设置方法：
勾选Rules –> Performances –> Simulate Modem Speeds
设置网速：
Rules – Customize Rules（快捷键Ctrl + R）打开Fiddler ScriptEditor，或者直接点开右侧主页签的FiddlerScript
打开该文件后，m_SimulateModem标志位
注：
①、request-trickle-delay中的值代表每KB的数据被上传时会被延时多少毫秒
②、response-trickle-delay则对应下载时每KB的数据会被延时多少毫
举个栗子：比如要模拟上传速度100KBps的网络，那上传延迟就是1KB/100KBps=0.01s=10ms，就改成10
随机延时量设置
static function randInt(min, max) {
return Math.round(Math.random()*(max-min)+min);
}
if (m_SimulateModem) {
// Delay sends by 300ms per KB uploaded.
oSession["request-trickle-delay"] = ""+randInt(100,200);
// Delay receives by 150ms per KB downloaded.
oSession["response-trickle-delay"] = ""+randInt(1,50);
}
