Highcharts 调整曲线图的粗细、点大小、点形状

例子1： 粗细：lineWidth 默认值为2   plotOptions: { series: { marker: { radius: 3, //曲线点半径，默认是4 symbol: ‘diamond’ //曲线点类型：”circle”, “square”, “diamond”, “triangle”,”triangle-d

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