tooltip的axisPointer时高亮点错误echarts -配置项内容和展示

鼠标浮动在第4天，此时第2天和第3天上也有点高亮。

      option = {
  "tooltip": {
    "backgroundColor": "rgba(255,255,255,0.9)",
    "borderWidth": 1,
    "borderColor": "#3398DB",
    "textStyle": {
      "color": "#2e384a",
      "fontSize": 12,
      "fontFamily": "\"Lucida Grande\", \"Lucida Sans Unicode\", Arial, Helvetica, sans-serif",
      "fontWeight": 300
    },
    "show": true,
    "trigger": "axis",
    "axisPointer": {
      "lineStyle": {
        "width": 1
      }
    }
  },
  "grid": {
    "show": false,
    "top": 25,
    "right": 4,
    "left": 4,
    "containLabel": true
  },
  "xAxis": {
    "type": "category",
    "splitLine": {
      "show": false
    },
    "axisLine": {
      "lineStyle": {
        "color": "#ccc"
      }
    },
    "axisTick": {
      "show": false,
      "lineStyle": {
        "color": "#ccc"
      }
    },
    "axisLabel": {
      "textStyle": {
        "color": "#7F7F7F",
        "fontSize": 12,
        "fontFamily": "\"Lucida Grande\", \"Lucida Sans Unicode\", Arial, Helvetica, sans-serif",
        "fontWeight": 300
      }
    },
    "data": [
      "1天之内",
      "第2天",
      "第3天",
      "第4天",
      "第5天"
    ]
  },
  "yAxis": {
    "type": "value",
    "splitLine": {
      "show": true
    },
    "axisLine": {
      "show": false
    },
    "axisTick": {
      "show": false
    },
    "axisLabel": {
      "textStyle": {
        "color": "#7F7F7F",
        "fontFamily": "\"Lucida Grande\", \"Lucida Sans Unicode\", Arial, Helvetica, sans-serif",
        "fontSize": 12,
        "fontWeight": "300"
      }
    }
  },
  "legend": {
    "y": "bottom",
    "itemWidth": 20,
    "itemHeight": 10,
    "selectedMode": false,
    "textStyle": {
      "color": "black",
      "fontWeight": "bold",
      "fontFamily": "\"Lucida Grande\", \"Lucida Sans Unicode\", Arial, Helvetica, sans-serif",
      "fontSize": 12
    },
    "data": [
      "7-7(四)",
      "7-6(三)",
      "7-5(二)",
      "7-4(一)" 
    ]
  },
  "color": [
    "#3398DB",
    "#2ECC71",
    "#E67E22",
    "#745EC5",
    "#E74C3C",
    "#FFCD00",
    "#D5C295",
    "#19BC9C",
    "#EF717A",
    "#98AAD4",
    "#A5C63A",
    "#79302A",
    "#34485E",
    "#BDC3C7",
    "#A5C63A",
    "#84C1E9",
    "#81E0A9",
    "#F0B17A",
    "#AB9EDC",
    "#F0938A",
    "#FFE166",
    "#E5DABF",
    "#75D6C3",
    "#F5A9AF",
    "#C1CCE5",
    "#C9DC88",
    "#AE827F",
    "#85919E",
    "#D7DBDD",
    "#C9DC88"
  ],
  "series": [
    {
      "name": "7-7(四)",
      "type": "line",
      "symbol": "circle",
      "symbolSize": 8,
      "data": [
        38628,
        10187,
        '-',
        '-',
        '-'
      ]
    },
    {
      "name": "7-6(三)",
      "type": "line",
      "symbol": "circle",
      "symbolSize": 8,
      "data": [
        48563,
        10944,
        8566,
        '-',
        '-'
      ]
    },
    {
      "name": "7-5(二)",
      "type": "line",
      "symbol": "circle",
      "symbolSize": 8,
      "data": [
        44933,
        11977,
        6407,
        6420,
        '-'
      ]
    },
    {
      "name": "7-4(一)",
      "type": "line",
      "symbol": "circle",
      "symbolSize": 8,
      "data": [
        43124,
        17021,
        10323,
        5894,
        5774
      ]
    }
  ]
}