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下面开始用D3.js处理第一个简单问题，先看下面的代码：
<html>
<head>
<meta charset="utf-8">
<title>HelloWorld</title>
</head>
<body>
<p>Hello World 1</p>
<p>Hello World 2</p>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>HelloWorld</title>
</head>
<body>
<p>Hello World 1</p>
<p>Hello World 2</p>
<script>
var paragraphs = document.getElementsByTagName("p");
for (var i = 0; i < paragraphs.length; i++) {
var paragraph = paragraphs.item(i);
paragraph.innerHTML = "I like dog.";
}
</script>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>HelloWorld</title>
</head>
<body>
<p>Hello World 1</p>
<p>Hello World 2</p>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>
d3.select("body").selectAll("p").text("www.ourd3js.com");
</script>
</body>
</html>
接下来改变字体的颜色和大小，如下：
var p = d3.select("body").selectAll("p").text("www.ourd3js.com");
p.style("color","red");
p.style("font-size","72px");
可以看到上面的代码先给变量p赋值，再使用p。这样可以使代码更整洁。[1] D3.js的HelloWorld,布布扣,bubuko.com
原文：http://blog.csdn.net/lzhlzz/article/details/27197993