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The plugin can display the number of remaining ticket numbers for each day of each month. Available to provide differential quick calculation model. This plug-in is completely self-developed and open source. Need to change zhuzhi.js initColmH to set the height of the chart; max sets the highest point value of the chart, setMax sets the y-axis draggable pointer value. Note that it should be less than the max value. Initialize the array X of expected number of people to pick up tickets on site; the chart will show several groups of histograms as many data as there are.