版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_14852397/article/details/71794649
1. 简单实现网络测速：
实现原理：通过系统服务器上的图片，来计算出当前访问服务的带宽；
注：准确性就不好说了，做此功能也只是想简单的显示给用户参考，请求的系统服务器的当前带宽！
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> 网络测速 </title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Generator" content="EditPlus">
<meta name="Author" content="xinmingyang">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head>
<body>
<!--<div>
单位换算：宽带512kbps=64kb/s - 1M=128kb/s - 2M=256kb/s
</div>-->
<div id="box"></div>
</body>
<script>
setInterval("getSpeed()", 1000);
function getSpeed(){
var startTime = new Date().getTime();
var img = new Image();
img.src = "http://127.0.0.1:80/web/resources/img/bandwidth.jpg?timeStamp=" + startTime;
img.onload = function(){
// 图片大小
var size = 204.94 * 1000;
var endTime = new Date().getTime();
var speed = parseInt(size / (endTime - startTime));
var unit = "KB/S";
if(speed >= 1024){
speed = (speed / 1024).toFixed(2);
unit = "MB/S";
}
document.getElementById("box").innerHTML = "当前带宽："+ speed + unit + "<br/>请求用时：" + (endTime - startTime) / 1000 + "s";
};
}
</script>
</html>