using nextTick instead of setTimeout 20

src/components/picker/picker.vue

@@ -200,13 +200,14 @@
         wheel.wheelTo(dist)
       },
       refresh() {
-        setTimeout(() => {
+        this.$nextTick(() => {
           this.wheels.forEach((wheel) => {
             wheel.refresh()
           })
-        }, 200)
+        })
       },
       _createWheel(wheelWrapper, i) {
+        if (!this.wheels[i]) {
           const wheel = this.wheels[i] = new BScroll(wheelWrapper.children[i], {
             wheel: {
               selectedIndex: this.pickerSelectedIndex[i] || 0
@@ -215,7 +216,10 @@
           wheel.on('scrollEnd', () => {
             this.$emit(EVENT_CHANGE, i, wheel.getSelectedIndex())
           })
-        return wheel
+        } else {
+          this.wheels[i].refresh()
+        }
+        return this.wheels[i]
       },
       _canConfirm() {
         return this.wheels.every((wheel) => {

src/components/scroll/scroll.vue

@@ -127,9 +127,9 @@
       this.pullDownInitTop = -50
     },
     mounted() {
-      setTimeout(() => {
+      this.$nextTick(() => {
         this.initScroll()
-      }, 20)
+      })
     },
     methods: {
       initScroll() {