fix comment

@@ -124,6 +124,8 @@ export default {
         if (params.rootCommentId) {
           this.page = get(result, 'data.page', 1);
           this.prePage = this.page - 1;
+        } else {
+          this.prePage = 0;
         }
 
         this.totalPage = get(result, 'data.totalPage', 1);
@@ -173,8 +175,9 @@ export default {
                   let scrollHeight = this.$refs.scroll.$el.offsetHeight;
                   let dom = this.$refs.commentList.getElementsByClassName('comment-' + this.commentId);
 
-                  if (scrollHeight && dom.length && (dom[0].offsetHeight + dom[0].offsetoffsetTop > scrollHeight)) {
-                    this.$refs.scroll.scrollTo(0, scrollHeight - this.$refs.commentList.offsetoffsetTop);
+                  if (scrollHeight && dom.length && (dom[0].offsetHeight + dom[0].offsetTop > scrollHeight)) {
+                    console.log(scrollHeight - this.$refs.commentList.offsetHeight)
+                    this.$refs.scroll.scrollTo(0, scrollHeight - this.$refs.commentList.offsetHeight);
                   }
                 }, 500);
               }
@@ -209,7 +212,7 @@ export default {
     onScrollEndHandle(e) {
       this.scrollY = e.y;
 
-      if (this.prePage < 1) {
+      if (!this.commentId || this.prePage < 1) {
         return;
       }