解决在火狐中不支持onreadystatechange的方法

用window.addEventListener来对FF进行控制，如举个例子在IE下onreadystatechange可以监听事件，但在FF下不支持onreadystatechange，解决方法是做个判断，FF下就用window.addEventListener来监听事件，IE下就用onreadystatechange就可以了，代码例子如下：

    public static string GetShowAlert(string strInfo)
        {
            string strScript = String.Empty;
            strScript = "<script language=javascript> \r\n";
            strScript += "if(window.addEventListener)\r\n";
            strScript += "{\r\n";
            strScript += "alert('" + strInfo.Replace("'", "").Replace("\n", "").Replace("\r", "") + "');\r\n";
            strScript += "}\r\n";
            strScript += "else\r\n";
            strScript += "{\r\n";
            strScript += "document.onreadystatechange = ShowAlert;\r\n";
            strScript += "function ShowAlert() \r\n";
            strScript += "{\r\n";
            strScript += "if(document.readyState == \"complete\") \r\n";
            strScript += "{\r\n";
            strScript += "alert('" + strInfo.Replace("'", "").Replace("\n", "").Replace("\r", "") + "');\r\n";
            strScript += "}\r\n";
            strScript += "}\r\n";
            strScript += "}\r\n";
            strScript += "</script>";
            return strScript;
        }