neewbee opened a new issue #10570: 更改 tooltip -> axisPointer -> type 从任意不为 
‘none’ 更改为 ‘none’ 会报错
URL: https://github.com/apache/incubator-echarts/issues/10570
 
 
   ### Version
   4.1.0-release
   
   ### Steps to reproduce
   
   ```javascript
   const options = {
           title: {
             text: '堆叠区域图'
           },
           tooltip : {
             trigger: 'axis',
             axisPointer: {
               type: 'line',
               label: {
                 backgroundColor: '#6a7985'
               }
             }
           },
           legend: {
             data:['邮件营销','联盟广告','视频广告','直接访问','搜索引擎']
           },
           toolbox: {
             feature: {
               saveAsImage: {}
             }
           },
           grid: {
             left: '3%',
             right: '4%',
             bottom: '3%',
             containLabel: true
           },
           xAxis : [
             {
               type : 'category',
               boundaryGap : false,
               data : ['周一','周二','周三','周四','周五','周六','周日']
             }
           ],
           yAxis : [
             {
               type : 'value'
             }
           ],
           series : [
             {
               name:'邮件营销',
               type:'line',
               stack: '总量',
               areaStyle: {},
               data:[120, 132, 101, 134, 90, 230, 210]
             },
             {
               name:'联盟广告',
               type:'line',
               stack: '总量',
               areaStyle: {},
               data:[220, 182, 191, 234, 290, 330, 310]
             },
             {
               name:'视频广告',
               type:'line',
               stack: '总量',
               areaStyle: {},
               data:[150, 232, 201, 154, 190, 330, 410]
             },
             {
               name:'直接访问',
               type:'line',
               stack: '总量',
               areaStyle: {normal: {}},
               data:[320, 332, 301, 334, 390, 330, 320]
             },
             {
               name:'搜索引擎',
               type:'line',
               stack: '总量',
               label: {
                 normal: {
                   show: true,
                   position: 'top'
                 }
               },
               areaStyle: {normal: {}},
               data:[820, 932, 901, 934, 1290, 1330, 1320]
             }
           ]
         };
   myChar.setOption(options);
   
   setTimeout(() => {
     myChar.setOption({...options,
         tooltip: {
           trigger: 'axis',
           axisPointer: {
             type: 'none',
             lineStyle: {
               type: 'dashed'
             }
           }
         }
       });
   }, 1000)
   ```
   ### What is expected?
   x 轴指示器 消失
   
   ### What is actually happening?
   报错
   
   ---
   业务场景是鼠标移出后,折线图最新一个点的tooltip能显示出来
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   

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