柱状图上如何显示所占百分比echarts 45%配置项内容和展示

柱状图上如何显示所占百分比

      option = {
    color: ['#367DA2'],
    title: {
        text: '推荐配置视图',
        left: 'center',
        textStyle: {
            fontSize: 14,
            fontWeight: 'normal',
        },
    },
    legend: {
        bottom: '0%',
        data: ['配置比例']
    },
    tooltip: {
        show: true
    },
    xAxis: [{
        type: 'category',
        axisLine: {
            onZero: false
        },
        axisTick: {
            show: false
        },
        data: ["国内固定权益", "海外固定权益", "大商品", "货币", "国内权益", "海外权益", "对冲投资", "另类投资"]
    }],
    yAxis: [{
        type: 'value',
        splitNumber: 4,
        max: 80,
        min: 0,
        interval: 20,
        axisLabel: {
            formatter: function(value) {
                return value.toFixed(2) + '%';
            }
        },
        axisLine: {
            show: false
        },
        axisTick: {
            show: false
        }
    }],
    grid: {
        left: '0%',
        right: '4%',
        bottom: '10%',
        top: '15%',
        containLabel: true
    },
    series: [{
        name: "销量",
        type: "bar",
        barWidth: '45%',
        data: [5, null, null, null, 15, 68, null, null],
        label: {
            normal: {
                show: true,
                position: 'top',
                formatter: function(param) {
                    return param.value.toFixed(2) + '%';
                }
            }
        },
    }]
};