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function send_request(callback, urladdress, isReturnData){
var xmlhttp = getXMLHttpRequest();
xmlhttp.onreadystatechange = function(){
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try{
if(xmlhttp.status == 200){
if(isReturnData && isReturnData==true){
callback(xmlhttp.responseText);
}
}else{
callback("±§Ç¸£¬Ã»ÕÒµ½´ËÒ³Ãæ:"+ urladdress +"");
}
} catch(e){
callback("±§Ç¸£¬·¢ËÍÇëÇóʧ°Ü£¬ÇëÖØÊÔ " + e);
}
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var StrType;
function checkUsers(StrTmp)
{
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StrType=StrTmp
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