A line chart is a chart that uses polylines to connect various data point marks to show the changing trend of data. (The optimal version for all the following settings to take effect is: 5.4.0 or above) The
previous configurations of graphic series such as line charts, column charts, etc. are basically the same. Here we only select the series part. If there are differences in other parts, they will be mentioned separately:
series: {
name: 'Beijing AQI',//系列名称
type: 'line',//属性指定为折线