canvas的drawImage的问题，ctx使用canvas.getContext就报错？ CanvasRenderingContext2D.createImageData() - Web APIs | MDN Failed to execute ‘drawImage‘ on ‘CanvasRenderingContext2D‘: … at draw_background_img (jquery-qrcode-0.17.0.js:220:11) at draw_background (jquery-qrcode-0.17.0.js:236:5) at draw_on_canvas (jquery-qrcode-0.17.0.js:387:3) at create_canvas (jquery … Example. The canvas contains or may contain pixels which were loaded from an origin other than the one from which the document itself was loaded. To avoid SecurityError being thrown in this situation, configure CORS to allow the source image to be used in this way. See Allowing cross-origin use of images and canvas. 端就可以了。服务端实现简单但存在一个缺点-：实时性不高。经常抓到的图是数秒以后的图片。 其 … 二、Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D'： 問題： Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D'：The HTMLImageElement provided is in the 'broken' state.

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