js get the project root path

function getRootPath() {
    var pathName = window.location.pathname.substring(1);
var webName = pathName == '' ? '' : pathName.substring(0, pathName.indexOf('/'));
if (webName == '') {
        return window.location.protocol + '//' + window.location.host + '/';
} else {
        return window.location.protocol +             '//' + window.location.host + '/' + webName + '/' ;
    }
}