修改后的prototype.js 增加进度条和验证输入框

使用示例
<script type="text/javascript" src="../scripts/prototype.js"></script>
<script type="text/Javascript">
var progressBar;
/**//*
* 功能：admin登录
*/
function UserLogin()
{
   
    //验证页面控件
    var checkform = new CheckForm();
    if(!checkform.checkForm(document.getElementById('formLogin'))) return false;   
       
    //开始提交数据
    progressBar = new ProgressBar();
    progressBar.SetStatus("正在发送数据到服务器.");
   
    var url = "../admin.do";
    var pars = "action=Login&username=" + $F('username') + "&passWord=" + $F('password') + "&rnd=" +$F('rnd');
    var myAjax = new Ajax.Request(
    url,
    {method: 'post', parameters: pars, onComplete: UserLogin_CallBack}
    );
}
/**//*
* 功能：admin登录 - CallBack
*/
function UserLogin_CallBack(originalRequest)
{
  var objXML = originalRequest.responseXML;
  //alert(originalRequest.responseTEXT);
  try
  {
    if(objXml.getElementsByTagName("return")[0].firstChild.nodeValue == "true")
    {
      progressBar.isNeedConfirmButton = false;
      progressBar.isNeedProgressBar = true;
      progressBar.SetStatus("<img src=http://www.knowsky.com/images/error.gif align='absmiddle'> 登录成功，正在载入，请稍候..");

      //login sUCcess
      location.href='admin_index.htm';
    }
    else
    {
      progressBar.isNeedConfirmButton = true;
      progressBar.isNeedProgressBar = false;
      progressBar.focusItem = "username";
      progressBar.SetStatus("<img src=http://www.knowsky.com/images/error.gif align='absmiddle'> 对不起，登录失败！" + objXml.getElementsByTagName("msg")[0].firstChild.nodeValue);

      $('BTnOK').disabled = false;

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