javascript模拟的Ping效果代码（Web Ping）-javascript技巧

名站网址导航为大家提供关于网站网页设计设计相关的的教程知识。

本篇文章具体介绍如下

当然,在请求时无法统计hTTP头部的长度,所以当请求数据包长度在最大传输单元临界点时,额外的hTTP头可以导致IP分组,因此存在一定的误差.(2009/6/21)

在线演示：http://demo.jb51.net/js/2011/ping/

核心具体代码：
具体代码如下:
<!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()
{
/*
* 有回应,取消超时计时
*/
clearTimeout(intTimerID);
if(!bolIsRunning || bolIsTimeout)
return;
var delay = new Date() - intStartTime;
println("Reply from "
strURL
" time"
((delay<1)?("<1"):("=" delay))
"ms");
arrDelays.push(delay);
/*
* 每次请求间隔限制在1秒以上
*/
setTimeout(ping, delay<1000?(1000-delay):1000);
}
function ping()
{
/*
* 发送请求
*/
intStartTime = new Date();
intSent ;
objIMG.src = strURL "/" intStartTime;
bolIsTimeout = false;
/*
* 超时计时
*/
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 = $("txtURL");
objTxtURL.value = window.location.host;
function handleBtnClick()
{
if(bolIsRunning)
{
/*
* 停止
*/
var intRecv = arrDelays.length;
var intLost = intSent-intRecv;
var sum = 0;
for(var i=0; i<intRecv; i )
sum = arrDelays[i];
objBtn.value = "Start";
bolIsRunning = false;
/*
* 统计结果
*/
println("　");
println("Ping statistics for " strURL ":");
println("　　Packets: Sent = "
intSent
", Received = "
intRecv
", Lost = "
intLost
" ("
Math.floor(intLost / intSent * 100)
"% loss),");
if(intRecv == 0)
return;
println("Approximate round trip times in milli-seconds:");
println("　　Minimum = "
Math.min.apply(this, arrDelays)
"ms, Maximum = "
Math.max.apply(this, arrDelays)
"ms, Average = "
Math.floor(sum/intRecv)
"ms");
}
else
{
/*
* 开始
*/
strURL = objTxtURL.value;
if(strURL.length == 0)
return;
if(strURL.substring(0,7).toLowerCase() != "http://")
strURL = "http://" strURL;
intTimeout = parseInt($("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>