fix img cors error All In One

fix img cors error All In One

function imageReceived() {
  let canvas = document.createElement("canvas");
  let context = canvas.getContext("2d");

  canvas.width = downloadedImg.width;
  canvas.height = downloadedImg.height;

  context.drawImage(downloadedImg, 0, 0);
  imageBox.appendChild(canvas);

  try {
    localStorage.setItem("saved-image-example", canvas.toDataURL("image/png"));
  }
  catch(err) {
    console.log("Error: " + err);
  }
}

crossorigin="anonymous"

<img src="https://img2020.cnblogs.com/blog/740516/202201/740516-20220103215619757-6980613.png" crossorigin="anonymous">

<img src="https://cdn.xgqfrms.xyz/css-effects-all-in-one/images/before.png" crossorigin="anonymous">

solution

function loadImgAsBase64(url, callback) {
  let canvas = document.createElement('CANVAS');
  let img = document.createElement('img');
  //img.setAttribute('crossorigin', 'anonymous');
  img.src = url;

  img.onload = () => {
    canvas.height = img.height;
    canvas.width = img.width;
    let context = canvas.getContext('2d');
    context.drawImage(img, 0, 0);
    let dataURL = canvas.toDataURL('image/png');
    canvas = null;
    callback(dataURL);
  };
}


let url = 'http://lorempixel.com/500/150/sports/9/';

this.loadImgAsBase64(url, (dataURL) => {
   msg.innerText = dataURL.slice(0,50)+'...';
});

demo

https://www.cnblogs.com/xgqfrms/p/13337924.html

https://codepen.io/xgqfrms/pen/wvMQqZL

refs

https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image

https://stackoverflow.com/questions/43000648/html-img-src-works-but-js-image-loading-cause-cors-error

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