Fix bug in throttle function

Author: stackjie

src/utils.js

@@ -6,10 +6,12 @@ export function extend (target, source) {
 
 export function throttle (fn, delay) {
   let timer = null;
-  return () => {
+  return function() {
+    const context = this;
+    const args = arguments;
     clearTimeout(timer);
     timer = setTimeout(() => {
-      fn();
+      fn.apply(context, args);
     }, delay);
   };
 }

src/vue-enhanced-scroller.vue

@@ -220,17 +220,15 @@
 
       handleScroll() {
         if (this.checkBottomReached()) {
-          throttle(() => {
-            this.$emit('infinite-scroll');
-          }, 100)();
+          this.$emit('infinite-scroll');
         }
       },
 
       bindEvents() {
         this.scrollEl.addEventListener('touchstart', this.handleTouchStart);
         this.scrollEl.addEventListener('touchmove', this.handleTouchMove);
         this.scrollEl.addEventListener('touchend', this.handleTouchEnd);
-        this.scrollEl.addEventListener('scroll', this.handleScroll);
+        this.scrollEl.addEventListener('scroll', throttle(this.handleScroll, 500));
       },
 
       init() {