前台后台$.psot交互

<script>
    function dologin() {

        var username = $("input[name=‘username‘]").val();
        var password = $("input[name=‘password‘]").val();
        if (username == ‘‘) {
            $("#infoerror").text(‘请填写用户名‘);

            return;
        }
        if (password == ‘‘) {
            $("#infoerror").text(‘请填写密码‘);

            return;
        }
        var data = {
            ‘username‘: username,
            ‘password‘: password
        };
        $.post("{:url(‘check‘)}", data, function (res) {
            if (res.code == 0) {
                $("#infoerror").text(res.msg);
                return;
            } else if (res.code == 1) {
                layer.msg(res.msg);
                setTimeout("location.href=‘{:url(‘home/index‘)}‘", 500);
            }
        }, ‘json‘);
    }
</script>

    public function check()
    {
        $username = trim(input(‘post.username‘));
        $password = trim(input(‘post.password‘));
        if(!$username){
            exit(json_encode(array(‘code‘=>0,‘msg‘=>‘请填写用户名‘)));
        }
        if(!$password){
            exit(json_encode(array(‘code‘=>0,‘msg‘=>‘请填写密码‘)));
        }
        //从数据库查询到数组
        $data = Db::table(‘admin‘)->where(‘username‘,$username)->find();

        //如果查到为空
        if(!$data){
            exit(json_encode(array(‘code‘=>0,‘msg‘=>‘用户名不存在‘)));
        }

        //如果密码匹配
        if($data[‘password‘] != md5($username.$password)){
            exit(json_encode(array(‘code‘=>0,‘msg‘=>‘密码错误‘)));
        }
        //验证通过
        //设置session
        Session::set(‘admin‘,$data);
        exit(json_encode(array(‘code‘=>1,‘msg‘=>‘登录成功‘)));
    }