我已经从svg创建了一张世界地图。现在我希望用户能够选择一个我能够做的国家。但是当用户选择国家/地区时，我想在国家/地区显示一个圈子，其中包含一些消息。我无法做到这一点。请检查js小提琴链接
我面临的问题是我们使用<g>和<path>元素创建了世界地图。因此，如果我想在现有文档的顶部创建一个svgDocument，那么我必须在path元素的顶部创建一个圆圈，如果我错了，请纠正我。
当我尝试下面的代码时，我得到层次结构请求dom exception 3 。请指导我。
圈子创建代码段
var svgDocument = document.getElementById(areaId);
console.log(" svgDocument " + svgDocument);
var svgNS = svgDocument.namespaceURI;
var shape = document.createElementNS(svgNS, "circle");
shape.setAttributeNS(null, "cx", 100);
shape.setAttributeNS(null, "cy", 100);
shape.setAttributeNS(null, "r", 50);
shape.setAttributeNS(null, "fill", "green");
svgDocument.appendChild(shape)
以下是svg的一部分，其中包含美国的坐标：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 2506.2067 1446.0625"
version="1.0"
height="400"
width="800"
id="worldMap"
>
<metadata
id="metadata24111">
<rdf:RDF>
</rdf:RDF>
</metadata>
<defs
id="defs1930" />
<style>
.circle
{
opacity:0;
fill:#b9b9b9;
fill-opacity:1;
stroke:black;
stroke-width:0.5;
stroke-miterlimit:3.97446823;
stroke-dasharray:none;
stroke-opacity:1;
}
/*
* Land
*/
.land
{
fill: #b9b9b9;
fill-opacity: 1;
stroke:white;
stroke-opacity: 1;
stroke-width:0.5;
stroke-miterlimit: 3.97446823;
stroke-dasharray: none;
}
.coast
{
stroke-width: 0.3;
}
.aq
{
fill:#e6e6e6;
}
.lake
{
fill:white;
fill-opacity:1;
stroke:white;
stroke-opacity: 1;
stroke-width:0.3;
stroke-miterlimit: 3.97446823;
stroke-dasharray: none;
}
</style>
<g
class="land coast us"
id="us"
style="fill:#b9b9b9;fill-opacity:1;stroke:#ffffff;stroke-width:0.30000001;stroke-miterlimit:3.97446823;stroke-opacity:1;stroke-dasharray:none"
transform="translate(-94.32927,-61.75)" onmouseover="highlight(evt, this)" onmouseout="dehighlight(evt, this)" onclick="select(evt, this)">
<path
class="land us"
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id="path3804"
style="fill:#b9b9b9;fill-opacity:1;stroke:#ffffff;stroke-width:0.5;stroke-miterlimit:3.97446823;stroke-opacity:1;stroke-dasharray:none" />
</g></svg>
答案 0 :(得分：0)
您可能希望将圆圈不是附加到文档本身，而是附加到文档元素（或更具体的地方，例如您通过id获取的某个元素）。
替换：
svgDocument.appendChild(shape)
使用：
svgDocument.documentElement.appendChild(shape)