检查设备是否有Internet访问权限的最佳方法是什么？ [英] What is the best way to check if the device has Internet access?

问题描述

我想检查设备是否具有互联网访问。从官方cordova文档：

I want to check if the device has internet access. From the official cordova documentation:

这段代码只是获取连接类型

function checkConnection() {
    var networkState = navigator.connection.type;

    var states = {};
    states[Connection.UNKNOWN]  = 'Unknown connection';
    states[Connection.ETHERNET] = 'Ethernet connection';
    states[Connection.WIFI]     = 'WiFi connection';
    states[Connection.CELL_2G]  = 'Cell 2G connection';
    states[Connection.CELL_3G]  = 'Cell 3G connection';
    states[Connection.CELL_4G]  = 'Cell 4G connection';
    states[Connection.CELL]     = 'Cell generic connection';
    states[Connection.NONE]     = 'No network connection';

    alert('Connection type: ' + states[networkState]);
}

checkConnection();

但是如何检查设备是否真的可以上网？也就是说，因为可能是设备使用WiFi连接类型连接到路由器，但是它不能访问互联网而只能访问本地访问。在这种情况下， checkConnection（）; 将返回： WiFi连接。

But how can I check if the device really have internet access? That is, because it may be that the device is connected to a router using a WiFi connection type, but that it has no access to internet but only local access. In this case the checkConnection(); will return: WiFi connection.

或者是连接到3G网络电话运营商，但用户没有足够的信用额度用于互联网。在这种情况下， checkConnection（）; 将返回： Cell 3G连接

Or that is connected to a 3G network phone operator, but the user does not have sufficient credits for the internet. In this case the checkConnection(); will return: Cell 3G connection

但是在这两种情况下，用户都没有真正的互联网访问事件，如果连接。

But in both cases the user have not a real internet access eventhough if connected.

我认为唯一的事情是ping google或其他服务器在州[networkState]！=没有网络连接

The only thing that I think is to ping google or another server to check if there really has internet access, in the case of states[networkState] != No network connection

的情况下检查是否真的有互联网连接你认为 navigator.onLine 可以在所有设备（Android，iOS，BlackBery 10？）上运行吗？

Or do you think navigator.onLine can run on all devices (Android, iOS, BlackBery 10?

推荐答案

这里是一个讨论 http://iswwwup.com/t/f3e5374b74ca/android-cordova-plugin-to -detect-internet-connection.html

他们提到的解决方案...

And the solution they mentioned...

测试此地址以检查设备是否可以访问互联网的功能如下：

A function to test this address to check if the device has access to internet would look like this :

function testInternet(win,fail){
    $.get("http://www.google.fr/blank.html").done(win).fail(fail);
}
Or ,

function testInternet(win,fail){
    $.ajax({
         url:"http://www.google.fr/blank.html",
         timeout:5000,   //timeout to 5s
         type: "GET",
         cache: false
       }).done(win).fail(fail); 
}

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