feat: use rollup to build component

packages/common/utils/scroll.js

@@ -0,0 +1,82 @@
+import Vue from 'vue';
+
+export default {
+  debounce(func, wait, immediate) {
+    var timeout, args, context, timestamp, result;
+    return function() {
+      context = this;
+      args = arguments;
+      timestamp = new Date();
+      var later = function() {
+        var last = (new Date()) - timestamp;
+        if (last < wait) {
+          timeout = setTimeout(later, wait - last);
+        } else {
+          timeout = null;
+          result = func.apply(context, args);
+        }
+      };
+      if (!timeout) {
+        timeout = setTimeout(later, wait);
+      }
+      return result;
+    };
+  },
+
+  // 找到最近的触发滚动事件的元素
+  getScrollEventTarget(element) {
+    var currentNode = element;
+    // bugfix, see http://w3help.org/zh-cn/causes/SD9013 and http://stackoverflow.com/questions/17016740/onscroll-function-is-not-working-for-chrome
+    while (currentNode && currentNode.tagName !== 'HTML' && currentNode.tagName !== 'BODY' && currentNode.nodeType === 1) {
+      var overflowY = this.getComputedStyle(currentNode).overflowY;
+      if (overflowY === 'scroll' || overflowY === 'auto') {
+        return currentNode;
+      }
+      currentNode = currentNode.parentNode;
+    }
+    return window;
+  },
+
+  // 判断元素是否被加入到页面节点内
+  isAttached(element) {
+    var currentNode = element.parentNode;
+    while (currentNode) {
+      if (currentNode.tagName === 'HTML') {
+        return true;
+      }
+      if (currentNode.nodeType === 11) {
+        return false;
+      }
+      currentNode = currentNode.parentNode;
+    }
+    return false;
+  },
+
+  // 获取滚动高度
+  getScrollTop(element) {
+    return 'scrollTop' in element ? element.scrollTop : element.pageYOffset;
+  },
+
+  // 设置滚动高度
+  setScrollTop(element, value) {
+    'scrollTop' in element ? element.scrollTop = value : element.scrollTo(element.scrollX, value);
+  },
+
+  // 获取元素距离顶部高度
+  getElementTop(element) {
+    if (element === window) {
+      return this.getScrollTop(window);
+    }
+    return element.getBoundingClientRect().top + this.getScrollTop(window);
+  },
+
+  getVisibleHeight(element) {
+    if (element === window) {
+      return element.innerHeight;
+    }
+
+    return element.getBoundingClientRect().height;
+  },
+
+  getComputedStyle: !Vue.prototype.$isServer && document.defaultView.getComputedStyle.bind(document.defaultView)
+};