perf(@vant/lazyload): remove edge 15 polyfill

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

@@ -1,70 +1,68 @@
 import { h } from 'vue';
 import { inBrowser } from './util';
 
-export default (lazy) => {
-  return {
-    props: {
-      tag: {
-        type: String,
-        default: 'div',
+export default (lazy) => ({
+  props: {
+    tag: {
+      type: String,
+      default: 'div',
+    },
+  },
+
+  emits: ['show'],
+
+  render() {
+    return h(
+      this.tag,
+      this.show && this.$slots.default ? this.$slots.default() : null
+    );
+  },
+
+  data() {
+    return {
+      el: null,
+      state: {
+        loaded: false,
       },
+      rect: {},
+      show: false,
+    };
+  },
+
+  mounted() {
+    this.el = this.$el;
+    lazy.addLazyBox(this);
+    lazy.lazyLoadHandler();
+  },
+
+  beforeUnmount() {
+    lazy.removeComponent(this);
+  },
+
+  methods: {
+    getRect() {
+      this.rect = this.$el.getBoundingClientRect();
     },
 
-    emits: ['show'],
-
-    render() {
-      return h(
-        this.tag,
-        this.show && this.$slots.default ? this.$slots.default() : null
+    checkInView() {
+      this.getRect();
+      return (
+        inBrowser &&
+        this.rect.top < window.innerHeight * lazy.options.preLoad &&
+        this.rect.bottom > 0 &&
+        this.rect.left < window.innerWidth * lazy.options.preLoad &&
+        this.rect.right > 0
       );
     },
 
-    data() {
-      return {
-        el: null,
-        state: {
-          loaded: false,
-        },
-        rect: {},
-        show: false,
-      };
+    load() {
+      this.show = true;
+      this.state.loaded = true;
+      this.$emit('show', this);
     },
 
-    mounted() {
-      this.el = this.$el;
-      lazy.addLazyBox(this);
-      lazy.lazyLoadHandler();
+    destroy() {
+      return this.$destroy;
     },
-
-    beforeUnmount() {
-      lazy.removeComponent(this);
-    },
-
-    methods: {
-      getRect() {
-        this.rect = this.$el.getBoundingClientRect();
-      },
-
-      checkInView() {
-        this.getRect();
-        return (
-          inBrowser &&
-          this.rect.top < window.innerHeight * lazy.options.preLoad &&
-          this.rect.bottom > 0 &&
-          this.rect.left < window.innerWidth * lazy.options.preLoad &&
-          this.rect.right > 0
-        );
-      },
-
-      load() {
-        this.show = true;
-        this.state.loaded = true;
-        this.$emit('show', this);
-      },
-
-      destroy() {
-        return this.$destroy;
-      },
-    },
-  };
-};
+  },
+});

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

@@ -1,107 +1,105 @@
 import { inBrowser, loadImageAsync, noop } from './util';
 
-export default (lazyManager) => {
-  return {
-    props: {
-      src: [String, Object],
-      tag: {
-        type: String,
-        default: 'img',
+export default (lazyManager) => ({
+  props: {
+    src: [String, Object],
+    tag: {
+      type: String,
+      default: 'img',
+    },
+  },
+  render(h) {
+    return h(
+      this.tag,
+      {
+        attrs: {
+          src: this.renderSrc,
+        },
       },
-    },
-    render(h) {
-      return h(
-        this.tag,
-        {
-          attrs: {
-            src: this.renderSrc,
-          },
-        },
-        this.$slots.default
-      );
-    },
-    data() {
-      return {
-        el: null,
-        options: {
-          src: '',
-          error: '',
-          loading: '',
-          attempt: lazyManager.options.attempt,
-        },
-        state: {
-          loaded: false,
-          error: false,
-          attempt: 0,
-        },
-        rect: {},
-        renderSrc: '',
-      };
-    },
-    watch: {
-      src() {
-        this.init();
-        lazyManager.addLazyBox(this);
-        lazyManager.lazyLoadHandler();
+      this.$slots.default
+    );
+  },
+  data() {
+    return {
+      el: null,
+      options: {
+        src: '',
+        error: '',
+        loading: '',
+        attempt: lazyManager.options.attempt,
       },
-    },
-    created() {
+      state: {
+        loaded: false,
+        error: false,
+        attempt: 0,
+      },
+      rect: {},
+      renderSrc: '',
+    };
+  },
+  watch: {
+    src() {
       this.init();
-      this.renderSrc = this.options.loading;
-    },
-    mounted() {
-      this.el = this.$el;
       lazyManager.addLazyBox(this);
       lazyManager.lazyLoadHandler();
     },
-    beforeUnmount() {
-      lazyManager.removeComponent(this);
+  },
+  created() {
+    this.init();
+    this.renderSrc = this.options.loading;
+  },
+  mounted() {
+    this.el = this.$el;
+    lazyManager.addLazyBox(this);
+    lazyManager.lazyLoadHandler();
+  },
+  beforeUnmount() {
+    lazyManager.removeComponent(this);
+  },
+  methods: {
+    init() {
+      const { src, loading, error } = lazyManager._valueFormatter(this.src);
+      this.state.loaded = false;
+      this.options.src = src;
+      this.options.error = error;
+      this.options.loading = loading;
+      this.renderSrc = this.options.loading;
     },
-    methods: {
-      init() {
-        const { src, loading, error } = lazyManager._valueFormatter(this.src);
-        this.state.loaded = false;
-        this.options.src = src;
-        this.options.error = error;
-        this.options.loading = loading;
-        this.renderSrc = this.options.loading;
-      },
-      getRect() {
-        this.rect = this.$el.getBoundingClientRect();
-      },
-      checkInView() {
-        this.getRect();
-        return (
-          inBrowser &&
-          this.rect.top < window.innerHeight * lazyManager.options.preLoad &&
-          this.rect.bottom > 0 &&
-          this.rect.left < window.innerWidth * lazyManager.options.preLoad &&
-          this.rect.right > 0
-        );
-      },
-      load(onFinish = noop) {
-        if (this.state.attempt > this.options.attempt - 1 && this.state.error) {
-          if (!lazyManager.options.silent)
-            console.log(
-              `VueLazyload log: ${this.options.src} tried too more than ${this.options.attempt} times`
-            );
-          onFinish();
-          return;
+    getRect() {
+      this.rect = this.$el.getBoundingClientRect();
+    },
+    checkInView() {
+      this.getRect();
+      return (
+        inBrowser &&
+        this.rect.top < window.innerHeight * lazyManager.options.preLoad &&
+        this.rect.bottom > 0 &&
+        this.rect.left < window.innerWidth * lazyManager.options.preLoad &&
+        this.rect.right > 0
+      );
+    },
+    load(onFinish = noop) {
+      if (this.state.attempt > this.options.attempt - 1 && this.state.error) {
+        if (!lazyManager.options.silent)
+          console.log(
+            `VueLazyload log: ${this.options.src} tried too more than ${this.options.attempt} times`
+          );
+        onFinish();
+        return;
+      }
+      const { src } = this.options;
+      loadImageAsync(
+        { src },
+        ({ src }) => {
+          this.renderSrc = src;
+          this.state.loaded = true;
+        },
+        () => {
+          this.state.attempt++;
+          this.renderSrc = this.options.error;
+          this.state.error = true;
         }
-        const { src } = this.options;
-        loadImageAsync(
-          { src },
-          ({ src }) => {
-            this.renderSrc = src;
-            this.state.loaded = true;
-          },
-          () => {
-            this.state.attempt++;
-            this.renderSrc = this.options.error;
-            this.state.error = true;
-          }
-        );
-      },
+      );
     },
-  };
-};
+  },
+});

packages/vant-lazyload/src/util.js

@@ -1,31 +1,10 @@
-const inBrowser = typeof window !== 'undefined' && window !== null;
+const inBrowser = typeof window !== 'undefined';
 
-function checkIntersectionObserver() {
-  if (
-    inBrowser &&
-    'IntersectionObserver' in window &&
-    'IntersectionObserverEntry' in window &&
-    'intersectionRatio' in window.IntersectionObserverEntry.prototype
-  ) {
-    // Minimal polyfill for Edge 15's lack of `isIntersecting`
-    // See: https://github.com/w3c/IntersectionObserver/issues/211
-    if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) {
-      Object.defineProperty(
-        window.IntersectionObserverEntry.prototype,
-        'isIntersecting',
-        {
-          get() {
-            return this.intersectionRatio > 0;
-          },
-        }
-      );
-    }
-    return true;
-  }
-  return false;
-}
-
-export const hasIntersectionObserver = checkIntersectionObserver();
+export const hasIntersectionObserver =
+  inBrowser &&
+  'IntersectionObserver' in window &&
+  'IntersectionObserverEntry' in window &&
+  'intersectionRatio' in window.IntersectionObserverEntry.prototype;
 
 export const modeType = {
   event: 'event',
@@ -86,7 +65,7 @@ function getBestSelectionFromSrcset(el, scale) {
     return [tmpWidth, tmpSrc];
   });
 
-  result.sort(function (a, b) {
+  result.sort((a, b) => {
     if (a[0] < b[0]) {
       return 1;
     }
@@ -236,17 +215,13 @@ const loadImageAsync = (item, resolve, reject) => {
   };
 };
 
-const style = (el, prop) => {
-  return typeof getComputedStyle !== 'undefined'
+const style = (el, prop) =>
+  typeof getComputedStyle !== 'undefined'
     ? getComputedStyle(el, null).getPropertyValue(prop)
     : el.style[prop];
-};
 
-const overflow = (el) => {
-  return (
-    style(el, 'overflow') + style(el, 'overflow-y') + style(el, 'overflow-x')
-  );
-};
+const overflow = (el) =>
+  style(el, 'overflow') + style(el, 'overflow-y') + style(el, 'overflow-x');
 
 const scrollParent = (el) => {
   if (!inBrowser) return;