标签：
子选择器，在特定范围内选择元素
<section id="section1">
<div><h3>div1</h3></div>
</section>
<section id="section2">
<div><h3>div2</h3></div>
</section>
<script type="text/javascript">
d3.select("#section1 > div")
.style("border","2px solid blue");
d3.select("#section2")
.select("div")
.style("border","2px solid red");
</script>
后代连接符 div span
子连接符 div > span 必须是严格的父子关系
函数级联调用（仅使用d3生成页面）
<script type="text/javascript">
var body = d3.select("body");
body.append("section")
.attr("id","section1")
.append("div")
.style("border","2px solid blue")
.append("p")
.text("be my valentine");
body.append("section")
.attr("id","section2")
.append("div")
.style("border","2px solid red")
.append("p")
.text("be my darling");
</script>
标签：
原文地址：http://www.cnblogs.com/valentineisme/p/4217873.html
