改了image&layer布局，修改了离开前弹窗的逻辑

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

@@ -310,16 +310,22 @@ export default {
   },
   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！")
+    let i = 0
     this.$confirm('返回后未保存的标注结果将会消失，请确认已保存！', '提示', {
       confirmButtonText: '确定',
       cancelButtonText: '取消',
       type: 'warning'
     }).then(() => {
-      this.$destroy();
-      next();
+      this.$destroy()
+      next()
     }).catch(() => {
+      i = 1
+    })
 
-    });
+    if (i == 0) {
+      this.$destroy()
+      next()
+    }
     // this.$destroy();
     // next();
   },