JavaScript sends Ajax request instance code _javascript tips

An encapsulation of Ajax

URL is the address of the request
//successfunc is a function after the success of a request return, there is a parameter, the argument is the return of the server style
function ajax (URL,SUCCESSFUNC)
{
 var xhr = window. XMLHttpRequest? New XMLHttpRequest (): New ActiveXObject (' microsoft.xmlhttp ');
 Xhr.open ("POST", url,true);
 Xhr.onreadystatechange = function () {
  if (xhr.readystate = 4)
  {
   if (Xhr.status =)
   {
    Successfunc (Xhr.responsetext);
   }
   else
   {
    alert ("Server returns an error!") ");
   }
  }
 };
 Xhr.send ();
}

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