ignore tooltip in node, but can work in vml.
ignore tooltip in node, but can work in vml.

hexj/echarts,xiayz/echarts,chenfwind/echarts,xiayz/echarts,chenfwind/echarts,apache/incubator-echarts,starlkj/echarts,hexj/echarts,100star/echarts,starlkj/echarts,ecomfe/echarts,ecomfe/echarts,100star/echarts,apache/incubator-echarts,hexj/echarts,starlkj/echarts