内嵌时指定域名可访问书籍

书本A： 指定 online.flipbuilder.com 可访问

书本A在此
<iframe id="flipbook-iframe-1760077367952" src="https://online.flipbuilder.com/melo/ilkx/?#p=1" style="width:700px;height:400px" seamless="seamless" scrolling="no" frameborder="0" allowtransparency="true" allowfullscreen="true" ></iframe><script>var iframe = document.getElementById('flipbook-iframe-1760077367952');iframe.onload = function () {iframe.contentWindow.postMessage({type: 'PARENT_DOMAIN',domain: window.location.hostname},'*')}</script>

书本B： 指定 https://cms.flip-book-maker.com/ （当前网站域名）可访问

书本B 在此