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怎么用javascript实现ping一个主机代码

仅测试是否能够连接,不算ping function ping(ip){ var img = new Image(); var start = new Date(...

HTML 阅读 38.9万 2 分钟阅读 2017-08-25 15:01

仅测试是否能够连接,不算ping

function ping(ip){
  var img = new Image();
  var start = new Date().getTime();
  img.src = "http://" + ip +"?t="+start;
  var flag = false;
  img.onload = function(){
    flag = true;
    console.log('ok');
  }
  var timer = setTimeout(function(){
      if(!flag){
        flag = false;
        console.log('failed');
      }


  },1500);
}


ping('192.168.1.106');

Comments 评论区

广西南宁市 2017-08-25 15:02

这样 ping('www.lizhenqiu.com/img/bdlogo.gif');
，只能用图片url，直接域名不行的

广西南宁市2017-08-25 15:03:26

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>HTTP Ping</title>
<style>
html
{
	height: 100%;
	overflow: hidden;
}

body
{
	background: #000;
	color: #C0C0C0;
	font: bold 14px '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>Host:</span>
	<input id="txtURL" type="text" />
	<span>Timeout:</span>
	<input id="txtTimeout" type="text" value="2000" />
	<input id="btnSwitch" type="button" value="Start" onclick="handleClick()" />
	<hr/>
</div>
<div id="divContent"></div>

<script>
var iSeq = 0;
var iSent, iReply;
var iSum, iMax, iMin;

var sURL, iTimeout;
var bRunning = false;
var tick, tid;


function reply()
{
	if(!bRunning || this.seq != iSeq)
		return;

	/*
	 * 取消超时计时
	 */
	clearTimeout(tid);

	++iReply;

	var delay = new Date - tick;

	iSum += delay;

	if(delay > iMax)
		iMax = delay;

	if(delay < iMin)
		iMin = delay;

	println("Reply from " +
			sURL +
			" time" +
			((delay<1)? ("<1") : ("="+delay)) +
			"ms");

	tid = setTimeout(ping, Math.max(1000-delay, 1000));
}


function ping()
{
	tick = +new Date;
	++iSent;

	tid = setTimeout(timeout, iTimeout);

	var oImg = new Image;
	oImg.onload = reply;
	oImg.onerror = reply;
	oImg.seq = ++iSeq;

	// 发送请求
	oImg.src = sURL + "/" + tick + ".html";
}

function timeout()
{
	if(!bRunning)
		return;

	println("Request timed out.");
	ping();
}
</script>


<script>
function $(v){return document.getElementById(v)}

var oBtn = $("btnSwitch");
var oContent = $("divContent");
var txtURL = $("txtURL");


txtURL.value = location.host;


function handleClick()
{
	if(bRunning)
	{
		/*
		 * 停止
		 */
		oBtn.value = "Start";
		bRunning = false;

		clearTimeout(tid);

		/*
		 * 统计结果
		 */
		var lost = iSent - iReply;

		println("　");
		println("Ping statistics for " + sURL + ":");
		println("　　Packets: Sent = " +
				iSent +
				", Received = " +
				iReply +
				", Lost = " +
				lost +
				" (" +
				Math.round(lost / iSent * 100) +
				"% loss),");

		if(iReply == 0)
			return;

		println("Approximate round trip times in milli-seconds:");
		println("　　Minimum = " +
				iMin +
				"ms, Maximum = " +
				iMax +
				"ms, Average = " +
				Math.round(iSum / iReply) +
				"ms");
	}
	else
	{
		/*
		 * 开始
		 */
		sURL = txtURL.value;

		if(sURL.length == 0)
			return;

		if(sURL.substring(0,7).toLowerCase() != "http://")
			sURL = "http://" + sURL;

		iTimeout = parseInt($("txtTimeout").value, 10);
		if(isNaN(iTimeout))
			iTimeout = 2000;
		if(iTimeout < 1000)
			iTimeout = 1000;

		oBtn.value = "Stop ";
		bRunning = true;

		iSent = 0;
		iReply = 0;
		iSum = 0;
		iMax = -1;
		iMin = 1e9;

		cls();
		println("Pinging " + sURL + ":");
		println("　");
		ping();
	}
}

function println(str)
{
	var div = document.createElement("div");

	if(div.innerText != null)
		div.innerText = str;
	else
		div.textContent = str;

	oContent.appendChild(div);
	oContent.scrollTop = oContent.scrollHeight;
}

function cls()
{
	oContent.innerHTML = "";
}
</script>
</body>
</html>

#⁰

广西南宁市 2017-08-25 15:04

php怎么判断用户的网络速度快慢

$fp=fopen("cs.txt","w");  
for($i=0;$i<170400;$i++){  
    fwrite($fp,"test");  
}  
fclose($fp); 
 
 
//计算网速
 
function getmicrotime()
    {
    list($usec,$sec) = explode("",microtime());
    return ((float)($usec) + (float)($sec));
    }
    $data = file_get_contents("cs.txt");
    $start = getmicrotime();
    $filesize = filesize("cs.txt") / 1024;
    echo "<!--".$data."-->";
    $stop =   getmicrotime();
    $duration = ($stop - $start);
    $speed = round($filesize/$duration,2);
    echo "你的网速：$speed kB/秒";

#⁰

广西南宁市 2017-08-25 15:05

JS使用http协议实现ping功能
目前项目需要用到，实现原理很简单，提交一个ajax请求，并分别记录发送时间和收到回复时间即可。

$.ping = function(option) 
{
    var ping, requestTime, responseTime ;
    var getUrl = function(url){    //保证url带http://
        var strReg="^((https|http)?://){1}"
        var re=new RegExp(strReg); 
        return re.test(url)?url:"http://"+url;
    }
    $.ajax({
        url: getUrl(option.url)+'/'+ (new Date()).getTime() + '.html',  //设置一个空的ajax请求
        type: 'GET',
        dataType: 'html',
        timeout: 10000,
        beforeSend : function() 
        {
            if(option.beforePing) option.beforePing();
            requestTime = new Date().getTime();
        },
        complete : function() 
        {
            responseTime = new Date().getTime();
            ping = Math.abs(requestTime - responseTime);
            if(option.afterPing) option.afterPing(ping);
        }
    });
 
    if(option.interval && option.interval > 0)
    {
        var interval = option.interval * 1000;
        setTimeout(function(){$.ping(option)}, interval);
//        option.interval = 0;        // 阻止多重循环
//        setInterval(function(){$.ping(option)}, interval);
    }
};

#⁰

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