JavaScript? ?? ??? ????? Base64? ???? ??? ???? ??? ?? ? ?????
Dec 15, 2024 pm 10:56 PM
JavaScript?? ??? ??? URL ??
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base64-? ??? ?? ? ???? HTML ??? ???? ????? ?? ??? ???? ???? ??? ?? ???????????
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Greasemonkey ? Firefox? ???? ??? ??? ???? ???? ????? ?? ??? ?????.
- ??? ???: ???? ???? ??? ??? ??? ?????. size.
- ??? ??? ??: drawImage ??? ???? ??? ???? ???? ?????.
- ??? URL ????: toDataURL ?? base64? ???? ??? ???? ???? ?? canvas.
function getBase64Image(img) {
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var dataURL = canvas.toDataURL("image/png");
return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
}
??: ? ???? ??? ???? ???? ??? ????? ?? ????? ?? ??? ?? crossOrigin="anonymous" ??? ????? ??? ?????. CORS. ?? ??? ???? ?? ???? ? ????.
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JavaScript?? ??? ?? ?? : ??? ??
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