echarts中markArea设置文字并使文字不被遮挡浮于曲线之上

1. 当设置markArea 如下:
   markArea: {
   data: [
   [
   {
   name: ‘成功\n\n\n\n\n炉’,
   label: {
   show: true,
   offset: [0, 150],
   color: ‘#ff0000’,
   fontSize: 16,
   zIndex: 10,
   },
   itemStyle: {
   color: ‘rgba(233,205,203,.4)’
   },
   x: ‘45%’,
   },
   {
   x: ‘60%’,
   },
   ],
   ],
   },
   显示的效果如图: 文字被折线图遮挡
   3. 在textArea中无论怎么设置层级都不生效, 需要在当前曲线的层级下设置( z: 0),代码及实现效果如下:
   {
   name: ‘memory’,
   type: ‘line’,
   // symbol: ‘circle’,
   symbol: ‘none’,
   xAxisIndex: 1,
   yAxisIndex: 1,
   z: 0,
   itemStyle: {
   normal: {
   color: ‘#75b228’,
   },
   },
   markArea: {
   data: [
   [
   {
   name: ‘成功\n\n\n\n\n炉’,
   label: {
   show: true,
   offset: [0, 150],
   color: ‘#ff0000’, // markArea中文字（name）颜色
   fontSize: 16,
   zIndex: 10,
   },
   itemStyle: {
   color: ‘rgba(233,205,203,.4)’,
   },
   x: ‘45%’,
   },
   {
   x: ‘60%’,
   },
   ],
   ],
   },
   data: data.memory,
   },
   效果: