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.')';
?>