Peek.js 介绍
Peek.js 是一个用于 Web 应用的图表生成库，基于 D3.js 开发。特性：
-
面向对象可重用的图表
-
JSON 数据格式
-
易于理解和定制
示例代码：
/*
Charts are instantiated as objects. There are two different ways to pass
data and draw the chart:
i) by passing a data array to render() directly
var trend_chart = new Trend("#trend-chart");
trend_chart.render(trend_data);
ii) by setting the url to the data and calling draw()
var trend_chart = new Trend("#trend-chart");
trend_chart.url = 'trend.json';
chart.draw();
*/
var trend_chart = new Trend("#trend-chart");
//trend_chart.interpolate = "monotone"; //default=cardinal
trend_chart.showTooltip = true;
trend_chart.render(trend_data);
var stacked_chart = new Stacked("#stacked-bar-chart");
stacked_chart.render(stacked_data);
var compare_chart = new Compare('#compare-chart');
compare_chart.render(horizontal_bar_data);
var pie_one = new Pie("#pie-one");
var pie_two = new Pie("#pie-two");
pie_one.render(pie_data_one);
pie_two.render(pie_data_two);
pie_one.legend("#pie-legend", pie_data_one);