[jsfm] Revert the destroy logic modification in #1529 (#1622)

Revert the modification of the destroy logic in #1529 , it may cause breaking change when
executing `destroyInstance`.

runtime/vdom/Document.js

@@ -200,29 +200,11 @@ export default class Document {
       debugLog(`[destroy](${this.id},document,${this.ref}) `
         + `Destroy document (id: "${this.id}", URL: "${this.URL}")`)
     }
-
-    removeDoc(this.id)
-    delete this.id
-    delete this.URL
-    delete this.documentElement
-    delete this.ownerDocument
-    delete this.body
-
-    // remove listener and taskCenter
-    delete this.listener
     this.taskCenter.destroyCallback()
-    delete this.taskCenter
-
-    // remove nodeMap
-    for (const id in this.nodeMap) {
-      try {
-        if (typeof this.nodeMap[id] !== 'undefined') {
-          this.nodeMap[id].destroy()
-        }
-      }
-      catch (e) {}
-    }
+    delete this.listener
     delete this.nodeMap
+    delete this.taskCenter
+    removeDoc(this.id)
   }
 }
 

runtime/vdom/Node.js

@@ -38,34 +38,10 @@ export default class Node {
     const doc = getDoc(this.docId)
     if (doc) {
       delete this.docId
-      delete this.ownerDocument
       delete doc.nodeMap[this.nodeId]
     }
-
-    // node props
-    delete this.nodeId
-    delete this.ref
-    delete this.parentNode
-    delete this.nextSibling
-    delete this.previousSibling
-
-    // element props
-    delete this.nodeType
-    delete this.type
-    delete this.attr
-    delete this.style
-    delete this.classStyle
-    delete this.event
-    delete this.depth
-
-    // child nodes
-    try {
-      this.children.forEach(child => {
-        child.destroy()
-      })
-    }
-    catch (e) {}
-    delete this.children
-    delete this.pureChildren
+    this.children.forEach(child => {
+      child.destroy()
+    })
   }
 }