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並前往https://openlayers.org/en/latest/examples/offscreen-canvas.html

Vector tiles rendered in an offscreen canvas - OpenLayers

... Worker provies a new render frame requestAnimationFrame(function () { const imageData = message.data.imageData; canvas.width = imageData.width; ...

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查詢 「New ImageData」的人也找了：

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  8. Parameter 1 is not of type imagedata
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