Implementation of Dynamic statistical graph development by javascript _ javascript skills

This article describes how to develop a dynamic statistics graph using javascript. For more information, see the following example. Share it with you for your reference. The details are as follows:
The running effect is as follows:

The Code is as follows:
Html code:

    
Auto Sales:
    
 
 
    
  
  
Volkswagen
    
  
  
Toyota
    
  
  
Buick
    
  
  
Ford
    
  
  
Changan
    
 
 
    
    
    
    
    
    
Volkswagen        
    
Toyota        
    
Buick        
    
Ford        
    
Changan        
    

Css code:

#content {position:absolute;top:50%;left:50%;margin:-340px 0 0 -450px;width:900px;height:600px;}.legend {float:left;width:250px;margin-top:140px;}#content h1 {font-family:'Cabin Sketch', arial, serif;text-shadow:3px 3px 0 #ddd;color:#193340;font-size:40px;margin-bottom:40px;text-align:right;}.skills {float:left;clear:both;width:100%;}.skills ul,.skills li {display:block;list-style:none;margin:0;padding:0;}.skills li {float:right;clear:both;padding:0 15px;height:35px;line-height:35px;color:#fff;margin-bottom:1px;font-size:18px;}

Js Code:

var o = {      init: function () {        this.diagram();      },      random: function (l, u) {        return Math.floor((Math.random() * (u - l + 1)) + l);      },      diagram: function () {        var r = Raphael('diagram', 600, 600),          rad = 73;        r.circle(300, 300, 85).attr({ stroke: 'none', fill: '#193340' });        var title = r.text(300, 300, 'loading...').attr({          font: '20px Arial',          fill: '#fff'        }).toFront();        r.customAttributes.arc = function (value, color, rad) {          var v = 3.6 * value,            alpha = v == 360 ? 359.99 : v,            random = o.random(91, 240),            a = (random - alpha) * Math.PI / 180,            b = random * Math.PI / 180,            sx = 300 + rad * Math.cos(b),            sy = 300 - rad * Math.sin(b),            x = 300 + rad * Math.cos(a),            y = 300 - rad * Math.sin(a),            path = [['M', sx, sy], ['A', rad, rad, 0, +(alpha > 180), 1, x, y]];          return { path: path, stroke: color }        }        $('.get').find('.arc').each(function (i) {          var t = $(this),            color = t.find('.color').val(),            value = t.find('.percent').val(),            text = t.find('.text').text();          rad += 30;          var z = r.path().attr({ arc: [value, color, rad], 'stroke-width': 26 });          z.mouseover(function () {            this.animate({ 'stroke-width': 50, opacity: .75 }, 1000, 'elastic');            if (Raphael.type != 'VML') //solves IE problem    this.toFront();            title.animate({ opacity: 0 }, 500, '>', function () {              this.attr({ text: text + '\n' + value + '%' }).animate({ opacity: 1 }, 500, '<');            });          }).mouseout(function () {            this.animate({ 'stroke-width': 26, opacity: 1 }, 1000, 'elastic');          });        });      }    }    $(function () { o.init(); });

I hope this article will help you learn about javascript programming.