使用highchart的步骤.

refer to:  http://www.highcharts.com/stock/demo, 

http://jsfiddle.net/gh/get/jquery/1.9.1/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/column-stacked

1. 下载两个javascript 到你的 app/assets/javascript 目录

$ wget http://code.highcharts.com/highcharts.js
$ wget http://code.highcharts.com/modules/exporting.js

然后, 在你的页面中,加上:  
<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>

2. 代码中加上下面的js即可:

    $('#chart_container').highcharts({
        chart: {
            type: 'column'
        },
        title: {
            text: '竞品统计图'
        },
        xAxis: {
            categories: ['360', '百度', '豌豆荚', 'hawei', 'oppo']
        },
        yAxis: {
            min: 0,
            title: {
                text: '排名位置'
            },
            stackLabels: {
                enabled: true,
                style: {
                    fontWeight: 'bold',
                    color: (Highcharts.theme && Highcharts.theme.textColor) || 'gray'
                }
            }
        },
        legend: {
            align: 'right',
            x: -30,
            verticalAlign: 'top',
            y: 25,
            floating: true,
            backgroundColor: (Highcharts.theme && Highcharts.theme.background2) || 'white',
            borderColor: '#CCC',
            borderWidth: 1,
            shadow: false
        },
        tooltip: {
            formatter: function () {
                return '' + this.x + '

' +
                    this.series.name + ': ' + this.y + '
'
            }
        },
        plotOptions: {
            column: {
                stacking: 'normal',
                dataLabels: {
                    enabled: true,
                    color: (Highcharts.theme && Highcharts.theme.dataLabelsColor) || 'white',
                    style: {
                        textShadow: '0 0 3px black'
                    }
                }
            }
        },
        series: [{
            name: '优酷',
            data: [5, 3, 4, 7, 2]
        }, {
            name: '土豆',
            data: [2, 2, 3, 2, 1]
        }, {
            name: '爱奇异',
            data: [3, 4, 4, 2, 5]
        }]
    });