fix(Lazyload): directive update is removed

packages/vant-lazyload/src/index.js

@@ -26,8 +26,7 @@ export const Lazyload = {
 
     app.directive('lazy', {
       beforeMount: lazy.add.bind(lazy),
-      update: lazy.update.bind(lazy),
+      updated: lazy.update.bind(lazy),
-      updated: lazy.lazyLoadHandler.bind(lazy),
       unmounted: lazy.remove.bind(lazy),
     });
 

packages/vant-lazyload/src/lazy-component.js

@@ -9,14 +9,16 @@ export default (lazy) => {
         default: 'div',
       },
     },
+
     emits: ['show'],
+
     render() {
       return h(
         this.tag,
-        null,
         this.show && this.$slots.default ? this.$slots.default() : null
       );
     },
+
     data() {
       return {
         el: null,
@@ -27,18 +29,22 @@ export default (lazy) => {
         show: false,
       };
     },
+
     mounted() {
       this.el = this.$el;
       lazy.addLazyBox(this);
       lazy.lazyLoadHandler();
     },
+
     beforeUnmount() {
       lazy.removeComponent(this);
     },
+
     methods: {
       getRect() {
         this.rect = this.$el.getBoundingClientRect();
       },
+
       checkInView() {
         this.getRect();
         return (
@@ -49,11 +55,13 @@ export default (lazy) => {
           this.rect.right > 0
         );
       },
+
       load() {
         this.show = true;
         this.state.loaded = true;
         this.$emit('show', this);
       },
+
       destroy() {
         return this.$destroy;
       },