ajax与php交互的get和post两种实现方式

初始化ajax对象 InitAjax.js

/* 初始化一个xmlhttp对象 */
function InitAjax(){//ajax初始化
   var ajax=false;
   try{
       ajax=new ActionXObject("Msxml2.XMLHTTP");
   }catch(e){
       try{
           ajax=new ActionXObject("Miscrosoft.XMLHTTP");
       }catch(e){
           ajax=false;
       }
   }
   if(!ajax&&typeof XMLHttpRequest!='undefined'){
       ajax=new XMLHttpRequest();
   }
   return ajax;
}

===================================

调用页面 index.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>

<script src="InitAjax.js" type="text/javascript"></script>

<script type="text/javascript">

//获取新闻(AJAX的GET方式)
function getNews(newsID)
{
   //如果没有把newsID参数传过来
   if(typeof(newsID) == 'undefined')
   {
       return false;
   }

   var url = "show.php?tag=show&></div>
</body>
</html>

============================

服务端执行页面 show.php

<?php
include_once 'DB.class.php';
$tg = new DB('localhost', 'root', 'wangxiang', 'fenghua', 'UTF8');

if($_GET[tag]=='show')
{
   $sql = "SELECT Id, title from news limit 0," . $_GET[id];
   mysql_query("set names 'utf8'");
   $item = $tg->getAll($sql);

   sleep(1); //暂停1秒

   for($i=0; $i<count($item); $i++)
   {
       echo "<a href=news.php?nid={$item[$i]['Id']}>{$item[$i]['title']}</a><br>";
   }
}
else if($_GET[tag]=='add')
{
   sleep(2);//暂停2秒
   if($_POST[user_name] != '' && $_POST[user_age] != '' && $_POST[user_sex] != '')
   {
       $sql = "insert into news (title, pic_path, content) values ('".$_POST[user_name]."', '".$_POST[user_age]."', '".$_POST[user_sex]."')";
       mysql_query("set names 'utf8'");
       $insert_id = $tg->insert($sql);

       if($insert_id > 0)
       {
           echo "插入成功!";
       }
   }
   else
   {
       echo "资料填写不全";
   }
}
?>