检测navigator.online上的更改 [英] detect change on navigator.online

问题描述

如何检测导航器是否将您的状态更改为在线/离线？

How can I detect if the navigator changed your state to online/offline?

类似于：

var oldState = navigator.onLine; 
window.navigator.onlinechange = function(evnt,newState) { 
         alert('your changed from' + oldState + ' to' + newState + 'state');
}

推荐答案

这样的事情（不是每一件事）浏览器支持这些事件，目前只有IE 8,9和FF> 3支持这些事件）：

Something like this (not every browser supports these events, currently only IE 8,9 and FF > 3 support these events):

var el = document.body;
if (el.addEventListener) {
   el.addEventListener("online", function () {
     alert("online");}, true);
   el.addEventListener("offline", function () {
     alert("offline");}, true);
}
else if (el.attachEvent) {
   el.attachEvent("ononline", function () {
     alert("online");});
   el.attachEvent("onoffline", function () {
     alert("offline");});
}
else {
   el.ononline = function () {
     alert("online");};
   el.onoffline = function () {
     alert("offline");};
}

浏览器支持各不相同，请查看： http://help.dottoro.com/ljnasgpu.php

The browser support varies, check this out: http://help.dottoro.com/ljnasgpu.php

这篇关于检测navigator.online上的更改的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！