7 Builder, free opensource dating-site software. I will not be using all available features, but you can see the capabilities and features here: • Implement my custom Algorithm to calculate matches based on selected filters • Require Chat messaging • Modify software to allow user to record audio and send as message or leave as bio • Profile pic can only come from user camera, not gallery or pasting • Require Match alert notifications • User should be able to exclude matches based on any particular filter/option • PH7 BUILDER Software can

    $1165 (Avg Bid)
    $1165 平均报价
    104 个竞标

    I have a magento webstore running on magento 2.3.4. I want to update it to the latest version with all patches, while maintaining current customers/database/products. I also want usps first class mail parcel/usps ground advantage to show up again as a shipping method.

    $196 (Avg Bid)
    $196 平均报价
    27 个竞标

    I'm in need of a software or bot that can automatically remove copyright from a football transmission. Here's a bit more about what I'm looking for: - **Bypass Copyrights**: The software should be designed to remove copyright from the live football transmission by making necessary changes to the images and video. This entails bypas...field of copyright removal or video streaming. - Familiarity with live streaming platforms and processes. - Strong problem-solving abilities to create an efficient and effective solution for bypassing copyright in real-time. If you have a background in copyright law or experience with similar projects, that would be a plus. The ultimate goal is to ensure the live football transmission is copyright-free and can be shared on my YouTube ch...

    $167 (Avg Bid)
    $167 平均报价
    28 个竞标

    Seeking a freelancer to revamp a WordPress webshop plagued by malware. Priority on simplicity in design, ensuring fast loading and security. Need existing products migrated to the new version seamlessly. Requirements: Malware removal & security enhancement Simple, elegant design Optimize for speed Seamless product migration WordPress expertise Timeline & Budget: Please propose timeline and budget. Previous WordPress experience required. If you're ready to tackle this project efficiently and deliver a sleek, secure WordPress webshop, send your proposal with relevant experience. Let's revamp this shop together!

    $162 (Avg Bid)
    $162 平均报价
    174 个竞标

    ...strategist to assist in the expansion of a Facebook group focused on sharing free furniture items across the USA. The aim is to quickly reach a total of 10,000 members. The successful freelancer will use organic outreach strategies to promote the group to our target audience, homeowners across America. Specific projects may include setting up collaborations with other Facebook groups or online communities and creating engaging, sharable content. Ideal skills and experience: - Expertise in Facebook group management and growth strategies - Strong understanding of organic outreach techniques - Excellent content creation and curation abilities - Prior experience appealing to homeowners and individuals interested in free, primarily furniture items. This is your chanc...

    $173 (Avg Bid)
    $173 平均报价
    30 个竞标

    I am in need of a freelancer who can help me extend free lotto club memberships to individuals in the UK. The project is primarily focused on leveraging social media platforms for advertisements. Requirements and Expectations: - I work with affiliates who will engage in social media advertising. Your role will be to oversee and optimize this process. - The social media platforms for advertising are flexible. You can choose the most effective ones based on the audience and user engagement. - The target audience for this campaign includes adults aged 18-24, 25-34, and 35-44. Ideal Skills and Experience: - Proven experience in social media advertising. - Ability to tailor campaigns to different target audiences. - Previous work in the UK market is a plus.

    $27 / hr (Avg Bid)
    加精
    $27 / hr 平均报价
    15 个竞标

    ...Harshit Sharma, hereinafter referred to as "Developer". WHEREAS, Client desires to have a website developed on the Magento 2 platform, and Developer desires to provide such services. NOW, THEREFORE, in consideration of the mutual covenants contained herein, the parties agree as follows: 1. Services Developer agrees to provide the following services for the Client's website: Magento 2 Site Backups: Regularly upload backups of the Magento 2 website to a test server. Feature Development: Develop any new features requested by the Client. Design Changes: Implement any design changes requested by the Client. Magento 2 Upgrades: Perform upgrades to the latest versions of Magento 2. ERP Sync Module: Develop a custom ERP synchronization modul...

    $506 (Avg Bid)
    $506 平均报价
    21 个竞标

    ...Harshit Sharma, hereinafter referred to as "Developer". WHEREAS, Client desires to have a website developed on the Magento 2 platform, and Developer desires to provide such services. NOW, THEREFORE, in consideration of the mutual covenants contained herein, the parties agree as follows: 1. Services Developer agrees to provide the following services for the Client's website: Magento 2 Site Backups: Regularly upload backups of the Magento 2 website to a test server. Feature Development: Develop any new features requested by the Client. Design Changes: Implement any design changes requested by the Client. Magento 2 Upgrades: Perform upgrades to the latest versions of Magento 2. ERP Sync Module: Develop a custom ERP synchronization modul...

    $571 (Avg Bid)
    $571 平均报价
    114 个竞标

    I'm seeking a seasoned freelancer to upgrade my Magento 2.3.1 website to a stable & supported version. The task requires not only the version upgrade, but also ensuring that all existing customizations are well-integrated post-upgrade - preserving their functionality as conceived and constructed. Key Customizations To Be Maintained: - Theme modifications - Extensions integration - Custom modules development Ideal Qualifications: - Experienced in both frontend and backend development - Past experience in similar projects is a strong recommendation. Applicants are encouraged to bolster their proposals with proven instances of their experience. This will greatly assist my selection process. Proficiency in backend and frontend development skills is a firm pre-requisite, as ...

    $2381 (Avg Bid)
    $2381 平均报价
    92 个竞标

    As a Magento based business owner, I'm looking to significantly enhance the loading times of my website's pages. Key Project Goals: - Minimize the load time of my website's pages which are currently exceeding 4 seconds. After improvements, I'd like the pages to load as quickly as possible. - Specifically focus on optimizing the Product, Checkout, and Category pages as I'm facing the most loading time issues there. To achieve the above-mentioned goals, it is important to optimize the three crucial aspects of the website: - Image optimization – Utilize appropriate compression techniques for optimized image sizing. - Caching Improvements – Enhance the caching mechanisms to make the website extremely responsive. - Code minification –...

    $515 (Avg Bid)
    $515 平均报价
    121 个竞标

    I need a paper written for a graduate-level course on a topic of my choosing. The catch? The paper can not contain any AI-generated text and must sound entirely human-written. Ideal Skills and Experience: - Proficient in Graduate-Level Academic Writing: The freelancer should have a strong background in the kind of writing expected at a graduate level. - Excellent Writing Skills: The writer should be able to craft a high-quality paper that appears to be human-written. - Understanding of Citation Styles: As I would like the paper to be formatted in Chicago style, the freelancer should be familiar with this citation style. The word count should be at least 1000 words and should be able to pass iThenticate AI Detetcion.

    $77 (Avg Bid)
    保密协议
    $77 平均报价
    16 个竞标

    I'm in need of a skilled developer to create payment plugins for my own payment gateway GabbiPay (documentation: ) compatible with Woocommerce, Magento, and OpenCart. The plugins should have advanced functionality and ensure secure payment processing.

    $193 (Avg Bid)
    $193 平均报价
    109 个竞标
    Set New Relic to Magento 2 4 天 left
    已验证

    I have al old account of New Relic, I would like to enable again but looking for anybody able to explain me how.

    $25 (Avg Bid)
    $25 平均报价
    25 个竞标

    **Job Title: Freelance DevOps Engineer** **Location: Remote** **Job Type: Freelance** **Introduction:** We are seeking a highly skilled and experienced Freelance DevOps Engineer to join our dynamic team. This role is ideal for someone passionate about automating and improving development and production environments, and freeing up developers from the complexities of DevOps tasks. Your expertise in AWS, containerization, orchestration, continuous integration, and continuous deployment will be pivotal in our operations. **Key Responsibilities:** - Design, implement, and manage CI/CD processes and pipelines. - Deploy, automate, maintain, and manage AWS cloud-based production systems to ensure availability, performance, scalability, and security. - Problem solve and troubleshoot production iss...

    $35 / hr (Avg Bid)
    $35 / hr 平均报价
    73 个竞标

    I am looking for a Magento 2 developer who can help me fix a specific cron job error I've been experiencing. The error states "SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'entity_id' in". Ideal Skills and Experience: - Proven experience with Magento 2 development - Strong understanding of cron jobs and how they work within Magento 2 - Familiarity with debugging and resolving SQL integrity constraint violations Please note that the specific table causing the error was not identified. Your expertise in this area will be crucial. I am using Magento 2.4.6-p4 CE and I get the following error after every order. The job indexer_update_all_views scheduled at 2024-04-15 10:31:03 failed with the following error message: SQLSTA...

    $33 (Avg Bid)
    $33 平均报价
    52 个竞标

    Hello, I am looking for someone able to navigate to my website as user and check if there is any issue to fix/improve. You have to search products, place an order, change language and collec informations in a report. Thank you Aldo

    $158 (Avg Bid)
    $158 平均报价
    34 个竞标

    I'm facing a fatal error in my Magento system's on line 1928. This happens particularly when I'm trying to import items using the Forebear Extension. Alongside, I've also been noticing a series of error messages or codes when I'm using this extension. Ideally, I'm looking for someone with the following skills and experiences: - Expertise in Magento and its inner-workings - Proficient in debugging fatal errors in PHP scripts - Familiarity with Forebear Extension for Magento. Must be able to interpret, diagnose, and fix error messages and codes encountered during its use. Your task would be not just to fix this one instance of fatal error but to make sure it doesn't reoccur in the future while using the extension.

    $55 (Avg Bid)
    $55 平均报价
    32 个竞标

    I'm looking for a Python expert who can develop a script that can take an image URL as input and return the OCR text response. The purpose is to extract numbers with a minimum of 4 digits from images, using only Free OCR tools. The desired output should be a JSON object. The script must support the JPEG and PNG formats. It's unclear how many digits the numbers in the images could have, so the code should be robust enough to handle variable digit lengths. Experience in optical character recognition (OCR) and handling JSON objects are crucial for this project. Specific requirements: - Python coding experience - Knowledge in OCR - Proficiency in handling JPEG and PNG formats - Experience in managing JSON objects Please see the attached images for a better understanding o...

    $102 (Avg Bid)
    $102 平均报价
    34 个竞标

    I'm facing multiple issues with my Magento site that I need addressed by a skilled Magento developer. The main identified issue is with the color selection option on the checkout page which is not displaying correctly. Sadly, the color selection feature isn't just flawed; it seems to be non-existent at the moment. To successfully complete this project, you will: - Diagnose the main reasons for this flaw within the software - Fix the color selection option on the checkout page - Ensure all product images display correctly - Resolve any URL redirect issues that may exist - Carry out a general check for additional bugs, especially in the checkout process Proven experience with Magento development, including a strong understanding of its framework, extensions, ...

    $77 (Avg Bid)
    $77 平均报价
    17 个竞标

    I am seeking a skilled and creative website developer who can help me build my e-commerce platform. Seeing as I've not specified a preferred platform, the ideal candidate would be someone with vast experience in available platforms (Shopify, WooCommerce, Magento) so they can give me professional insights on creating my own space. Skills required: - Advanced website development - Understanding of modern e-commerce platforms (Shopify, WooCommerce, Magento) - Good communication for giving constructive suggestions concerning platforms Project Timeline: As I have not set a particular deadline, I am looking for someone who can adopt an in-depth approach to fully capture my requirements and produce a high-quality outcome. It is essential that the freelancer values quality o...

    $111 (Avg Bid)
    $111 平均报价
    43 个竞标

    I am seeking a talented and creative writer to construct a beautiful 10-20 line free verse poem centered around the theme of love. This unique piece should deeply express human emotions, tell a compelling story, and truly capture the essence of romantic love. Ideal Skills: - Excellent command of the English language - Deep understanding of free verse poetry - Ability to convey emotions powerfully - Experienced in writing love-themed prose This job requires a perfect blend of creativity and writing skills. If you have a passion for writing and a knack for capturing hearts with your words, I'd be delighted to work with you.

    $233 (Avg Bid)
    $233 平均报价
    27 个竞标

    I need assistance with an urgent issue on my Magento 2 e-commerce site. Specifically, we have recently been encountering a 500 Internal Server Error and require an experienced Magento developer to diagnose and rectify this problem. This task will ideally require: - In-depth understanding and expertise in working with Magento 2 - Problem-solving skills to identify the cause of the 500 Internal Server Error - Knowledge in server setting modifications, plugin functionality and file management - Immediate availability and capability to work under tight deadlines. Ultimately, the goal is to have the website functioning seamlessly without any errors disrupting operations or customer experience.

    $90 (Avg Bid)
    $90 平均报价
    38 个竞标

    I am seeking a talented and creative writer to construct a beautiful 10-20 line free verse poem centered around the theme of love. This unique piece should deeply express human emotions, tell a compelling story, and truly capture the essence of romantic love. Ideal Skills: - Excellent command of the English language - Deep understanding of free verse poetry - Ability to convey emotions powerfully - Experienced in writing love-themed prose This job requires a perfect blend of creativity and writing skills. If you have a passion for writing and a knack for capturing hearts with your words, I'd be delighted to work with you.

    $234 (Avg Bid)
    $234 平均报价
    23 个竞标