Javascript Logging (Server & Client)

gistfile1.js

//  client side logging
    window.console = window.console || function () { var a = ["log", "debug", "info", "warn", "error", "assert", "dir", "dirxml", "group", "groupEnd", "time", "timeEnd", "count", "trace", "profile", "profileEnd"]; window.console = {}; for (var b = 0; b < a.length; ++b) window.console[a[b]] = function () { } } ();

//  server side logging
   window.onerror = function (msg, url, line) {
        if (encodeURIComponent && window.XMLHttpRequest && window.navigator) {
            try {
                var req = new XMLHttpRequest();
                var params = "agent=" + navigator.userAgent + "&line=" + line + "&msg=" + msg + "&url=" + encodeURIComponent(url);
                req.open("POST", "/LogJs.aspx", true);
                req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
                req.setRequestHeader("Content-length", params.length);
                req.setRequestHeader("Connection", "close");
                req.send(params);
            } catch (e) { }
        }
        return false;
    };