echarts 每个柱子都显示不同的颜色

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color: function (params) {                         var colorList = [                             ['rgb(14,102,179)', 'rgb(51,36,169)'],                             ['#F5cF0D', '#fa9203'],                             ['#61dbe8', '#0785de'],                             ['#ff9717', '#ff4518'],                         ];                         var index = params.dataIndex;                         if (params.dataIndex >= colorList.length) {                             index = params.dataIndex - colorList.length;                         }                         return new echarts.graphic.LinearGradient(0, 0, 0, 1,                             [{                                     offset: 0,                                     color: colorList[index][0]                                 },                                 {                                     offset: 1,                                     color: colorList[index][1]                                 }                             ]);                     }