代码

Params //此处添加参数 Numeric length(30);Vars //此处添加变量 Numeric avg; Global Integer timerId; Series<Numeric> bar_in_day; Series<Numeric> highest_in_day; Series<Numeric> lowest_in_day; Series<Numeric> trade_count; Bool isFirstDay(false); // 标记是否为数据集的第一天Defs Events //此处实现事件函数 OnInit() { isFirstDay = true; } //Bar更新事件函数，参数indexs表示变化的数据源图层ID数组 OnBar(ArrayRef<Integer> indexs) { if(TrueDate(0)<>TrueDate(1) || isFirstDay) { bar_in_day = 0; highest_in_day = high; lowest_in_day = low; } bar_in_day = bar_in_day + 1; Commentary(\"当天第几根bar：\"+text(bar_in_day)); If(bar_in_day <= length) { highest_in_day = max(highest_in_day,high); lowest_in_day = min(lowest_in_day,low); } //PlotNumeric(\"low:\",low); PlotNumeric(\"highest_in_day:\",highest_in_day); PlotNumeric(\"lowest_in_day:\",lowest_in_day); }这段代码是在k线中显示当天最低和最高价，但是第一天的最低价总是为0，是什么原因？