无法将base64Image转换为ImageData对象

var binaryData = atob(base64Image);

var length = binaryData.length;
var uint8Array = new Uint8Array(length);
for (var i = 0; i < length; i++) {
  uint8Array[i] = binaryData.charCodeAt(i);
}

var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var image = new Image();

image.onload = function() {
  canvas.width = image.width;
  canvas.height = image.height;
  context.drawImage(image, 0, 0);
  var imageData = context.getImageData(0, 0, image.width, image.height);
  // 使用imageData对象进行后续处理
};

image.src = URL.createObjectURL(new Blob([uint8Array.buffer], { type: 'image/jpeg' }));