diff --git a/src/components/charts/LineChart.vue b/src/components/charts/LineChart.vue
index 72c10b6..55cf41e 100644
--- a/src/components/charts/LineChart.vue
+++ b/src/components/charts/LineChart.vue
@@ -71,7 +71,7 @@ export default {
       }),
     },
     unit: {
-      type: "String",
+      type: String,
       default: "单位/m³",
     },
     legend: {
diff --git a/src/components/isolate-area-1/Area.vue b/src/components/isolate-area-1/Area.vue
index fef2828..75e415e 100644
--- a/src/components/isolate-area-1/Area.vue
+++ b/src/components/isolate-area-1/Area.vue
@@ -31,7 +31,7 @@ export default {
   computed: {
     ...mapState(["fireDirection", "lastFireChangeTime", "fireChangeTime"]),
     rdata() {
-      let [_, min, sec] = /(\d+)分(\d+)秒/.exec(this.lastFireChangeTime)
+      let [_, min, sec] = /(\d+)分(\d+)秒/.exec(this.lastFireChangeTime || '0分0秒')
       min = +min 
       sec = +sec 
       let timer = setInterval(() => {
diff --git a/src/store/index.js b/src/store/index.js
index 4f8dbe4..c7c79d7 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -22,7 +22,7 @@ export default new Vuex.Store({
     fireDirection: "南火",
     kilnPressure: '00',
     fireChangeTime: '00:00:00',
-    lastFireChangeTime: '/',
+    lastFireChangeTime: '0分0秒',
     waterInTemp: '000',
     waterOutTemp: '000'
   },