init

src/component/scroll/index.less

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+.layui-scroll {
+  height: 100%;
+  overflow: hidden !important;
+}
+
+.layui-scroll-y {
+  position: relative;
+  height: 100%;
+  .layui-scroll-wrap {
+    height: 100%;
+    overflow-y: scroll;
+    scrollbar-width: none;
+    -ms-overflow-style: none;
+  }
+
+  .layui-scroll-track {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    border-radius: 8px;
+    z-index: 20;
+    .layui-scroll-thumb {
+      margin: 0 auto;
+      border-radius: 6px;
+      cursor: default;
+    }
+  }
+}
+
+.layui-scroll-y ::-webkit-scrollbar {
+  display: none;
+}

src/component/scroll/index.ts

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+import { withInstall, WithInstallType } from "../../utils";
+import Component from "./index.vue";
+
+const component: WithInstallType<typeof Component> = withInstall(Component);
+export default component;

src/component/scroll/index.vue

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+<template>
+  <div
+    class="layui-scroll"
+    :class="{ hide: data.winWidth < 500 }"
+    :style="{ height: height }"
+  >
+    <div class="layui-scroll-y">
+      <div ref="scrollRef" class="layui-scroll-wrap" @scroll="onMosewheel">
+        <slot></slot>
+      </div>
+      <div
+        ref="barRef"
+        class="layui-scroll-track"
+        :style="{
+          backgroundColor: data.heightPre == 1 ? 'transparent' : trackColor,
+        }"
+      >
+        <div
+          :style="{
+            height: data.barHeight + 'px',
+            width: thumbWidth + 'px',
+            transform: 'translateY(' + data.translateY + 'px)',
+            backgroundColor: data.heightPre == 1 ? 'transparent' : thumbColor,
+          }"
+          class="layui-scroll-thumb"
+          @mousedown.stop.prevent="moveStart"
+        ></div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script lang="ts">
+export default {
+  name: "LayScroll",
+};
+</script>
+
+<script lang="ts" setup>
+import "./index.less";
+import { onMounted, nextTick, reactive, onUnmounted, ref } from "vue";
+
+export interface ScrollProps {
+  height?: string;
+  trackColor?: string;
+  thumbColor?: string;
+  thumbWidth?: number;
+}
+
+const props = withDefaults(defineProps<ScrollProps>(), {
+  height: "100%",
+  trackColor: "rgba(0,0,0,0)",
+  thumbColor: "#eeeeee",
+  thumbWidth: 6,
+});
+
+const emit = defineEmits(["arrive"]);
+
+const scrollRef = ref<HTMLElement | null | undefined>();
+const barRef = ref<HTMLElement | null | undefined>();
+
+const data = reactive({
+  translateY: 0, // 滚动块平移的距离
+  heightPre: 0, // 可视高度和内容高度比
+  barHeight: 0, // 滑块高度
+  winWidth: document.body.clientWidth, //初始化浏览器页面宽度
+});
+
+let time: NodeJS.Timeout; // 定时器
+let isMove = false; // 判断鼠标是否点击滑块（为松开）
+let moveClientY = 0; // 鼠标点击滑块时，相对滑块的位置
+let trackHeight = 0; // 滚动条轨道高度
+let wrapHeight = 0; // 容器高度（可视高度）
+let wrapContentHeight = 0; // 内容高度（可滚动内容的高度）
+
+onMounted(() => {
+  monitorWindow();
+  monitorScrollBar();
+  nextTick(() => {
+    calculationLength();
+  });
+});
+
+// 页面卸载清除定时器
+onUnmounted(() => {
+  window.clearInterval(time);
+});
+
+// 监听页面尺寸改变计算滚动条
+const monitorWindow = function () {
+  let time: NodeJS.Timeout;
+  window.addEventListener("resize", () => {
+    data.winWidth = document.body.clientWidth;
+    clearTimeout(time);
+    time = setTimeout(() => {
+      initScrollListner();
+    }, 500);
+  });
+};
+
+//监听内容元素尺寸变化
+const monitorScrollBar = function () {
+  // @ts-ignore
+  let MutationObserver =
+    window.MutationObserver ||
+    // @ts-ignore
+    window.WebKitMutationObserver ||
+    // @ts-ignore
+    window.MozMutationObserver;
+  const observer: any = new MutationObserver((mutations) => {
+    initScrollListner();
+  });
+
+  observer.observe(scrollRef.value, {
+    attributes: true,
+    childList: true,
+    subtree: true,
+  });
+};
+
+// 初始化延迟监听滚动条
+const calculationLength = function () {
+  // 直接执行initScrollListner函数，获取滚动条长度部准确
+  // 因为页面渲染有延迟，获取dom元素需要延迟
+  // 每间隔10毫秒更新滑块长度
+  time = setInterval(() => {
+    // 计算滚动条长度
+    initScrollListner();
+  }, 50);
+  // 间隔500毫秒清除定时器，滑块缩短会有动画效果，时间可延长没有影响
+  setTimeout(() => {
+    window.clearInterval(time);
+  }, 2000);
+};
+
+// 计算滚动条高度
+const initScrollListner = function () {
+  let scroll = scrollRef.value;
+  let bar = barRef.value;
+  // scroll有时候拿不到元素，要判断一下
+  if (scroll && bar) {
+    wrapContentHeight = scroll.scrollHeight;
+    wrapHeight = scroll.clientHeight;
+    trackHeight = bar.clientHeight;
+    data.heightPre = wrapHeight / wrapContentHeight;
+    data.barHeight = data.heightPre * trackHeight;
+  }
+};
+
+// 内容滚动时，计算滑块移动的距离
+const onMosewheel = (e: any) => {
+  data.translateY = e.target.scrollTop * data.heightPre;
+  if (data.translateY == 0) {
+    // 到达顶部
+    arrive("top");
+  } else if (
+    e.target.scrollTop + e.target.offsetHeight ==
+    e.target.scrollHeight
+  ) {
+    // 滚出高度 + 可视区域高度 == 内容高度
+    arrive("bottom");
+  }
+};
+
+// 到达顶部或者底部通知父级元素
+const arrive = (tb: string) => {
+  emit("arrive", tb);
+};
+
+// 鼠标点击滑块时
+const moveStart = (e: any) => {
+  isMove = true;
+  // clientY：当鼠标事件发生时，鼠标相对于浏览器（这里说的是浏览器的有效区域）y轴的位置
+  // data.translateY 滚动块平移的距离
+  // moveClientY 鼠标点击滑块时，相对滑块的位置
+  moveClientY = e.clientY - data.translateY;
+  moveTo(); //移动时
+  moveEnd(); //鼠标松开时
+};
+
+// 鼠标移动，改变thumb的位置以及容器scrollTop的位置
+const moveTo = () => {
+  document.onmousemove = (e) => {
+    // 移动时候判断是不是松开，松开就不在执行滑块移动操作
+    if (isMove) {
+      // 移动滑块时，判断时候到达顶部或者底部
+      if (e.clientY - moveClientY > trackHeight - data.barHeight) {
+        // 滑块到达  底部  就不在改变滑块translateY值
+        data.translateY = trackHeight - data.barHeight;
+      } else if (e.clientY - moveClientY < 0) {
+        // 滑块到达  顶部  就不在改变滑块 translateY 值
+        data.translateY = 0;
+      } else {
+        //改变滑块位置
+        data.translateY = e.clientY - moveClientY;
+      }
+      // 计算出内容盒子滚出顶部的距离
+      if (scrollRef.value) {
+        scrollRef.value.scrollTop = data.translateY / data.heightPre;
+      }
+    }
+  };
+};
+
+// 鼠标从滑块松开时，不在监听滑块移动操作
+const moveEnd = function () {
+  document.onmouseup = (e) => {
+    if (isMove) {
+      isMove = false;
+    }
+  };
+};
+</script>