the number of points sent back by the two pieces of data in echarts is inconsistent, resulting in two lines, one long and the other short. For example, the first piece of data sends back 340 points, and the second item sends back 23 points
. 
how can the length of the line be determined according to time? It can be used if there is no data at the same time-how can the display be realized?
property change-connectNulls: true
add the missing data to null
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