相关疑难解决方法(0)

我创建了一个包含9个元素(圆圈)的组,例如:

// JS
var data=[ 1,2,3,4,5,6,7,8,9 ];
var svg = d3.select("body").append("svg");
var circles = svg.append("g").attr("id", "groupOfCircles")
    .selectAll("circle")
        .data(data)
    .enter().append("circle")
        .attr("cx", function(d){ return d*20;})
        .attr("cy", function(d){ return d*10;})
        .attr("r" , function(d){ return d;})
        .attr("fill","green");

//xml
<svg>
    <g id="groupOfCircles">
        <circle cx="20" cy="10" r="1" fill="green"></circle>
        <circle cx="40" cy="20" r="2" fill="green"></circle>
        <circle cx="60" cy="30" r="3" fill="green"></circle>
        <circle cx="80" cy="40" r="4" fill="green"></circle>
        <circle cx="100" cy="50" r="5" fill="green"></circle>
        <circle cx="120" cy="60" r="6" fill="green"></circle>
        <circle cx="140" cy="70" r="7" fill="green"></circle>
        <circle cx="160" cy="80" r="8" fill="green"></circle>
        <circle cx="180" cy="90" …