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並前往http://man.hubwiz.com/docset/JavaScript.docset/Contents/Resources/Documents/developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL.html

HTMLCanvasElement.toDataURL()

HTMLCanvasElement.toDataURL() · If the height or width of the canvas is 0 , the string "data:," is returned. · If the requested type is not image/ ...

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