fix

src/components/ScrollAffix/index.vue

@@ -66,6 +66,8 @@ export default {
       }
     },
     setPlaceHolder () {
+      this.showPlaceHolder = true
+
       const instanceRect = this.getInstanceRect()
       this.stylePlaceHolder = {
         width: instanceRect.width,
@@ -76,8 +78,6 @@ export default {
       if (this.defaultInstancePosition < this.offsetTop) {
         this.setFixedForInstance()
 
-        this.showPlaceHolder = true
-
         this.setPlaceHolder()
       }
 
@@ -96,6 +96,7 @@ export default {
 
       if (isArrivalDefault && this.affixStyle.position === 'fixed') {
         this.affixStyle = {}
+        this.showPlaceHolder = false
         this.stylePlaceHolder = {}
       }
     }