关于javascript:Js下载图片解决跨域问题

function downloadImage(imgsrc, name) {    const image = new Image();    // 解决跨域 Canvas 净化问题    image.setAttribute('crossOrigin', 'anonymous');    image.onload = function () {        const canvas = document.createElement('canvas');        canvas.width = image.width;        canvas.height = image.height;        const context = canvas.getContext('2d');        context.drawImage(image, 0, 0, image.width, image.height);        const url = canvas.toDataURL('image/png');        const a = document.createElement('a');        const event = new MouseEvent('click');        a.download = name || 'photo';        a.href = url;        a.dispatchEvent(event);    };    image.src = imgsrc;}