Jquery 跨域取数据--$.ajax 和$.getJSON

一般跨域用到的两个方法为：$.ajax 和$.getJSON

比如PHP处理如下：

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

define('APPID', 'wx04369bbf9676b462');
define('APPSECRET', 'ba58586bd757486765d774f40326c6f5');

/*
 * JS安全接口授权
 * @author czt20160413
 */
class Jsapisign extends CI_Controller{
    public function __construct(){
        parent::__construct();
    }
    
    public function index(){
        header("Access-Control-Allow-Origin:*");//允许跨域才可以进行
        
        $time_stamp = time();
        $jsapi_ticket = $this->wxinterface->getJsApiTicket(APPID, APPSECRET);
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? 'https://' : 'http://';
        $url = $protocol.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
        $nonce_str = createNonceStr();
        $signature_str = getSignature($jsapi_ticket, $url, $time_stamp, $nonce_str);
        
        $data['appid'] = APPID;
        $data['timestamp'] = $time_stamp;
        $data['noncestr'] = $nonce_str;
        $data['signature'] = $signature_str;
        $data['url'] = $url;
        
        ajax($data);
    }
}

获取链接为：http://wx.5usport.com/Jsapisign

JS写法为：

<script>
$(function(){
  $.getJSON("http://wx.5usport.com/Jsapisign",
    function (data) {
        alert(data.appid);
    }
);
})
</script>

这样就能获取到json里面的数据了，真好,以后可以经常这样用啦，