打开js/pw_ajax.js，找到以下代码：

load : function() {   
if (is_ie) {   
ajax.request.responseText = (typeof ajax.request.iframe.contentWindow.document.XMLDocument != 'undefined') ? ajax.request.iframe.contentWindow.document.XMLDocument.text : null;   
ajax.request.iframe.detachEvent('onload',ajax.load);   
} else {   
ajax.request.responseText = ajax.request.iframe.contentWindow.document.documentElement.firstChild.nodeValue;   
ajax.request.iframe.removeEventListener('load',ajax.load,true);   
}   
try{if (self.ajaxiframe.location.href == 'about:blank'){return '';}}catch(e){}   
if (typeof(ajax.recall) == 'function') {   
ajax.recall();   
}   
},

替换成如下代码即可：

load : function() {   
if(!ajax.request.iframe.contentWindow){    
return false;    
}    
var _innerText=ajax.request.iframe.contentWindow.document.documentElement.innerText;    
var _textContent=ajax.request.iframe.contentWindow.document.documentElement.textContent;    
  
if(_innerText=="undefined"||_textContent=="undefined"){    
return false;    
}    
if(-[1,]){    
ajax.request.responseText=_textContent;    
}else{    
var txt = ajax.request.iframe.contentWindow.document.documentElement.innerText;    
var rules = /<!\[CDATA\[([\s\S]+)\]\]>/.exec(txt);    
if(rules && rules[1]){    
ajax.request.responseText=rules[1].replace(/^\s+|\s+$/g,'');    
}else{    
ajax.request.responseText=_innerText;    
}    
}    
  
if (ajax.request.iframe.detachEvent) {    
ajax.request.iframe.detachEvent('onload',ajax.load);    
} else {    
ajax.request.iframe.removeEventListener('load',ajax.load,true);    
}    
//try{if (ajax.request.iframe.location.href == 'about:blank'){return '';}}catch(e){}    
if (typeof(ajax.recall) == 'function') {    
ajax.recall();    
ajax.doscript();    
}    
//fixed for tt browser (register page)    
if (typeof ajaxclearhistory == 'undefined')ajax.request.clearhistroy();    
},