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Símbolos y reinos cruzados

Encontré este ejemplo en Internet para comprender los reinos cruzados y los Símbolos, sin embargo, no obtengo el resultado que dice el artículo (ambos se imprimen como falsos), ¿estoy replicando el ejemplo de manera incorrecta? Quiero probarlo porque quiero aprender sobre Símbolos y reinos cruzados.

 <body> <iframe srcdoc="<script>var sharedSymbol = Symbol.for('Shared symbol');</script>"></iframe> <script> const iframe = document.querySelector("iframe"); const iframeWindow = iframe.contentWindow; // Will print false! console.log(iframeWindow.Symbol === Symbol); // But will print true! console.log(iframeWindow.sharedSymbol === Symbol.for("Shared symbol")); </script> </body>
about 4 years ago · Juan Pablo Isaza
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