javascript asp教程第七课--response属性

Below is a table of Response Properties along with examples and explanations.






























Response Properties
Buffer Response.Buffer = true
Allows for the buffering of output
CacheControl Response.CacheControl="Public"
Sets Cache to "Public" or "Private"
CharSet Response.CharSet="windows-1252"
Sets the ISO character set
ContentType Response.ContentType="text/HTML"
Specifies the output mime type (text/html, text/plain, GIF, JPG)
Expires Response.Expires=60
Sets page expiration in minutes
ExpiresAbsolute Response.ExpiresAbsolute=#January 31, 2003 13:00:00#
Sets time certain for page to expire
IsClientConnected if (Response.IsClientConnected==true) { }
Determines if client is still connected
PICS ((See Explanation))
Platform for Internet Content Selection
Status Response.Status="401 Unauthorized"
Sets Page Status

You are not required to set, alter, or utilize a single Response Property if you don't want to. Having said that, they can be handy once in while. I've demonstrated all but two Properties in the script below.

By the way, set your properties BEFORE you begin output to the client.

Get Started:

Below is the ASP script for Lesson 07.

<%@LANGUAGE="JavaScript"%>
<%
Response.Buffer=true
Response.CacheControl="Private"
Response.CharSet="windows-1252"
Response.ContentType="text/HTML"
Response.Expires=-1
Response.Status="200 OK"
%>
<HTML>
<BODY>
<%
if (Response.IsClientConnected==true)
{
Response.Write("The client is connected.<BR>")
}
else
{
Response.End()
}
%>
<TABLE BORDER="2">
<TR>
<%
for (x=1;x<=200;x++)
{
Response.Write("<TD>" + x + " </TD>\r")
if (x%10==0)
{
Response.Clear()
}
if (x%4==0)
{
Response.Write("</TR></TABLE>\r")
Response.Write("<TABLE BORDER=\"2\">")
Response.Write("\r<TR>")
Response.Flush()
}
}
%>
</TR></TABLE>
</BODY>
</HTML>

Click Here to run the script in a new window. After you click onto the link, really study the numbers. See if you notice anything weird about the page, like missing numbers.

Response.Buffer:

Let's take the Properties in order of appearance in our script. Response.Buffer allows us to control the output via Response.Flush() and Response.Clear(). If you haven't already, click onto the link to run the script. You'll get a strange output with some of the numbers missing. The missing numbers are thanks to Response.Clear(). You might notice that Response.Flush() slows down the server TREMENDOUSLY. Don't use this method without a reason.

Response.CacheControl:

CacheControl gives you the power to authorize proxy servers to keep your page in cache. (That would be the "Public" setting.) Likewise, it allows you to disallow proxy servers from caching your page. (That would be the "Private" setting). The default is "Private."

Response.CharSet:

CharSet allows you to specify the character set, for example: "ISO 8859-1".

Response.ContentType:

ContentType allows you to indicate the mime type of the output. For example there is text/plain and text/html. There is also GIF and JPEG.

Response.Expires:

Expires allows you set an expiration time for the page. By setting the Expires property to -1, you are saying the page expired one minute before it was delivered. The browser will (hopefully) not store it in cache, but rather make a separate request to the server before re-displaying the page.

Response.Status:

If tomorrow Congress were to pass a law forbidding the use of Response.Status, I think life would go on. If it makes you happy, use it.

Response.IsClientConnected:

IsClientConnected does exactly what it says. It returns a Boolean value that you can use in an "if" statement.

Response.PICS:

PICS stands for Platform for Internet Content Selection. It allows pages to be rated for the presence of violence, sexuality, language and nudity. There are services on the internet to rate your site. I've never used one. I found a sample PICS string on the internet and I converted to JavaScript.

Response.PICS("(PICS-1.1 <http://www.rsac.org/ratingv01.html> labels on \"1997.01.05T08:15-0500\" until \"1999.12.31T23:59-0000\" ratings (v 0 s 0 l 0 n 0))")

It's a long string and your browser may have wrapped the text down to a second line. If that's the case, then you have to pretend that the entire PICS string is on one line.

Response.ExpiresAbsolute:

I did not demonstrate ExpiresAbsolute in the script because I already used Response.Expires. ExpiresAbsolute does exactly the same thing as Expires, except it uses a date and time certain. (I couldn't see using both in the same script.) The only thing I would point out is the pound signs (#) at the beginning and and of the date.

(0)

相关推荐

  • JavaEE通过response实现请求重定向

    请求重定向指的是一个web资源收到客户端请求后,通知客户端去访问另外一个web资源,这称之为请求重定向.302状态码和location头即可实现重定向. 请求重定向最常见的应用场景就是用户登录. 下面的示例代码从另一个页面重定向到用户登录页面: 复制代码 代码如下: package com.yyz.response;  import java.io.IOException;  import javax.servlet.ServletException;  import javax.servlet

  • 获取软件下载的真实地址!再谈获取Response.redirect重定向的URL

    http://www.im286.com/viewthread.php?tid=1550010&extra=page%3D1 其实这个问题落伍谈了n次了其中care4也说了两次所以如果你有问题最好先搜索一下 说不定问题早有人解决了http://www.im286.com/viewthread. ... ;highlight=%2Bcare4http://www.im286.com/viewthread. ... ;highlight=%2Bcare4care4的代码有一个小缺点 就是需要组件.第

  • javascript asp教程第六课-- response方法

    response 对象:reponse是asp中六个对象之一.它代表了服务器端对浏览器的回应.response有8种方法,9种属性和一个集.在这一课,我们就重点讲述方法.方法:在javascript中,asp方法使用括号.请注意依赖response.buffer的两个方法,我们将在下一课讲到他们.同样应该注意到addheader()和redirect(),因为他们必须优先于write()执行.所有的方法都在上面描述和演示了.下面我将详细讲述每一个方法.我将花点额外的时间来讲述我们用的最多的两个方

  • ASP .NET调用javascript中Response.Write和ClientScript.RegisterStartupScript的区别

    例如下面的代码 复制代码 代码如下: StringBuilder sb = new StringBuilder(); sb.Append("<script language=javascript>"); sb.Append("alert(document.forms.length);"); sb.Append("</script>"); Response.Write(sb.ToString()); ClientScript

  • JavaEE中用response向客户端输出中文数据乱码问题分析

    Web服务器收到客户端的http请求,会针对每一次请求,分别创建一个用于代表请求的request对象,和代表响应的response对象.request和response对象既然代表请求和响应,那我们要获取客户机提交过来的数据,只需要找request对象就行了.要向客户机输出数据,只需要找response对象就行了. 复制代码 代码如下: package com.yyz.response;  import java.io.IOException;  import java.io.OutputStr

  • javascript asp教程第七课--response属性

    Below is a table of Response Properties along with examples and explanations. Response Properties Buffer Response.Buffer = trueAllows for the buffering of output CacheControl Response.CacheControl="Public" Sets Cache to "Public" or &qu

  • javascript asp教程第四课 同时使用vbscript和javascript

    开始: 你能让javascript和vbscript实现从同一个表格里传出音乐.看看下面的脚本: function JSGreeting() { return "Greetings from a JavaScript Function"; } Function VBGreeting() VBGreeting="Greetings from a VBScript Function" End Function Function toDollars(x) toDollar

  • javascript asp教程第五课--合二为一

    两条防线,一个函数: 试问你如何能保证客户端和服务器端具有相同的功能?表单域的验证闪现在我们眼前.别人把你的html复制到另外一个脚本,然后改变客户端的表单域验证--这并不是一件难事.摆在眼前的解决方法是将表单域的验证放置在服务器端.但那又意味着因为使用者的一个小错误,都要给服务器端要返回一串的错误信息.那么,我们何不同时拥有二者呢?不仅仅如此,我们还可以在客户端和服务器端使用同一个javascript函数来保证二者的完全一致性. 看看下面这一小段,请特别注意一下checkMyZip()函数.

  • javascript asp教程第三课 new String() 构造器

    开始:new String() 是本课程计划中较早出现的另一个让人感觉到奇怪的地方.但和转义字符一样, new String()是创建一个成功的asp javascript应用的必须元素.下面是本课的两个脚本:下面是实际上承担重量的脚本:行为中的new String( ):现在我们来看看下面的asp行.Request.Form 我们将在后面有独立的课程来讲授.下面才是我们现在要讲的重点.在request.form中所持有的数据(来自用户的数据)并不是一个javascript数据类型.相反,它是一

  • javascript asp教程第十三课--include文件

    Server Side Includes: Experienced JavaScript programmers know that code reuse is good. Experienced JavaScript programmers also know that JavaScript functions are data types. So, we should be able to store a JavaScript function inside a Session Variab

  • javascript asp教程第八课--request对象

    Request Object: Request has five (5) Collections, one (1) Property, and one (1) Method. You'll use the Collections far more than the property or the method. Request Collections: Below is a table of the Request Collections and descriptions of how they

  • javascript asp教程第十课--global asa

    Global.asa: First of all, what is a global.asa? It's an optional script file that holds certain "global" information that you can access through the entire ASP appliciation. The global.asa is a plain text file saved with the .asa extension. You

  • javascript asp教程第十一课--Application 对象

    Overview: The Application Object represents a collection of ASP pages. The Application object has zero (0) properties, two (2) collections, two (2) methods, and two (2) events. Get Started: Below are a couple scripts for lesson11. <%@LANGUAGE="Jav

  • VBScript教程 第七课使用条件语句

    VB教程 > 第七课使用条件语句 控制程序执行 使用条件语句和循环语句可以控制 Script 的流程.使用条件语句可以编写进行判断和重复操作的 VBScript 代码.在 VBScript 中可使用以下条件语句: · If...Then...Else 语句 · select Case 语句 使用 If...Then...Else 进行判断 If...Then...Else 语句用于计算条件是否为 True 或 False,并且根据计算结果指定要运行的语句.通常,条件是使用比较运算符对值或变量进行

随机推荐