结合Ajax做地区内容切换！（城市切换）

实现原理：点击，进行异步保存Cookie , 根据保存的Cookie来切换城市内容：

简单HTML示例：

<!doctype html>
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>
<title>标题</title>
<meta name='Keywords' content=''>
<meta name='Description' content=''>
<style type='text/css'>
div{width: 500px; margin:60px auto;}
</style>
</head>
<body>
<div>
    <a href="javascript:;" data-city='km'>昆明</a>
    <a href="javascript:;" data-city='qj'>曲靖</a>
    <a href="javascript:;" data-city='hh'>红河</a>
</div>
<script src="https://cdn.bootcss.com/jquery/1.8.3/jquery.min.js"></script>
<script type='text/javascript' >
(function(){
    var city = '';
    $('div>a').click(function(){
        city = $(this).data('city');
        var url = "{:U('Jiami/cuncookie')}";
        $.post(url,{city:city},function(data){
            if(data){
                window.location.reload();
            };
        });
    });
})();
</script>
</body>
</html>

控制器示例：

<?php
namespace HomeController;
use ThinkController;

class JiamiController extends Controller {
    public function index(){
      $where = array();
      //取cookie
      $cookieData = $_COOKIE['city'];
      $cookieData = encrytion($cookieData,0);
      if($cookieData){
        $where['chengshi'] = $cookieData;
      }
      $obj = D('DiquView')->where($where)->field('title')->select();
      p($obj);     
      $this->display();
    }
    public function cuncookie(){
      $value = I('post.city');
      //加密
      $city = encrytion($value,1);
      $res = @setcookie('city',$city,C('COOKIE_LOGIN_TIME'),'/');
      echo $res;
      //解密
      //$city = encrytion($city,0);
      //echo $city;
    }
}