js+Ajax,Get和Post在使用上的区别

get和post方法最大的不同在于:

1.get方法传值参数在url里面,而post参数放send里面

2.post方法必须加上

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

下面实例可以看get方法

 

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

 

在post里面表现为:

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

 

POST和GET方法共用文件

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方法文件:

 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;  //多个参数的,往后加
 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方法文件:

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'];
?>

 >>>>>>>下载实例

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