1.屬性 navigator.onLine 線上傳回true/離線傳回false
2.事件
//線上回調函數
window.addEventListener('online', function(e){console.log('online')});
//離線回調函數
window.addEventListener('offline', function(e){console.log('offline');});
1.屬性 navigator.onLine 線上傳回true/離線傳回false
2.事件
//線上回調函數
window.addEventListener('online', function(e){console.log('online')});
//離線回調函數
window.addEventListener('offline', function(e){console.log('offline');});