image&layer添加返回前提示

DAPlatform-front/src/components/imageAnnotation/imageAnnotiation.vue

@@ -308,6 +308,11 @@ export default {
   created () {
 
   },
+  beforeRouteLeave: function(to, from , next){
+    alert("返回后未保存的标注结果将会消失，请确认已保存！")
+    this.$destroy();
+    next();
+  },
   watch: {
     radio1: function f () {
       if (this.radio1 == '矩形标注') {

DAPlatform-front/src/components/imageAnnotation/layerAnnotation.vue

@@ -205,6 +205,11 @@
       this.init()
       this.restore()
     },
+    beforeRouteLeave: function(to, from , next){
+      alert("返回后未保存的标注结果将会消失，请确认已保存！")
+      this.$destroy();
+      next();
+    },
     watch: {
     radio1: function f () {
       if (this.radio1 == '地标') {