nodejs检测因特网是否断开的解决方案

window.addEventListener('online', ...)
window.addEventListener('offline', ...)

var internetAvailable = require("internet-available");

internetAvailable().then(function(){
 console.log("Internet available");
}).catch(function(){
 console.log("No internet");
});

var internetAvailable = require("internet-available");

internetAvailable({
 timeout: 4000,
 retries: 10,
}).then(function(){
 console.log("Internet available");
}).catch(function(){
 console.log("No internet");
});

var internetAvailable = require("internet-available");

internetAvailable({
 domainName: "xxxxx.com",
 port: 53,
 host: '8.8.8.8' // 默认，国内请改成114.114.114.114
}).then(() => {
 console.log("Internet available");
}).catch(() => {
 console.log("No internet");
});

const isOnline = require('is-online');
 
isOnline().then(online => {
 if(online){
 console.log("We have internet");
 }else{
 console.log("Houston we have a problem");
 }
});

var isOnline = require('is-online');
 
isOnline({
 timeout: 5000,
 version: "v4" // v4 or v6
}).then(online => {
 if(online){
 console.log("Internet available");
 }else{
 console.log("No internet");
 }
});