<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>D3JS 获取元素以及添加属性</title>
</head>
<body>
<p>Hello World 1</p>
<p>Hello World 2</p>
<script src="https://cdn.bootcss.com/d3/4.13.0/d3.min.js" charset="utf-8"></script>
<script type="text/javascript"> d3.select("body").selectAll("p").text("mfg").style("color","red"); </script>
</body>
</html>
说明：
var p1 = body.select("p");
p1.style("color","red");
是选择第一个p