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並前往https://www.telerik.com/support/kb/wpf/details/resize-images-client-side-with-html5-before-uploading-with-radasyncupload

Resize images client-side with HTML5 before uploading with ...

var ctx = canvas.getContext( "2d" );. ctx.drawImage(img, 0, 0);. var MAX_WIDTH = 400;. var MAX_HEIGHT = 100;. var width = img.width;.

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