Summary of the differences between Js+Ajax Get and Post in use

The biggest difference between the get and post methods is that:

1.The get method pass-through parameter is in url, while the post parameter is in send

2. The post method must be added

xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

The following example shows the get method

xmlHttp.open("GET","for.php?text="+url,true); 

In post it is shown as:

xmlHttp.open("POST","for.php",true); 
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

POST and GET methods share files

index.php

<script src="a.js" type="text/javascript"></script>
<a href="#" onClick="funphp100('o')">o</a>
<a href="#" onClick="funphp100('t')">t</a>
<a href="#" onClick="funphp100('x')">x</a>
<div id="php100"></div>

POST method file:

a.js

var xmlHttp;    
function S_xmlhttprequest(){ 
 if(window.ActiveXObject){ 
 xmlHttp=new ActiveXObject('Microsoft.XMLHTTP');
 }else if(window.XMLHttpRequest){ 
  xmlHttp=new XMLHttpRequest();
  }
 }
 
function funphp100(n){
var data = "text=" +n; * // Multiple parameters, followed by 
 S_xmlhttprequest();
xmlHttp.open("POST","for.php",true); 
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
 xmlHttp.onreadystatechange=byphp;
 xmlHttp.send(data);
 }
 
function byphp(){
var byphp100=xmlHttp.responseText;
document.getElementById("php100").innerHTML=byphp100;
 }

for.php:

<?
echo $_POST['text'];
?>

GET method file:

a.js:

var xmlHttp;    
function S_xmlhttprequest(){ 
 if(window.ActiveXObject){ 
 xmlHttp=new ActiveXObject('Microsoft.XMLHTTP');
 }else if(window.XMLHttpRequest){ 
  xmlHttp=new XMLHttpRequest();
  }
 }
 
 
function funphp100(url){
 S_xmlhttprequest();
xmlHttp.open("GET","for.php?text="+url,true); 
 xmlHttp.onreadystatechange=byphp; 
 xmlHttp.send(null);
 }
 
function byphp(){
var byphp100=xmlHttp.responseText;
document.getElementById("php100").innerHTML=byphp100;
 }

for.php:

<?
echo $_GET['text'];
?>