jquery ajax跨域

JSONP是一个非官方的协议，它允许在服务器端集成Script tags返回至客户端，通过javascript callback的形式实现跨域访问

方法一： jsonp之 getJSON

js

var url = "http://localhost/mytest/jsonp_php.php?callback=?";
$.getJSON(url, {
    "age": 21,
    "name": "kitty"
}, function (data) {
    alert("name:" + data.name + ", age:" + data.age);
});

php

<?php 
    $age=$_GET["age"];
    $name=$_GET["name"];
    $jsondata = "{age:$age, name:'$name'}";  
    echo $_GET['callback'].'('.$jsondata.')'; 
?>

二jsonp之$.ajax

js

$.ajax({
	    type: 'GET',
	    url: 'http://localhost/mytest/jsonp_php.php',
	    dataType: "jsonp",
	    jsonp: "callback5",
	    jsonpCallback:"flightHandler",
	    data: {
	        "age": 21,
	        "name": "kitty"
	    },
	    success: function (data) {
	        alert("name:" + data.sd + ", age:" + data.aa)
	    }
	})

 php

<?php 
    $age=$_GET["age"];
    $name=$_GET["name"];
    $ary=array("sd"=>"sdfg","aa"=>23);
     $jsondata=json_encode($ary);
    echo $_GET['callback5'].'('.$jsondata.')'; 
?>