javascript 404请求状态检查

Posted 2021-05-03

var url = 'https://mapsengine.google.com/map/embed?mid=zGLD-nMIJQAg.k0gTyNlOPz_Q';
function UrlExists(url) {
    var http = new XMLHttpRequest();
    http.open('HEAD', url, false);
    http.send();
    if (http.status != 404)
        //  do something
    else
        window.location.reload();
}