【D3.V3.js系列教程】--（六）数据的威力
一、使用随机数值填充每一条
1、建立新的空的数据集数组
var dataset = []; //Initialize empty array2、循环25次产生新的值for (var i = 0; i < 25; i++) { //Loop 25 times3、产生0-30的随机数 var newNumber = Math.random() * 30; //New random number (0-30)4、将数据加入数据集数组 dataset.push(newNumber); //Add new number to array}5、还可以产生整数
var newNumber = Math.round(Math.random() * 30);二、源码<!DOCTYPE html><html> <head><meta charset="utf-8"><title>testD3-5-dataPower.html</title><script type="text/javascript" src="http://localhost:8080/spring/js/d3.v3.js"></script><style type="text/css">div.bar {display: inline-block;width: 20px;height: 75px;/* Gets overriden by D3-assigned height below */margin-right: 2px;background-color: teal;}</style></head><body><script type="text/javascript">var dataset = []; //Initialize empty arrayfor (var i = 0; i < 25; i++) { //Loop 25 timesvar newNumber = Math.round(Math.random() * 30); //New random integer (0-30)dataset = dataset.concat(newNumber); //Add new number to array}d3.select("body").selectAll("div").data(dataset).enter().append("div").attr("class", "bar").style("height", function(d) {var barHeight = d * 5;return barHeight + "px";});</script></body></html>
三、效果
