记录下jQuery Ajax今天终于学会了！Ajax实例代码

   $(document).ready(function(){
    $('#click').click(function(){
       var imgid=$('img').attr('id');
        $.ajax({
           type:"POST",
           url: "get-ajax.php",
           data:"id="+imgid,
           datatype: "json",
           timeout: 5000,
           error: function(){
          alert('ajax error!');
          },
         success:function(data){
          if(data!=""){
           //alert(data);
          $("#bigimg").attr("src",data);
          }
           }
        
   });       
    })
    });
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html代码：
<div id="click"><img src="images/phone.jpg" id="1"></div>
<img src="images/logo2.jpg" id="bigimg">
get-ajax.php文件代码
<?php
include 'config.php';
//这里是获取的如同$_POST[]
$id=$sr->request('id','int','post');
$sql = "select * from `banner` where id = $id";
$rs = $db->query($sql);
echo $rs[0]['image_url'];
?>