图例设置了却不显示

var option = {
    title: {
        text: \'医疗全成本收益\',
        subtext: \'\',
        x: \'left\'
    },
    tooltip: {
        trigger: \'axis\',
        axisPointer: {            // 坐标轴指示器，坐标轴触发有效
            type: \'shadow\'        // 默认为直线，可选为：\'line\' | \'shadow\'
        }
    },
    legend: {
        data: [\'医疗收入\', \'医疗全成本\', \'医疗全成本收益\'],
        y: \'bottom\',
        x: \'center\'
    },
    toolbox: {
        show: true,
        feature: {
            mark: {show: true},
            dataView: {show: true, readOnly: false},
            magicType: {show: true, type: [\'line\', \'bar\', \'stack\', \'tiled\']},
            restore: {show: true},
            saveAsImage: {show: true}
        }
    },
    calculable: true,
    xAxis: [
        {
            type: \'category\',
            data: []
            //data:[]
        }
    ],
    yAxis: [
        {
            type: \'value\',
            axisLabel: {
                formatter: function (value) {
                    return value / (10000 * 10000 ) + "亿";
                }
            }
        },
        {
            type: \'value\',
            axisLabel: {
                formatter: function (value) {
                    return value / (10000 * 10000 ) + "亿";
                }
            }
        }
    ],
    series: [
        {
            name: \'医疗收入\',
            type: \'line\',
            stack: \'总量\',
            barWidth: 20,
            itemStyle: {normal: {label: {show: true, position: \'insideRight\'}}},
            data: []
            //data:[]
        },
        {
            name: \'医疗全成本\',//这个是对应的图例，动态添加输出的话必须与这个名字对应，如果不一致该图例隐藏，但chart效果不隐藏
            type: \'line\',
            stack: \'总量\',
            barWidth: 20,
            itemStyle: {normal: {label: {show: true, position: \'insideRight\'}}},
            data: []
            //data:[]
        },
        {
            name: \'医疗全成本收益\',
            type: \'line\',
            stack: \'总量\', yAxisIndex: 1,
            itemStyle: {normal: {label: {show: true, position: \'insideRight\'}}},
            data: []
            //data:[]
        }

    ]
};