fix:1.修复explore 表格无法显示的bug 2.explore图表悬浮时显示点

nezha-fronted/src/components/charts/chartDataFormat.js

@@ -255,6 +255,7 @@ function days(value,index,type=1){
 * unitIndex：不需要传递，用于递归获取units中的单位
 * */
 function asciiCompute(num,ascii,units,dot=2,unitIndex=0){
+  num=Number(num)
   let quotient=num / ascii;
   if(unitIndex <= units.length-1){
     if(quotient <1 ){ //不足以进位

nezha-fronted/src/components/page/dashboard/explore/explore.vue

@@ -304,7 +304,9 @@ instance_cpu_time_ns{app="fox", proc="widget", rev="4d3a513", env="prod", job="c
                     data.forEach((result, i) => {
                       let seriesItem = {
                         name: '',
-                        symbol: 'none',  //去掉点
+                        symbol:'emptyCircle',  //去掉点
+                        symbolSize:[2,2],
+                        showSymbol:false,
                         smooth: 0.2,  //曲线变平滑
                         data: [],
                         type: 'line',