在我发布此内容之前，我检查了数十个stackoverflow，甚至尝试了不同的方法，但是我从来没有做对。
这是我的第一个试用代码。它应该做的是将svg转换为png，然后在下载时下载。它在Chrome浏览器中完美运行，但在Firefox中无法正常运行。
svgcontent和画布的宽度/高度具有有效值。 “ fname”是也具有有效值的文件名
var svgcontent = $(this).closest('.svg-divinner').find(' .svg-file')[0].contentDocument.documentElement;
var cheight = svgcontent.viewBox.baseVal.height;
var cwidth = svgcontent.viewBox.baseVal.width;
var svgText = (new XMLSerializer()).serializeToString(svgcontent);
var img = new Image();
img.onload = function (){
var canvas = document.createElement("canvas");
canvas.width = cwidth;
canvas.height = cheight;
var ctxt = canvas.getContext("2d", {preserveDrawingBuffer: true});
ctxt.fillStyle = "rgba(0,0,0,0.0)";
ctxt.fillRect(0, 0, canvas.width, canvas.height);
ctxt.drawImage(this, 0, 0);
var a = document.createElement("a");
a.href = canvas.toDataURL("image/png");
a.download = fname+".png"
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
};
img.src = "data:image/svg+xml;utf8," + encodeURIComponent(svgText);
因此，上面的代码无法正常工作。然后我尝试使用回调的另一个选项，下面的代码。 drawInlineSVG（）的作用是在进行回调后下载uri。我找不到在哪里引用drawInlineSVG，但我也在stackoverflow中找到了它。
var svgcontent = $(this).closest('.svg-divinner').find(' .svg-file')[0].contentDocument.documentElement;
var cheight = svgcontent.viewBox.baseVal.height;
var cwidth = svgcontent.viewBox.baseVal.width;
var svgText = (new XMLSerializer()).serializeToString(svgcontent);
var ctxt = canvas.getContext("2d", {preserveDrawingBuffer: true});
ctxt.fillStyle = "rgba(0,0,0,0.0)";
ctxt.fillRect(0, 0, canvas.width, canvas.height);
var img = new Image();
drawInlineSVG(ctxt, svgText, function(uri) {
var a = document.createElement("a");
a.href = canvas.toDataURL();
a.download = fname+".png";
document.body.appendChild(a); a.click(); document.body.removeChild(a);
});
function drawInlineSVG(ctx, rawSVG, callback) {
var svg = new Blob([rawSVG], {type:"image/svg+xml;charset=utf-8"}),
domURL = self.URL || self.webkitURL || self,
url = domURL.createObjectURL(svg),
img = new Image;
img.onload = function () {
ctxt.drawImage(this, 0, 0,canvas.width,canvas.height);
domURL.revokeObjectURL(url);
callback(this);
};
img.src = url;
}
两个选项均无效。它仍然返回相同的旧“ AAAA”值
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAB4AAAAQ4CAYAAADo08FDAAAfiUlEQVR4nOzBAQEAAACAkP6v7ggKAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA…
请，我不是专家，对此我真的非常感谢。
编辑：这是我拥有的SVG
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 23.0.3, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="Layer_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 2000 2000" style="enable-background:new 0 0 2000 2000;" xml:space="preserve">
<style type="text/css">
.st0{fill:#F7F7F7;}
.st1{fill:#494949;}
.st2{opacity:0.5;}
.st3{fill:#00AEF0;}
.st4{fill:#0A0A0A;}
.st5{fill:#FFFFFF;}
.st6{opacity:0.15;fill:#DDD545;}
.st7{fill:#DDD545;}
.st8{fill:#FAB9AF;}
.st9{fill:#333333;}
</style>
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--------------- UPDATE ---------------
所以我能够通过将SVG文件本身的height和width属性设置为问题来解决它，因为总体问题是（引用自Kaiido）
浏览器无法为要绘制的图像设置高度或宽度，因此无法将其渲染到画布上。 （它可以在文档中进行估算，因为它可以相对于某物，但是相对于画布而言）。
因此解决方案是在svg文件中设置绝对宽度和高度属性
谢谢！