JS获取循环表格中input的值,该怎么处理

function popUserDetail(x){
    var popUp = document.getElementById("popUserDetail");
  var h = (x.rowIndex)*20;
        popUp.style.top= 25 + h + "px";
        popUp.style.left="142px";
        popUp.style.width="200px";
        popUp.style.height="100px";
        popUp.style.visibility="visible";      
      var customerId = document.getElementsByTagName("input")[0].value;
    alert (customerId);
    }

           while ($records = mysql_fetch_array($rows)) 
              { 
                  $arr = ct($records['uniqueid']);
                  $fileLastUploadTime  = $arr[1];
             
       print       '
                    
                     
                     
                                                        
                         '.st($records['lastT'],$fileLastUploadTime).'
                          '.$records['barName'].'
                          '.$records['lastLogin'].'
                          '.date("Y-m-d H:i:s",$arr[1]).'
                          '.$records['endTM'].'
                          '.$arr[0].'
                          '.$records['version'].'
                          ';
                  } 
 print                  '
                    
                          

                          
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