📅  最后修改于: 2022-03-11 15:04:02.628000             🧑  作者: Mango
let formChanged = false;
myForm.addEventListener('change', () => formChanged = true);
window.addEventListener('beforeunload', (event) => {
if (formChanged) {
event.returnValue = 'You have unfinished changes!';
}
});