//服务端生成json数据json.php<?php$json=array("Volvo","BMW","SAAB");$cb = $_GET[‘callback‘];echo $cb.‘(‘.json_encode($json, true).‘)‘;?>

//客户端Ajax请求数据
<script>$(document).ready(function() {var url="http://域名/json.php?callback=?"; $.getJSON(url,function(data){ alert(data);});
</script>