chore[litemall-vue]: 删除无用代码

litemall-vue/src/components/_directive/scrollMore.js

-import { debounce } from 'lodash';
-import scroll from '@/utils/scroll';
-
-const CONTEXT = '$scrollArrow';
-const OFFSET = 30;
-
-// 绑定事件
-function startBind(el) {
-  const context = el[CONTEXT];
-
-  context.vm.$nextTick(() => {
-    if (scroll.isAttached(el)) {
-      doBindEvent.call(el[CONTEXT]);
-    }
-  });
-}
-
-// 绑定事件到元素上
-// 读取基本的控制变量
-function doBindEvent() {
-  if (this.el[CONTEXT].binded) {
-    return;
-  }
-  this.el[CONTEXT].binded = true;
-
-  this.scrollEventListener = debounce(handleScrollEvent.bind(this), 100);
-  //  this.scrollEventTarget = this.el;
-
-  //  var disabledExpr = this.el.getAttribute('waterfall-disabled');
-  //  var disabled = false;
-  //  if (disabledExpr) {
-  //    this.vm.$watch(disabledExpr, (value) => {
-  //      this.disabled = value;
-  //      this.scrollEventListener();
-  //    });
-  //    disabled = Boolean(this.vm[disabledExpr]);
-  //  }
-  //  this.disabled = disabled;
-
-  const offset = this.el.getAttribute('scroll-offset');
-  this.offset = Number(offset) || OFFSET;
-  this.el.addEventListener('scroll', this.scrollEventListener);
-
-  //	this.scrollEventListener();
-}
-
-// 处理滚动函数
-function handleScrollEvent() {
-  const element = this.el;
-  // 已被禁止的滚动处理
-  //	if (this.disabled) return;
-
-  const targetScrollLeft = scroll.getScrollLeft(element);
-  const targetVisibleWidth = scroll.getVisibleWidth(element);
-  // 滚动元素可视区域下边沿到滚动元素元素最顶上 距离
-  const targetRight = targetScrollLeft + targetVisibleWidth;
-  // 如果无元素高度，考虑为元素隐藏，直接返回
-  if (!targetVisibleWidth) return;
-
-  // 判断是否到了最右边
-  const isRightOver = element.scrollWidth - targetRight < this.offset;
-
-  // 判断是否到了最左边
-  const isLeftOver = targetScrollLeft < this.offset;
-
-  this.cb &&
-    this.cb({
-      target: element,
-      isRightOver,
-      isLeftOver
-    });
-
-  //	// 判断是否到了顶
-  //	let needLoadMoreToUpper =  targetScrollTop < this.offset;
-  //	if (needLoadMoreToUpper) {
-  //		this.cb.upper && this.cb.upper({
-  //			target: scrollEventTarget,
-  //			top: targetScrollTop
-  //		});
-  //	}
-}
-
-// 确认何时绑事件监听函数
-function doCheckStartBind(el) {
-  const context = el[CONTEXT];
-
-  if (context.vm._isMounted) {
-    startBind(el);
-  } else {
-    context.vm.$on('hook:mounted', () => {
-      startBind(el);
-    });
-  }
-}
-
-export default {
-  bind(el, binding, vnode) {
-    if (!el[CONTEXT]) {
-      el[CONTEXT] = {
-        el,
-        vm: vnode.context,
-        cb: {}
-      };
-    }
-    el[CONTEXT].cb = binding.value;
-
-    doCheckStartBind(el);
-  },
-  update(el) {
-    const context = el[CONTEXT];
-    context.scrollEventListener && context.scrollEventListener();
-  }
-};