export function setDispatchTip(chart, offsetLength, timer, timeout){
    if(!chart) return;
    if(timer){
        clearInterval(timer)
        timer = null
    }
    let len = 0
    let _timer = setInterval(()=>{
        if(len === offsetLength){
            len = 0
        }
        chart.dispatchAction({
            type: 'showTip',
            seriesIndex: 0,
            dataIndex: len,
        })
        len ++
    },  timeout || 2000)
    return _timer
}