自助仪表盘的地图如何实现循环高亮效果

function main(page: IPage, portlet: IEChartsPortlet) {
    // console.log('portlet: ', portlet)
    // console.log('chartInstance: ', portlet.getChartInstance())
    let options = portlet.getChartOptions() //获取组件对象
    let data = options.series[0].data
    let count = data.length
    let chartInstance = portlet.getChartInstance()
    let curIndex = 0
    let lastIndex = -1
    let interval = setInterval(function () { // 定时器，但是没关
        try {
            // console.log('curIndex: ', curIndex)
            // console.log('lastIndex: ', lastIndex)
            if (lastIndex != -1) {
                chartInstance.dispatchAction({
                    type: 'downplay',
                    dataIndex: lastIndex
                });
            }
            chartInstance.dispatchAction({
                type: 'highlight',
                dataIndex: curIndex
            });
            lastIndex = curIndex
            curIndex++
            if (curIndex >= count) {
                curIndex = 0
            }

        } catch (e) {
            console.error('e： ', e)
            clearInterval(interval)
        }
    }, 1500)

    
}