fix[Example]: fixed display_time always NaN bug (PanJiaChen#2001)

Author: dolonfly

src/views/example/components/ArticleDetail.vue

@@ -189,7 +189,7 @@ export default {
       this.$store.dispatch('tagsView/updateVisitedView', route)
     },
     submitForm() {
-      this.postForm.display_time = parseInt(this.display_time / 1000)
+      this.postForm.display_time = parseInt(this.postForm.display_time / 1000)
       console.log(this.postForm)
       this.$refs.postForm.validate(valid => {
         if (valid) {