如果是懂SEO的人都知道robots.txt文件的重要性。但是如果什么不知道robots.txt的重要性，正确建立robots.txt 文件的内容可有效的优化magento网站，防止垃圾链接网址被搜索引擎纳入索引，降低网站的权重。
该怎么去建一个robots.txt呢？
# Website Sitemap
Sitemap: http://www.mydomain.com/sitemap.xml
# Crawlers Setup
User-agent: *
Crawl-delay: 10
# Allowable Index
Allow: /*?p=
Allow: /catalog/seo_sitemap/category/
Allow:/catalogsearch/result/
# Directories
Disallow: /404/
Disallow: /app/
Disallow: /cgi-bin/
Disallow: /downloader/
Disallow: /includes/
Disallow: /js/
Disallow: /lib/
Disallow: /magento/
Disallow: /media/
Disallow: /pkginfo/
Disallow: /report/
Disallow: /skin/
Disallow: /stats/
Disallow: /var/
# Paths (clean URLs)
Disallow: /index.php/
Disallow: /catalog/product_compare/
Disallow: /catalog/category/view/
Disallow: /catalog/product/view/
Disallow: /catalogsearch/
Disallow: /checkout/
Disallow: /control/
Disallow: /contacts/
Disallow: /customer/
Disallow: /customize/
Disallow: /newsletter/
Disallow: /poll/
Disallow: /review/
Disallow: /sendfriend/
Disallow: /tag/
Disallow: /wishlist/
# Files
Disallow: /cron.php
Disallow: /cron.sh
Disallow: /error_log
Disallow: /install.php
Disallow: /LICENSE.html
Disallow: /LICENSE.txt
Disallow: /LICENSE_AFL.txt
Disallow: /STATUS.txt
# Paths (no clean URLs)
Disallow: /*.js$
Disallow: /*.css$
Disallow: /*.php$
Disallow: /*?p=*&
Disallow: /*?SID=