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<title>Document</title>
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<img id="img" src="" width="200" height="200" />
<script>
var img = "https://img.yzcdn.cn/vant/cat.jpeg";
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, img.width, img.height);
var ext = img.src.substring(img.src.lastIndexOf(".") + 1).toLowerCase();
var dataURL = canvas.toDataURL("image/" + ext);
return dataURL;
}
var image = new Image();
image.crossOrigin = '';
image.src = img;
image.onload = function () {
var base64 = getBase64Image(image);
console.log(base64);
document.getElementById('img').src = base64
}
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