码间练习

window.onerror = handleError
function handleError(msg, url, l) {
    var txt = "There was an error on this page.\n\n";
    txt += "Error: " + msg + "\n";
    txt += "URL: " + url + "\n";
    txt += "Line: " + l + "\n\n";
    txt += "Click OK to continue.\n\n";
    alert(msg);
    return true;
}