我如何创建一个JavaScript页面,将检测用户的互联网速度,并显示在页面上?比如“你的网速是??/??”Kb / s”。
当前回答
由于Punit S的回答,为了检测动态连接速度的变化,你可以使用以下代码:
navigator.connection.onchange = function () {
//do what you need to do ,on speed change event
console.log('Connection Speed Changed');
}
其他回答
图像技巧很酷,但在我的测试中,它是在我想完成的一些ajax调用之前加载的。
2017年合适的解决方案是使用工人(http://caniuse.com/#feat=webworkers)。
工人看起来像这样:
/**
* This function performs a synchronous request
* and returns an object contain informations about the download
* time and size
*/
function measure(filename) {
var xhr = new XMLHttpRequest();
var measure = {};
xhr.open("GET", filename + '?' + (new Date()).getTime(), false);
measure.start = (new Date()).getTime();
xhr.send(null);
measure.end = (new Date()).getTime();
measure.len = parseInt(xhr.getResponseHeader('Content-Length') || 0);
measure.delta = measure.end - measure.start;
return measure;
}
/**
* Requires that we pass a base url to the worker
* The worker will measure the download time needed to get
* a ~0KB and a 100KB.
* It will return a string that serializes this informations as
* pipe separated values
*/
onmessage = function(e) {
measure0 = measure(e.data.base_url + '/test/0.bz2');
measure100 = measure(e.data.base_url + '/test/100K.bz2');
postMessage(
measure0.delta + '|' +
measure0.len + '|' +
measure100.delta + '|' +
measure100.len
);
};
调用Worker的js文件:
var base_url = PORTAL_URL + '/++plone++experimental.bwtools';
if (typeof(Worker) === 'undefined') {
return; // unsupported
}
w = new Worker(base_url + "/scripts/worker.js");
w.postMessage({
base_url: base_url
});
w.onmessage = function(event) {
if (event.data) {
set_cookie(event.data);
}
};
摘自我编写的Plone包的代码:
https://github.com/collective/experimental.bwtools/blob/master/src/experimental/bwtools/browser/static/scripts/
最好使用图像来测试速度。但是如果你必须处理zip文件,下面的代码可以工作。
var fileURL = "your/url/here/testfile.zip";
var request = new XMLHttpRequest();
var avoidCache = "?avoidcache=" + (new Date()).getTime();;
request.open('GET', fileURL + avoidCache, true);
request.responseType = "application/zip";
var startTime = (new Date()).getTime();
var endTime = startTime;
request.onreadystatechange = function () {
if (request.readyState == 2)
{
//ready state 2 is when the request is sent
startTime = (new Date().getTime());
}
if (request.readyState == 4)
{
endTime = (new Date()).getTime();
var downloadSize = request.responseText.length;
var time = (endTime - startTime) / 1000;
var sizeInBits = downloadSize * 8;
var speed = ((sizeInBits / time) / (1024 * 1024)).toFixed(2);
console.log(downloadSize, time, speed);
}
}
request.send();
对于小于10MB的文件,这将不能很好地工作。您必须在多次下载尝试中运行聚合结果。
小片段:
var speedtest = {};
function speedTest_start(name) { speedtest[name]= +new Date(); }
function speedTest_stop(name) { return +new Date() - speedtest[name] + (delete
speedtest[name]?0:0); }
使用:
speedTest_start("test1");
// ... some code
speedTest_stop("test1");
// returns the time duration in ms
还可以进行更多的测试:
speedTest_start("whole");
// ... some code
speedTest_start("part");
// ... some code
speedTest_stop("part");
// returns the time duration in ms of "part"
// ... some code
speedTest_stop("whole");
// returns the time duration in ms of "whole"
我需要一个快速的方法来确定用户连接速度是否足够快,以启用/禁用我正在工作的网站中的某些功能,我做了这个小脚本,平均下载单个(小)图像所需的时间多次,它在我的测试中工作得相当准确,能够清楚地区分3G或Wi-Fi,例如,也许有人可以做一个更优雅的版本,甚至是jQuery插件。
var arrTimes = []; var i = 0; // start var timesToTest = 5; var tThreshold = 150; //ms var testImage = "http://www.google.com/images/phd/px.gif"; // small image in your server var dummyImage = new Image(); var isConnectedFast = false; testLatency(function(avg){ isConnectedFast = (avg <= tThreshold); /** output */ document.body.appendChild( document.createTextNode("Time: " + (avg.toFixed(2)) + "ms - isConnectedFast? " + isConnectedFast) ); }); /** test and average time took to download image from server, called recursively timesToTest times */ function testLatency(cb) { var tStart = new Date().getTime(); if (i<timesToTest-1) { dummyImage.src = testImage + '?t=' + tStart; dummyImage.onload = function() { var tEnd = new Date().getTime(); var tTimeTook = tEnd-tStart; arrTimes[i] = tTimeTook; testLatency(cb); i++; }; } else { /** calculate average of array items then callback */ var sum = arrTimes.reduce(function(a, b) { return a + b; }); var avg = sum / arrTimes.length; cb(avg); } }
尽管这是旧的和回答,我想分享的解决方案,我做出了它2020年的基础上的影子巫师说不再战争的解决方案
我只是将它合并到一个对象中,该对象具有随时运行的灵活性,并在指定的mbps高于或低于测量结果时运行回调。
可以在包含testConnectionSpeed对象后的任何位置启动测试
/**
* @param float mbps - Specify a limit of mbps.
* @param function more(float result) - Called if more mbps than specified limit.
* @param function less(float result) - Called if less mbps than specified limit.
*/
testConnectionSpeed.run(mbps, more, less)
例如:
var testConnectionSpeed = { imageAddr : "https://upload.wikimedia.org/wikipedia/commons/a/a6/Brandenburger_Tor_abends.jpg", // this is just an example, you rather want an image hosted on your server downloadSize : 2707459, // Must match the file above (from your server ideally) run:function(mbps_max,cb_gt,cb_lt){ testConnectionSpeed.mbps_max = parseFloat(mbps_max) ? parseFloat(mbps_max) : 0; testConnectionSpeed.cb_gt = cb_gt; testConnectionSpeed.cb_lt = cb_lt; testConnectionSpeed.InitiateSpeedDetection(); }, InitiateSpeedDetection: function() { window.setTimeout(testConnectionSpeed.MeasureConnectionSpeed, 1); }, result:function(){ var duration = (endTime - startTime) / 1000; var bitsLoaded = testConnectionSpeed.downloadSize * 8; var speedBps = (bitsLoaded / duration).toFixed(2); var speedKbps = (speedBps / 1024).toFixed(2); var speedMbps = (speedKbps / 1024).toFixed(2); if(speedMbps >= (testConnectionSpeed.max_mbps ? testConnectionSpeed.max_mbps : 1) ){ testConnectionSpeed.cb_gt ? testConnectionSpeed.cb_gt(speedMbps) : false; }else { testConnectionSpeed.cb_lt ? testConnectionSpeed.cb_lt(speedMbps) : false; } }, MeasureConnectionSpeed:function() { var download = new Image(); download.onload = function () { endTime = (new Date()).getTime(); testConnectionSpeed.result(); } startTime = (new Date()).getTime(); var cacheBuster = "?nnn=" + startTime; download.src = testConnectionSpeed.imageAddr + cacheBuster; } } // start test immediatly, you could also call this on any event or whenever you want testConnectionSpeed.run(1.5, function(mbps){console.log(">= 1.5Mbps ("+mbps+"Mbps)")}, function(mbps){console.log("< 1.5Mbps("+mbps+"Mbps)")} )
我成功地使用它来加载低分辨率的媒体慢网络连接。你必须玩一点,因为一方面,图像越大,测试就越合理,另一方面,对于慢速连接,测试将花费更长的时间,在我的情况下,我特别不希望慢速连接的用户加载大量mb。
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