Ajax usage examples in JavaScript analysis _javascript skills

The examples in this article describe Ajax usage in JavaScript. Share to everyone for your reference. The specific analysis is as follows:

To obtain XMLHttpRequest objects in a compatible way:

var xhr = null; 
if (window. XMLHttpRequest) {//non ie browser 
  xhr = window. XMLHttpRequest; 
} else if (window. ActiveXObject) {//ie browser 
  try{   //high version, supported by msxml3.dll+ 
    XHR = new ActiveXObject ("Msxml2.xmlhttp"); 
  } catch (e) { 
    try{  //Low version, msxml2.6 the following version uses 
     XHR = new ActiveXObject ("Microsoft.XMLHTTP"); 
    catch (e) { 
     alert ("IE browser cannot create ActiveXObject Object!") "); 
    } 
  } 
}

Ajax processing functions:

Xhr.open ("POST", url,true); 
Xhr.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); 
Xhr.onreadystatechange=statechangehandler; 
Xhr.send (); var name= "CLF"; Xhr.send (name); 
function Statechangehandler () { 
  if (xhr.readystate==4&&xhr.status==200) { 
   var obj = document.getElementById ("Targetdiv"); 
  obj.innerhtml = Xhr.responsetext; 
  } 

I hope this article will help you with your JavaScript programming.