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();}