parentNode in d3 svg

Question

I've used an example snippet , cited here , to get to the parent node of a svg element, but I obtain undefined . Why? And How to correct it?

var svg = d3.select('svg');

var lbl=    svg.append("text")
        .attr("x", 10)
        .attr("y", 110)
        .text("aaaaa");

alert(lbl.parentNode);  

(JSFiddle version here )

Answer 1

lbl仍然是d3选择，要执行.parentNode，您需要首先获取lbl的DOM节点

alert(lbl.node().parentNode);