svg top png

svg转png

```
const svg=`<svg version="1.1" baseProfile="full" width="300" height="200"
xmlns="http://www.w3.org/2000/svg">
   <rect width="100%" height="100%" fill="red" />
   <circle cx="150" cy="100" r="80" fill="green" />
   <text x="150" y="125" font-size="60" text-anchor="middle" fill="white">SVG</text></svg>`
svgToPng(svg,(imgData)=>{
    const pngImage = document.createElement('img');
    document.body.appendChild(pngImage);
    pngImage.src=imgData;
});
 function svgToPng(svg, callback) {
    const url = getSvgUrl(svg);
    svgUrlToPng(url, (imgData) => {
        callback(imgData);
        URL.revokeObjectURL(url);
    });
}
function getSvgUrl(svg) {
    return  URL.createObjectURL(new Blob([svg], { type: 'image/svg+xml' }));
}
function svgUrlToPng(svgUrl, callback) {
    const svgImage = document.createElement('img');
    // imgPreview.style.position = 'absolute';
    // imgPreview.style.top = '-9999px';
    document.body.appendChild(svgImage);
    svgImage.onload = function () {
        const canvas = document.createElement('canvas');
        canvas.width = svgImage.clientWidth;
        canvas.height = svgImage.clientHeight;
        const canvasCtx = canvas.getContext('2d');
        canvasCtx.drawImage(svgImage, 0, 0);
        const imgData = canvas.toDataURL('image/png');
        callback(imgData);
        // document.body.removeChild(imgPreview);
    };
    svgImage.src = svgUrl;
 }
 ```
 
 
 - [Convert SVG to image (JPEG, PNG, etc.) in the browser](https://stackoverflow.com/questions/3975499/convert-svg-to-image-jpeg-png-etc-in-the-browser)