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itemStyle.normal.label is deprecated, use label instead.
'normal’hierarchy in label has been removed since 4.0. All style properties are configured in label directly now.
错误写法：

itemStyle: {normal: {// color: '#00E0FF',  // 设置折线点颜色 label: {  //在折线拐点上显示数据},}},

正确写法：label移动到最外层和itemStyle同级

     label: {  //在折线拐点上显示数据},itemStyle: { },