如何访问网页里frame中的数据? By design, the server that hosts your web site delivers a 404 Error / Page Not Found when a surfer clicks on a link that the server cannot find or something else unexpected happens. The most common error page is the HTTP 404 "Not found: The requested URL/whatever.html was not found on this server."
This generally happens when a person clicks on a link for page that has been removed, renamed or otherwise changed.
如果点击已移除、重命名或者已修改的网站链接，就会出现404页面。
What happens to your web visitor who got that error message? Generally speaking they're off faster than a "speeding bullet" looking for the information they were seeking - probably to a different website. That's something you really don't want to have happen and it can be prevented with a custom 404 error page that gives them options on the error page that will tell them how to find what they were looking for.
So the answer is? Create your own custom 404 Error page that suggests other resources on your site and then helps redirects that person to them.
如何解决呢？创建404页面，引导用户找到所需信息。
In essence you're capturing traffic that you had, but lost and didn't know it, and keeping that visitor by helping them find what they need and possible turn them into a buyer for your product or service later on.
But "I don't have the time or know how to make a custom 404 page", you say.
但是，你可能会说，我没有时间，也不知道如何制作404页面。
Well good news - it's not as hard as you think. If you have about 30 minutes and your server is a Unix web server then it's virtually a snap to do.
事实并没有你想得那么复杂。你只要利用30分钟的时间，利用Unix服务器，你可以很快完成。
Your Custom 404 Page Design 404页面的设计方法
In my opinion your custom 404 error page should provide at least these four components:
我认为，404错误页面至少应该包含以下四项内容：
A statement that the requested page was not found.
陈述页面未找到。 Description of why the page may be missing.
介绍没找到页面的原因。 A site search box for the surfer to look for other pages on your site.
提供搜索框，确保访问者登录网站其它页面。 A "plug" for one of your Free products or services.
指引用户登录免费产品或者免费服务网页。 You can of course add other components like simple java script code for date & time and IP address display, etc. if you really want to impress someone with your technical wizardry.
Your page also should carry the look and feel of your web site, so you should include your header or footer or both so it is clearly branded as yours. You may wish to include some other links for your site that lead visitors to other pages you may want them to visit.
The simplest method is to create your new custom page, then upload it to your site in the same folder where your home page is located. Servers vary in their requirements. For mine the page must have a specific name for it to function properly as my custom 404 error page.
If you don't have an .htaccess file you need to create one in the same folder where your home page is stored, (in some cases, the file may already exist; on servers with FrontPage extensions this file is automatically created). You'll need to do a simple edit in this file. Use your text editor or server editito to add the following command:
The above example assumes your home page is named index.html. If not, replace it with whatever name you are using for your home page instead.
上述例子中，我们假设主页被命名为index.html；如果不是，运用主页的其它名称把其代替。
If you use Microsoft Internet Explorer and the option to Show friendly HTTP error messages is enabled, the file size of your custom error page must be no less than 512 bytes to function properly. Otherwise, the program will show a generic message.
如果使用Microsoft Internet Explorer，你可以正确显示HTTP错误页面，但错误文本的页面应该小于512bytes，否则程序会呈现一些普通信息。
There you have it. Design your page, follow the two simple steps above and you'll soon have your own custom 404 error page that will capture lost visitors and keep them on your site.
现在，你可以根据以上两个简单步骤，创建可以挽回网站访问者的404页面。
One final note - before you start on setting up your own custom error page check the FAQ or knowledgebase for your website's server for the specific requirements for making sure your new page works.
![[鍜界値鍚冧粈涔堣嵂]姣忓ぉ娉�2琚嬶紝鍧氭寔30澶╋紝鍜界値濂藉鍒�](http://www.shuyancha.com/images/syc.jpg)
