JOSN初级使用的一个例子

<?php
if($_GET["action"]=="getdata")
{
	//$a=array("title"=>"quciks");
	echo '{ "questionid":"1178",
			"title":"quick speach888",
			"a":"1995yeahs",
			"b":"ten words",
			"c":"",
			"d":"",
			"userid":"0",
			"right":"1",
			"username":"",
			"categoryid":"1",
			"color":"red",
			"tsjifen":"0",
			"catelog_id":"29",
			"is_pass":"1",
			"flag":"0"}';
	//echo json_encode($a);
	exit;
}
?>
<script language=javascript src="jquery.js"></script>
<SCRIPT LANGUAGE="JavaScript">
<!--
$(document).ready(function() {
	$.ajax({
		type: "get",//使用get方法访问后台
		dataType: "json",//返回json格式的数据
		url: "json.php?action=getdata",//要访问的后台地址
		success: function(msg){
		alert(msg.title);
		}
	})
})
//-->
</SCRIPT>