保存网页中的canvas为图片

function saveCanvasFixBlank(selector) {
  const canvas = document.querySelector(selector);
  if (!canvas) return alert('无匹配canvas');
  // 修复canvas宽高错位导致的空白问题
  const rect = canvas.getBoundingClientRect();
  canvas.width = rect.width;
  canvas.height = rect.height;
  // 重新导出
  const a = document.createElement('a');
  a.href = canvas.toDataURL('image/png',1);
  a.download = `canvas_fixed_${Date.now()}.png`;
  a.click();
}
// 使用
saveCanvasFixBlank('#你的canvas选择器');