美国储蓄、投资和经常账户赤字echarts 折线配置项内容和展示

为什么markarea不起作用？这个图的代码和http://gallery.echartsjs.com/editor.html?c=xBk572gs3M&v=3这个图的代码一毛一样，但是一个能显示，一个不能显示

      option = {
    title: [{
            text: '美国储蓄、投资和经常账户赤字',
            left: 'center'
        },
        {
            subtext: '这个图反映的是储蓄缺口（两根折线\n之间的阴影部分）和净出口的关系\n',
            subtextStyle: {
                fontStyle: 'bold'
            },
            left: 80,
            top: 100
        },
    ],
    tooltip: {
        //？触发类型
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        }
    },
    legend: {
        orient: 'vertical',
        left: 'left',
        data: ['投资', '储蓄', '经常账户赤字']
    },
    grid: {
        left: '3%',
        right: '4%',
        top: '20%',
        bottom: '3%',
        containLabel: true
    },
    //工具栏组件
    toolbox: {
        show: true,
        feature: {
            saveAsImage: {} //是否保存图片  
        }
    },
    xAxis: {
        type: 'category', //X轴均为category，Y轴均为value   //设置为类目轴  
        // boundaryGap: false,  //数值轴两端的空白策略  //类目在分割线上  
        data: [1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016]
    },
    yAxis: {
        type: 'value',
        name: "千亿美元",
        axisLabel: {
            formatter: '{value}'
        },
        axisPointer: {
            snap: true
        }
    },
    series: [{
            name: "投资",
            type: 'line',
            // stack:'总量',
            label: {
                normal: {
                    show: true,
                    position: 'top'
                }
            },
            lineStyle: {
                normal: {
                    type: 'dashed'
                }
            },
            data: [12.84, 12.38, 13.09, 13.99, 15.51, 16.25, 17.52, 19.25, 20.77, 22.53, 24.24, 23.42, 23.69, 24.93, 27.65, 30.41, 32.33, 32.36, 30.59, 25.25, 27.53, 28.78, 31.26, 32.99, 35.11, 37.02, 36.67]
        },
        {
            name: '储蓄',
            type: 'line',
            stack: '总量',
            smooth: true,
            label: {
                normal: {
                    show: true,
                    position: 'bottom'
                }
            },
            data: [12.06, 12.1, 12.74, 13.34, 14.58, 15.35, 16.56, 18.23, 19.14, 19.96, 20.48, 19.74, 19.42, 19.9, 21.46, 23.2, 24.62, 25.17, 23.36, 21.3, 22.4, 22.98, 25.6, 28.07, 30.36, 31.78, 31.46],
            markArea: {
                data: [
                    [{
                        name: '金融危机',
                        xAxis: '2006'
                    }, {
                        xAxis: '2009'
                    }]
                ],
                label: {
                    normal: {
                        show: true,
                        fontSize: 15,
                        fontWeight: 'bold',
                        color: '#2f4554'

                    }
                },
                itemStyle: {
                    normal: {
                        color: '#61a0a8',
                        opacity: 0.2
                    }
                }
            }
        },
        {
            name: '储蓄缺口',
            type: 'line',
            smooth: true,
            stack: '总量',
            areaStyle: {
                normal: {
                    color: 'green',
                    opacity: 0.1
                }
            },
            lineStyle: {
                normal: {
                    type: 'dashed',
                    color: 'rgba(0,0,0,0)'
                }
            },
            data: [0.78, 0.28, 0.35, 0.65, 0.93, 0.9, 0.96, 1.02, 1.63, 2.57, 3.76, 3.68, 4.27, 5.03, 6.19, 7.21, 7.71, 7.19, 7.23, 3.95, 5.13, 5.8, 5.66, 4.92, 4.75, 5.24, 5.21],
        },
        {
            name: '经常账户赤字',
            type: 'bar',
            label: {
                normal: {
                    show: true,
                    position: 'top'
                }
            },
            itemStyle: {
                normal: {
                    color: 'green',
                    opacity: 0.6
                }
            },
            data: [0.79, 0.03, 0.52, 0.85, 1.22, 1.14, 1.25, 1.41, 2.15, 2.88, 4.03, 3.9, 4.51, 5.19, 6.32, 7.45, 8.06, 7.11, 6.81, 3.73, 4.31, 4.45, 4.26, 3.5, 3.74, 4.35, 4.52]
        }
    ]
};