如何在使用JavaScript保存图片的同时清除图片？

var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
context.drawImage(image, 0, 0); // image为要保存的图片对象

var imageDataURL = canvas.toDataURL('image/png'); // 可以指定图片格式，如'image/jpeg'

var newImage = new Image();
newImage.src = imageDataURL;

URL.revokeObjectURL(image.src);

function saveAndClearImage(image) {
  var canvas = document.createElement('canvas');
  var context = canvas.getContext('2d');
  context.drawImage(image, 0, 0);

  var imageDataURL = canvas.toDataURL('image/png');

  var newImage = new Image();
  newImage.src = imageDataURL;

  URL.revokeObjectURL(image.src);
}