解决echarts报警告
警告内容：
export 'default' (imported as 'echarts') was not found in 'echarts' (possible exports: Axis, ChartView, ComponentModel, ComponentView, List, Model, PRIORITY, Ser iesModel, color, connect, dataTool, dependencies, disConnect, disconnect, dispose, env, exten.........
解决方法
"echarts": "^5.4.3",替换为
"echarts": "^4.9.0",