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
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。
其他回答
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。
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。
改进了John Smith的答案，一个漂亮而干净的解决方案，返回一个Promise，因此可以与async/await一起使用。返回以Mbps为单位的值。
const imageAddr = 'https://upload.wikimedia.org/wikipedia/commons/a/a6/Brandenburger_Tor_abends.jpg';
const downloadSize = 2707459; // this must match with the image above
let startTime, endTime;
async function measureConnectionSpeed() {
startTime = (new Date()).getTime();
const cacheBuster = '?nnn=' + startTime;
const download = new Image();
download.src = imageAddr + cacheBuster;
// this returns when the image is finished downloading
await download.decode();
endTime = (new Date()).getTime();
const duration = (endTime - startTime) / 1000;
const bitsLoaded = downloadSize * 8;
const speedBps = (bitsLoaded / duration).toFixed(2);
const speedKbps = (speedBps / 1024).toFixed(2);
const speedMbps = (speedKbps / 1024).toFixed(2);
return Math.round(Number(speedMbps));
}
As I outline in this other answer here on StackOverflow, you can do this by timing the download of files of various sizes (start small, ramp up if the connection seems to allow it), ensuring through cache headers and such that the file is really being read from the remote server and not being retrieved from cache. This doesn't necessarily require that you have a server of your own (the files could be coming from S3 or similar), but you will need somewhere to get the files from in order to test connection speed.
也就是说，时间点带宽测试是出了名的不可靠，因为它们会受到其他窗口中正在下载的其他项目、服务器的速度、路由中的链接等的影响。但是你可以用这种方法得到一个大致的概念。
好吧，现在是2017年，所以你现在有网络信息API(尽管目前跨浏览器的支持有限)来获得某种估计的下行速度信息:
navigator.connection.downlink
这是以Mbits / sec为单位的有效带宽估计。浏览器根据最近观察到的应用程序层在最近活动连接上的吞吐量进行估计。不用说，这种方法的最大优点是，您不需要下载任何内容，只是为了带宽/速度计算。
你可以看看这个和其他一些相关的属性
由于它的支持有限，并且跨浏览器的实现不同(截至2017年11月)，强烈建议详细阅读这篇文章
