fix: echartstip add des text

src/views/external/camera/components/Detail.vue

@@ -311,7 +311,7 @@ export default {
       this.player = null
     },
     stopbtn () {
-      if (this.imgUrl.stop === this.imgUrl.start) {
+      if (this.$refs.player.paused) {
         this.imgUrl.stop = require('@/assets/icon_stop.png')
         this.player.play()
       } else {
@@ -503,7 +503,7 @@ export default {
           }
         ],
         tooltip: {
-          formatter: '{b}<br />{c}'
+          formatter: '时间：{b}<br />人流量：{c}'
         }
       }
       option && myChart.setOption(option)