示例1

<div class="qrcode" :style="{display: qrcodeShow?'':'none'}"><img src="../assets/images/qrcode.jpg">
</div>

• {display: qrcodeShow?'':'none'} 为JS对象。

示例2

<div class="qrcode" :style="qrcodeStyle"><img src="../assets/images/qrcode.jpg">
</div>
...<script>new Vue({data: {qrcodeStyle:{display: 'none'},}});
</script>

• qrcodeStyle 为JS对象。

参考

https://blog.csdn.net/chyuanrufeng/article/details/107139359
https://www.php.cn/faq/500032.html