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答案：不用耗费额外的精力随时查看Json输出
“不用耗费额外的精力”指的是：当需要查看Json输出时，只要转转眼球（可能至少还需要点两下鼠标，恐怕）就能很快找到想看的结果。
查看Json输出的方法很多，我们所能找的最接近这个目标的方案是“Fiddler2+JsonViewer插件+自定义Fiddler2过滤条件”。想要查看Json输出时，只要先将Fiddler运行起来，然后在浏览器里正常操作Web页面，就可以在Fiddler里面看到截获的Json输出了，效果如下图所示。
安装Fiddler2+JsonViewer插件
Fiddler2是一款老牌Web调试工具。下载、安装之后，通过点击“开始|程序|Fiddler2”或点击IE的菜单“工具|Fiddler2”将其运行起来后，它会自动把自己注册成IE的代理服务器，从而截获任何经过IE的请求/应答；当关闭它时，它又会自动把代理服务器配置取消（当年使用Fiddler1的时候，还得自己添加代理服务器配置，很麻烦的说）。
JsonViewer是一款查看Json对象的小工具。解压后，可以看到3个子目录：
- JsonView：可独立运行版。
- Visualizer：VS2005插件。
- Fiddler：Fiddler2插件。
我们接下来要安装JsonViewer的Fiddler2插件。方法是，将Fiddler目录中的所有文件复制到“Fiddler2的安装目录\Inspectors\”。然后修改“Fiddler2的安装目录\fiddler.exe.config”，如下图所示，粗体部分是需要我们添加的配置信息。复制代码 代码如下:
<configuration>
<runtime>
<generatePublisherEvidence enabled="false"/>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<probing privatePath="Inspectors" />
</assemblyBinding>
</runtime>
</configuration>
注意 IE7 和 .NET Framework 被硬编码成只要是对localhost的请求，就不通过代理服务器。所以像“http://localhost:8000/Default.aspx”这样的请求不会被Fiddler2截获。解决方法是：1) 将“localhost”替换成“localhost.”,如“http://localhost.:8000/Default.aspx”；2) 将“localhost”替换成本机IP地址，如“http://172.16.75.78:8000/Default.aspx”。
现在，让我们把Fiddler2运行起来，再操作一下页面，就可以在Fiddler2窗体左侧的“Web Sessions”列表里看到一大堆请求/应答。点击返回Json的那一条，再点击进入右侧的“Inspectors”、“Json”Tab页，就可以了。只是，Fiddler2默认会把所有经过IE的任何请求/应答全都显示出来，这样一来，“Web Sessions”列表里的东东就嫌太多了，能不能把与Json不相干的东东全部过滤掉呢？这个并不难，只要在Fiddler2的“CustomRules”里面增加几行代码就可以了。
自定义过滤条件
点击Fiddler2的菜单“Rules|Customize Rules...”，会自动由记事本打开可添加自定义规则的代码文件。
在第81行增加如下代码，目的是在Fiddler2的Rules菜单里增加一个“只显示Json”的菜单项：
// jcl20091121
public static RulesOption("只显示 &Json")
var m_ShowJsonOnly: boolean = false;
在OnBeforeResponse事件里增加如下代码，意思是如果“Rules|只显示Json”菜单项被选中了，就过滤掉所有Content-Type!="application/json; charset=utf-8"的应答。复制代码 代码如下:
// jcl:2009-11-21
if(m_ShowJsonOnly) {
//MessageBox.Show(oSession.oResponse.headers.Item("Content-Type").ToString());
if (!oSession.oResponse.headers.ExistsAndContains("Content-Type", "application/json; charset=utf-8")) {
oSession["ui-hide"] = "hide"; // String value not important
}
}
所有源码在此：
自定义规则复制代码 代码如下:
import System;
import System.Windows.Forms;
import Fiddler;
// GLOBALIZATION NOTE:
// Be sure to save this file with UTF-8 Encoding if using any non-ASCII characters
// in strings, etc.
//
// JScript Reference
// http://www.fiddler2.com/redir/?id=msdnjsnet
//
// FiddlerScript Reference
// http://www.fiddler2.com/redir/?id=fiddlerscriptcookbook
//
// FiddlerScript Editor:
// http://www.fiddler2.com/redir/?id=fiddlerscripteditor
class Handlers
{
// The following snippet demonstrates a custom-bound column for the web sessions list.
// See http://www.fiddler2.com/fiddler/help/configurecolumns.asp for more info
//public static BindUIColumn("Method", 60)
//function FillMethodColumn(oS: Session){
// if ((oS.oRequest != null) && (oS.oRequest.headers != null))
// return oS.oRequest.headers.HTTPMethod; else return String.Empty;
//}
public static RulesOption("Hide 304s")
var m_Hide304s: boolean = false;
// Cause Fiddler to override the Accept-Language header with one of the defined values
public static RulesOption("Request &Japanese Content")
var m_Japanese: boolean = false;
// Cause Fiddler to override the User-Agent header with one of the defined values
RulesString("&User-Agents", true)
RulesStringValue(0,"Netscape &3", "Mozilla/3.0 (Win95; I)")
RulesStringValue(1,"&IEMobile", "Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12)")
RulesStringValue(2,"&Safari (XP)", "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) AppleWebKit/531.9 (KHTML, like Gecko) Version/4.0.3 Safari/531.9.1")
RulesStringValue(3,"IE &6 (XPSP2)", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)")
RulesStringValue(4,"IE &7 (Vista)", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1)")
RulesStringValue(5,"IE &8 (Win2k3 x64)", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; WOW64; Trident/4.0)")
RulesStringValue(6,"IE 8 (Win7)", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)")
RulesStringValue(7,"IE 8 (IE7 CompatMode)", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0)")
RulesStringValue(8,"&Opera 10", "Opera/9.80 (Windows NT 5.2; U; en) Presto/2.2.15 Version/10.00")
RulesStringValue(9,"&Firefox 2", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.10) Gecko/20071115 Firefox/2.0.0.10")
RulesStringValue(10,"&Firefox 3.5", "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3")
RulesStringValue(10,"&Firefox (Mac)", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3")
RulesStringValue(12,"Chrome", "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.24 Safari/532.0")
RulesStringValue(13,"&Custom", "%CUSTOM%")
public static var sUA: String = null;
// Cause Fiddler to delay HTTP traffic to simulate typical 56k modem conditions
public static RulesOption("Simulate &Modem speeds", "Per&formance")
var m_SimulateModem: boolean = false;
// Removes HTTP-caching related headers and specifies "no-cache" on requests and responses
public static RulesOption("&Disable Caching", "Per&formance")
var m_DisableCaching: boolean = false;
// Show the duration between the start of Request.Send and Response.Completed in Milliseconds
public static RulesOption("&Show Time-to-Last-Byte", "Per&formance")
var m_ShowTTLB: boolean = false;
// Show the time of response completion
public static RulesOption("Show Response &Timestamp", "Per&formance")
var m_ShowTimestamp: boolean = false;
// Create a new option on the Rules menu. Set the default value for the option.
public static RulesOption("&UNTITLED")
var m_bUNTITLED: boolean = false;
// Create a new item on the Tools menu.
public static ToolsAction("&UNTITLED")
function DoUNTITLED(oSessions: Fiddler.Session[]){
// Write your code here
}
// jcl20091121
public static RulesOption("只显示 &Json")
var m_ShowJsonOnly: boolean = false;
// Force a manual reload of the script file. Resets all
// RulesOp
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