將程式碼更改為如下程式碼：

option = {
    title: {
        x: 'center',
        text: 'Age',
        subtext: 'Rainbow bar for Age',
        link: 'http://echarts.baidu.com/doc/example.html'
    },
    tooltip: {
        trigger: 'item',
        formatter: '{b}:\n{c}%'
    },
    toolbox: {
        show: true,
        feature: {
            dataView: {show: true, readOnly: false},
            restore: {show: true},
            saveAsImage: {show: true}
        }
    },
    calculable: true,
    grid: {
        borderWidth: 0,
        y: 80,
        y2: 60
    },
    xAxis: [
        {
            type: 'category',
            show: true,
            data: ['4-14', '15-24', '25-34', '35-44', '45-54', '55-64', '65以上']
        }
    ],
    yAxis: [
        {
            type: 'value',
          	axisLabel: {
                  show: true,
                  interval: 'auto',
                  formatter: '{value} %'
                },
            show: true
        }
    ],
    series: [
        {
            name: 'Age',
            type: 'bar',
            itemStyle: {
                normal: {
                    color: function(params) {
                        // build a color map as your need.
                        var colorList = [
                          '#C1232B','#B5C334','#FCCE10','#E87C25','#27727B',
                           '#FE8463','#9BCA63','#FAD860','#F3A43B','#60C0DD',
                           '#D7504B','#C6E579','#F4E001','#F0805A','#26C0C0'
                        ];
                        return colorList[params.dataIndex]
                    },
                    label: {
                        show: true,
                        position: 'top',
                        formatter: '{b}\n{c}%'
                    }
                }
            },
            data: [12,21,10,4,12,5,6,5,25,23,7],
            markPoint: {
                tooltip: {
                    trigger: 'item',
                    backgroundColor: 'rgba(0,0,0,0)',
                    formatter: function(params){
                        return '<img src="' 
                                + params.data.symbol.replace('image://', '')
                                + '"/>';
                    }
                },
                data: [
                    {xAxis:0, y: 350, name:'4-14', symbolSize:20, symbol: 'image://../asset/ico/折線圖.png'},
                    {xAxis:1, y: 350, name:'15-24', symbolSize:20, symbol: 'image://../asset/ico/柱狀圖.png'},
                    {xAxis:2, y: 350, name:'25-34', symbolSize:20, symbol: 'image://../asset/ico/散點圖.png'},
                    {xAxis:3, y: 350, name:'35-44', symbolSize:20, symbol: 'image://../asset/ico/K線圖.png'},
                    {xAxis:4, y: 350, name:'45-54', symbolSize:20, symbol: 'image://../asset/ico/餅狀圖.png'},
                    {xAxis:5, y: 350, name:'55-64', symbolSize:20, symbol: 'image://../asset/ico/雷達圖.png'},
                    {xAxis:6, y: 350, name:'65以上', symbolSize:20, symbol: 'image://../asset/ico/和絃圖.png'},
                    //{xAxis:7, y: 350, name:'Force', symbolSize:20, symbol: 'image://../asset/ico/力導向圖.png'},
                    //{xAxis:8, y: 350, name:'Map', symbolSize:20, symbol: 'image://../asset/ico/地圖.png'},
                    //{xAxis:9, y: 350, name:'Gauge', symbolSize:20, symbol: 'image://../asset/ico/儀表盤.png'},
                    //{xAxis:10, y: 350, name:'Funnel', symbolSize:20, symbol: 'image://../asset/ico/漏斗圖.png'},
                ]
            }
        }
    ]
};