Fixed DAG zoom in and zoom out nodes separated from arrows #1679 (#1680)

* Fix api url

* Fixed DAG zoom in and zoom out nodes separated from arrows

dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.scss

@@ -309,13 +309,13 @@ svg path:hover {
   //min-width: calc(100% - 220px);
   width: 8000px;
   height: 5000px;
-  position: relative;
   svg:not(:root){
     z-index: 11;
   }
 }
 
 .jtk-demo-canvas {
+  position: relative;
   height: 100%;
 }
 

dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.vue

@@ -161,7 +161,7 @@
       // DAG automatic layout
       dagAutomaticLayout() {
         $('#canvas').html('')
-
+        
       // Destroy round robin
         Dag.init({
         dag: this,
@@ -187,6 +187,13 @@
       })
         if (this.tasks.length) {
           Dag.backfill(true)
+          if (this.type === 'instance') {
+            this._getTaskState(false).then(res => {})
+            // Round robin acquisition status
+            this.setIntervalP = setInterval(() => {
+              this._getTaskState(true).then(res => {})
+            }, 90000)
+          }
         } else {
           Dag.create()
         }