我想在我的HTML页面中下载SVG元素作为PNG。我试过这个，但下载了一个空白的PNG图像。如何下载我的HTML SVG作为PNG？ 我使用这个https://bl.ocks.org/biovisualize/8187844将SVG转换为PNG，但它无法正常工作。如何在我的HTML页面中下载SVG作为PNG图像？ 我目前的代码是：
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答案 0 :(得分：1)
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fill: #000000; opacity: 0; pointer-events: all;">Click to enter Y axis title</text><svg class="legend" x="84" y="80" width="117" height="109"><rect class="bg" style="stroke: #ffffff; stroke-opacity: 1; fill: #ffffff; opacity: 1; stroke-width: 1px;" x="0.5" y="0.5" width="116" height="108"></rect><g class="traces" transform="translate(1,14.171875)"><g class="legendsymbols" style="opacity: 1;"><g class="legendpoints"></g><path class="js-fill" data-curve="0" d="M5,0h30v6h-30z" style="stroke-width: 0px; fill: #df3f1a; fill-opacity: 1;"></path><path class="js-line" d="M5,0h30" style="stroke-width: 2px; stroke: #df3f1a; stroke-opacity: 0.7; fill: none;"></path></g><text class="legendtext text-0" x="40" y="4.65625" data-unformatted="Ruby Rouge" xml:space="preserve" style="text-anchor: start; font-size: 12px; fill: #000000; opacity: 1; pointer-events: all;">Ruby Rouge</text></g><g class="traces" transform="translate(1,33.515625)"><g class="legendsymbols" style="opacity: 1;"><g class="legendpoints"></g><path class="js-fill" data-curve="1" d="M5,0h30v6h-30z" style="stroke-width: 0px; 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fill: #337fb9; fill-opacity: 1;"></path><path class="js-line" d="M5,0h30" style="stroke-width: 2px; stroke: #337fb9; stroke-opacity: 0.7; fill: none;"></path></g><text class="legendtext text-3" x="40" y="4.65625" data-unformatted="Blue Lemon" xml:space="preserve" style="text-anchor: start; font-size: 12px; fill: #000000; opacity: 1; pointer-events: all;">Blue Lemon</text></g><g class="traces" transform="translate(1,91.546875)"><g class="legendsymbols" style="opacity: 1;"><g class="legendpoints"></g><path class="js-fill" data-curve="4" d="M5,0h30v6h-30z" style="stroke-width: 0px; fill: #a4477d; fill-opacity: 1;"></path><path class="js-line" d="M5,0h30" style="stroke-width: 2px; stroke: #a4477d; stroke-opacity: 0.7; fill: none;"></path></g><text class="legendtext text-4" x="40" y="4.65625" data-unformatted="Persia" xml:space="preserve" style="text-anchor: start; font-size: 12px; fill: #000000; opacity: 1; pointer-events: all;">Persia</text></g></svg></g><g class="hoverlayer"></g></svg>
</div>
<button onclick="download()">Download</button>
</body>
</html>
答案 1 :(得分：0)
使用<img> onload事件等待img加载完成后再使用canvas
var svgString = new XMLSerializer()
.serializeToString(document.querySelector('svg'));
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var DOMURL = self.URL || self.webkitURL || self;
var img = new Image();
var svg = new Blob([svgString], {
type: "image/svg+xml;charset=utf-8"
});
var url = DOMURL.createObjectURL(svg);
img.onload = function() {
ctx.drawImage(img, 0, 0);
var imgURL = canvas.toDataURL("image/png");
DOMURL.revokeObjectURL(imgURL);
var dlLink = document.createElement('a');
dlLink.download = "image";
dlLink.href = imgURL;
dlLink.dataset.downloadurl = ["image/png", dlLink.download, dlLink.href]
.join(':');
document.body.appendChild(dlLink);
dlLink.click();
document.body.removeChild(dlLink);
}
img.src = url;