JS实现Canvas生成图片保存及直接下载图片的方法

function downLoadImage(canvas,name) {
  var a = document.createElement("a");
  a.href = canvas.toDataURL();
  a.download = name;
  a.click();
}

function downLoadImage(img,name) {
  var a = document.createElement("a");
  a.href = img.src;
  a.download = name;
  a.click();
}