Updating JS to work with IE10

Question

I've been given the task of updating some Javascript for IE10. I've searched endlessly for a solution, but I just can't seem to find one. The piece of code I'm stuck at is:

var svgns = "http://www.w3.org/2000/svg";
this.svgDoc = document.getElementById("SVGDoc").getSVGDocument();
this.grp = this.svgDoc.createElementNS(svgns, "g");
this.grp.setAttribute("id", this.id);

if (this.parent)
    this.svgDoc.getElementById(this.parent.id).appendChild(this.grp);
else
    this.svgDoc.getDocumentElement.appendChild(this.grp);

The last line is where it fails, giving me the error Unable to get property appendChild of undefined or null reference . I can't seem to figure out why it is a null reference as it worked with IE8 and lower.

Answer 1

getDocumentElement应该只是documentElement根据工程上几乎所有IE版本， 这