Wie erstelle ich einen QR-Code unter dem thinkphp5-Framework? (Code)

<?php
namespace app\index\controller;
use think\Controller;
use think\Loader;

Loader::import(&#39;PhpQrcode.phpqrcode&#39;,EXTEND_PATH,&#39;.php&#39;);

class Index extends Controller
{
    //ajax访问
    //通过链接生成二维码
    public function code($url = "http://www.baidu.com")
    {
        $qrcode = new \QRcode();

        // $qrimage = new \QRimage();

        $value = $url;                    //二维码内容  
        $errorCorrectionLevel = &#39;H&#39;;    //容错级别  
        $matrixPointSize = 6;           //生成图片大小  

        ob_start();
        $qrcode::png($value,false , $errorCorrectionLevel, $matrixPointSize, 2);  
        // $object->png($url, false, $errorCorrectionLevel, $matrixPointSize, 2); //这里就是把生成的图片流从缓冲区保存到内存对象上，使用base64_encode变成编码字符串，通过json返回给页面。
        $imageString = base64_encode(ob_get_contents()); //关闭缓冲区
        ob_end_clean(); //把生成的base64字符串返回给前端 
        $data = array( &#39;code&#39;=>200, &#39;data&#39;=>$imageString ); 
        return json($data);



    }

 
}

<div id="logos">
<button onclick="changess()">点击</button>
  <img src="" class="qrcode" alt="二维码展示"/>

</div>
<script type="text/javascript" src="__INDEX__js/jquery.js"></script>
<script type="text/javascript">

  function changess()
  {
     var logos = document.getElementById (&#39;logos&#39;);
    $.ajax({
             type: "GET",
             url: "code.html",
             data: &#39;&#39;,
             dataType: "json",
             success: function(r){
                        if (r.code==200) { //console.log(r); 
                        var path = &#39;data:image/png;base64,&#39;+r.data; //给img的sec赋值。
                        console.log(path);
                         $("#logos").html("<img src="+path+">");
                        
                         logos.html("<img src="+path+">");
                         console.log( logos.html("<img src="+path+">"));
                       }else{
                            alert(r.err); 
                          }
                      }
         });
  }
</script>