javascript類比的Ping效果代碼（Web Ping）

最後更新：2018-12-08 來源：互聯網

上載者：User

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當然,在請求時無法統計HTTP頭部的長度,所以當請求資料包長度在傳輸單元最大值臨界點時,額外的HTTP頭可以導致IP分組,因此存在一定的誤差.(2009/6/21)

線上示範：http://demo.jb51.net/js/2011/ping/

核心代碼：複製代碼代碼如下:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>HTTP Ping</title>
<style>
html
{
height: 100%;
overflow: hidden;
}
body
{
background: #000;
color: #C0C0C0;
font-weight: bold;
font-size: 14px;
font-family: Lucida Console;
height: 100%;
margin: 0 0 0 5px;
}
#divContent
{
height: 90%;
overflow: auto;
}
#txtTimeout
{
width: 40px;
}
button
{
margin-left: 10px;
}
</style>
</head>
<body>
<div id="divInput">
<span>URL:</span>
<input id="txtURL" type="text" />
<span>Timeout:</span>
<input id="txtTimeout" type="text" value="2000" />
<input id="btnSwitch" type="button" value="Start" onclick="handleBtnClick()" />
<hr/>
</div>
<div id="divContent"></div>
<script>
var intStartTime;
var objIMG = new Image();
objIMG.onload =
objIMG.onerror =
function()
{
/*
* 有回應,取消逾時計時
*/
clearTimeout(intTimerID);
if(!bolIsRunning || bolIsTimeout)
return;
var delay = new Date() - intStartTime;
println("Reply from " +
strURL +
" time" +
((delay<1)?("<1"):("="+delay)) +
"ms");
arrDelays.push(delay);
/*
* 每次請求間隔限制在1秒以上
*/
setTimeout(ping, delay<1000?(1000-delay):1000);
}
function ping()
{
/*
* 發送請求
*/
intStartTime = +new Date();
intSent++;
objIMG.src = strURL + "/" + intStartTime;
bolIsTimeout = false;
/*
* 逾時計時
*/
intTimerID = setTimeout(timeout, intTimeout);
}
function timeout()
{
if(!bolIsRunning)
return;
bolIsTimeout = true;
objIMG.src = "X:\\";
println("Request timed out.");
ping();
}
</script>
<script>
var $ = function(v){return document.getElementById(v)};
var arrDelays = [];
var intSent;
var bolIsRunning = false;
var bolIsTimeout;
var strURL;
var intTimeout;
var intTimerID;
var objBtn = $("btnSwitch");
var objContent = $("divContent");
var objTxtURL = $("txtURL");
objTxtURL.value = window.location.host;
function handleBtnClick()
{
if(bolIsRunning)
{
/*
* 停止
*/
var intRecv = arrDelays.length;
var intLost = intSent-intRecv;
var sum = 0;
for(var i=0; i<intRecv; i++)
sum += arrDelays[i];
objBtn.value = "Start";
bolIsRunning = false;
/*
* 統計結果
*/
println("　");
println("Ping statistics for " + strURL + ":");
println("　　Packets: Sent = " +
intSent +
", Received = " +
intRecv +
", Lost = " +
intLost +
" (" +
Math.floor(intLost / intSent * 100) +
"% loss),");
if(intRecv == 0)
return;
println("Approximate round trip times in milli-seconds:");
println("　　Minimum = " +
Math.min.apply(this, arrDelays) +
"ms, Maximum = " +
Math.max.apply(this, arrDelays) +
"ms, Average = " +
Math.floor(sum/intRecv) +
"ms");
}
else
{
/*
* 開始
*/
strURL = objTxtURL.value;
if(strURL.length == 0)
return;
if(strURL.substring(0,7).toLowerCase() != "http://")
strURL = "http://" + strURL;
intTimeout = parseInt($("txtTimeout").value, 10);
if(isNaN(intTimeout))
intTimeout = 2000;
if(intTimeout < 1000)
intTimeout = 1000;
objBtn.value = "Stop ";
bolIsRunning = true;
arrDelays = [];
intSent = 0;
cls();
println("Pinging " + strURL + ":");
println("　");
ping();
}
}
function println(str)
{
var objDIV = document.createElement("div");
if(objDIV.innerText != null)
objDIV.innerText = str;
else
objDIV.textContent = str;
objContent.appendChild(objDIV);
objContent.scrollTop = objContent.scrollHeight;
}
function cls()
{
objContent.innerHTML = "";
}
</script>
</body>
</html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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