1.全局綁定滾輪事件，獲得dataZoom最新的位置：
myChart.on('dataZoom',function(event){
if(event.batch){
start=event.batch[0].start;
end=event.batch[0].end;
}else{
start=event.start;
end=event.end;
};
});
2.把最新的start和end賦值給要更新的option
window.setInterval(function () {
num=Math.random()*num+100;
data0.splice(0,1);
data0.push(num);
option.dataZoom[0].start=start;
option.dataZoom[0].end=end;
myChart.setOption(option);
},3000);
3.echart數據增量刷新還可以用appendData
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