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function requestSome()
{
  url=......
  xmlHttpRequest.open....
  xmlHttpRequest.onreadystatechange = function responseSome();
  xmlHttpRequest.send....
}
function responseSome()
{
  if(xmlHttpReqeust.readyState == 4)
  {
    alert(xmlHttpRequest.responseText);
    .....
    .....
  }
}
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var x,y;
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   //¼Ç¼Ê¼þ·¢ÉúʱµÄÊó±êλÖÃ
   x = event.clientX;
   y = event.clientY; 
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   document.getElementById(" ......

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