js使用iframe 嵌套禅道一直报错

禅道版本：

代码：

<iframe class="ifr" id="ifr" scrolling="no" frameborder="0" sandbox="allow-same-origin allow-top-navigation allow-scripts allow-forms allow-modals allow-orientation-lock allow-pointer-lock allow-popups allow-popups-to-escape-sandbox allow-presentation"></iframe> 

请教一下是我哪里还少配了吗，还是说禅道本身不允许iframe嵌套的