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El contexto del lienzo Js da indefinido en el objeto

Así que... tengo este código aquí. Está destinado a obtener el contexto de un lienzo:

 let room ={ canvas: document.getElementById("room"), ctx: this.canvas.getContext("2d") }

pero me da este error: No se puede leer la propiedad de undefined (leyendo 'lienzo'). ¿Por qué?

about 4 years ago · Juan Pablo Isaza
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Intenta definir el lienzo primero

 let cvs = document.getElementById("room"); let room = { ctx: cvs.getContext("2d") }
about 4 years ago · Juan Pablo Isaza Report
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