本文介绍了有没有一种方法可以检测手机和手持设备上的3G和2G连接速度?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
有没有办法检测手机和手持设备上的3G和2G连接?
Is there a way to detect 3G and 2G connections on mobile phones and handheld devices?
就像我想在用户使用3G时提供高端网站，而在用户使用2G时提供高度优化的版本一样.
Like If I want to deliver High-end Website when user is on 3G and Highly optimized version if user is on 2G.
推荐答案
在Android 2.2及更高版本中，有一个JS对象.
In Android 2.2+ there's a JS object for that.
您可以根据连接类型写出一个供CSS使用的类.但据我所知，iOS在移动网站上不可用.
You can write out a class for CSS use based on connection type.But it's not available on iOS for mobile web sites as far as I know.
var connection, connectionSpeed, htmlNode, htmlClass;
connection = navigator.connection || {"type":"0"}; // fallback
switch(connection.type) {
case connection.CELL_3G: connectionSpeed = "mediumbandwidth"; break;
case connection.CELL_2G: connectionSpeed = "lowbandwidth"; break;
default: connectionSpeed = 'highbandwidth';
}
/* set the connection speed on the html element
i.e. <html class="lowbandwidth">
*/
htmlNode = document.body.parentNode;
htmlClass = htmlNode.getAttribute("class") || "";
htmlNode.setAttribute("class", htmlClass + " " + connectionSpeed);
此代码来自此演示文稿中的幻灯片24:
http://davidbcalhoun.com/present/mobile-performance/
The code is from slide 24 in this presentation:
http://davidbcalhoun.com/present/mobile-performance/
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