js 将canvas生成图片保存,或直接保存一张图片的实现方法

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();
}