javascript - 计算 WiFi 带宽或 WiFi 信号强度

Question

我想使用 jQuery 或 JavaScript 计算 WiFi 带宽或 WiFi 信号强度。我知道我们可以在服务器端代码上计算强度，但我想在客户端上计算。

Answer 1

检查这个网站，我认为这适合 WiFi 连接:

http://www.wiseloop.com/demo/javascript-bandwidth-tester

以下是加载图像时计算下载速度的示例:

var imageAddr = "http://www.tranquilmusic.ca/images/cats/Cat2.JPG" + "?n=" + Math.random();
var startTime, endTime;
var downloadSize = 5616998;
var download = new Image();

download.onload = function() {
  endTime = (new Date()).getTime();
  showResults();
}

startTime = (new Date()).getTime();
download.src = imageAddr;

function showResults() {
  var duration = (endTime - startTime) / 1000; //Math.round()
  var bitsLoaded = downloadSize * 8;
  var speedBps = (bitsLoaded / duration).toFixed(2);
  var speedKbps = (speedBps / 1024).toFixed(2);
  var speedMbps = (speedKbps / 1024).toFixed(2);
  alert("Your connection speed is: \n" +
    speedBps + " bps\n" +
    speedKbps + " kbps\n" +
    speedMbps + " Mbps\n");
}