1. jsonp - 对方服务器支持

2. 自己搭个服务器做中转 - 分两次操作

3. Access-Control-Allow-Origin - 也要对方服务器支持

所以如果服务器不是自己搭建或者无法做改动，请用第二种

用FlyJSONP应用JSONP实现

服务器代码

<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
    
    public $callback;
    public $model;

    public function __construct() {
        parent::__construct();
        $this->callback = I('callback');
        if(!$this->callback) $this->error('系统出错，请稍后再试');
        $this->model = D('Posts');
    }


    
    public function man(){
        $page = I('page',0,'intval');
        $where = array();
        $where['post_status']='publish';
        $where['ping_status']='open';
        $where['post_password'] = '';
        $where['post_type'] = 'post';
        $where['post_date'] = array('lt',date('Y-m-d H:i:s'));
        $row_num = C('row_num');
        $field = 'a.ID,a.post_date,a.comment_count,a.post_title,a.post_excerpt,b.display_name';
        $data=$this->model->alias('a')->join('__USERS__ as b on a.post_author=b.ID')->field($field)->where($where)->order('post_date desc')->limit($page*$row_num ,$row_num )->select();
        $this->jsonp($data);
    }

    public function post(){
        $where = array();
        $where['post_status']='publish';
        $where['ping_status']='open';
        $where['post_password'] = '';
        $where['post_type'] = 'post';
        $where['post_date'] = array('lt',date('Y-m-d H:i:s'));
        $id = I('id');
        $where['ID'] = $id;
        $data=$this->model->where($where)->field('post_title,post_content')->find();
        $data['post_content'] = wpautop($data['post_content']);

        $this->jsonp($data);
    }

    private function jsonp($data){
        echo $this->callback.'('.json_encode($data).')';
        die;
    }

}

客户端请求

/**
 * jsonp请求
 * @param url
 * @param post_data
 */
function ajax(url){
    var postdata =  arguments[1] ? arguments[1] : null;
    var success = arguments[2] ? arguments[2] : null;
    var error = arguments[3] ? arguments[3] : null;

    $.ajax({
        type: "post",
        async: false,
        data:postdata,
        url: url,
        dataType: "jsonp",
        jsonp: "callback",//传递给请求处理程序或页面的，用以获得jsonp回调函数名的参数名(一般默认为:callback)
        jsonpCallback:"callback",//自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名，也可以写"?"，jQuery会自动为你处理数据
        success: function(data){
            (success && typeof (success) == "function") && success(data);
        },
        error: function(){
            if(!error)msg('数据加载失败');
            (error && typeof (error) == "function") && error(data);
        }
    });

}

ajax(root+"/Index/man",null,function(data){
            //var tmp = template(tpl.get('list'),{data:data});
            var tmp = template(tpl.get('list'),{data:data});
            $(this.el).html(tmp);
            console.log(t);
            return t;
        });