js下载网站中的canvas保存为图片

用处挺大的，毕竟很多生成网站都是生成canvas，懂得都懂

代码语言：javascript

复制

function exportCanvasAsPNG(id, fileName) {
var canvasElement = document.getElementById(id);

var MIME_TYPE = &#34;image/png&#34;;

var imgURL = canvasElement.toDataURL(MIME_TYPE);

var dlLink = document.createElement(&#39;a&#39;);
dlLink.download = fileName;
dlLink.href = imgURL;
dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(&#39;:&#39;);

document.body.appendChild(dlLink);
dlLink.click();
document.body.removeChild(dlLink);

}

直接通过jspath获取element

代码语言：javascript

复制

var canvasElement = document.querySelector("#root > div > div > div > div > div.NewPatternView_preview__2qc3i > div > canvas");

var MIME_TYPE = "image/png";

var imgURL = canvasElement.toDataURL(MIME_TYPE);

var dlLink = document.createElement('a');

dlLink.download = 'a.png';

dlLink.href = imgURL;

dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(':');
document.body.appendChild(dlLink);

dlLink.click();

document.body.removeChild(dlLink);