vue实现自定义滚动条

具体效果如下，这边我用的rem单位，比例是1:40，

先写下页面布局，把原生的滚动条给隐藏掉，给自定义的滑块增加transition: marginLeft 1s linear;可以使左边距过度的更顺滑

 .top-box-2::-webkit-scrollbar {height: 0;}

  <div class="wrap"><!-- 滚动窗口 --><divclass="top-box-2"@scroll="onScroll"ref="box1"><divclass="top-item"v-for="(item,index) in 6":key="index"></div></div><!-- 自定义滚动条 --><divclass="bar"ref="bar"><!-- 滚动滑块 --><spanref="barInner":style="{'margin-left':barLeft+'px'}"></span></div></div>

首先我们要先获取滚动窗口的滚动百分比

 this.diff = this.$refs.box1.scrollWidth - this.$refs.box1.clientWidth; //获取原生滚动条可以滚动的距离，盒子的总宽度-盒子的可视宽度this.barWidth =this.$refs.bar.clientWidth - this.$refs.barInner.clientWidth; //获取自定义滚动条可以滚动的距离，盒子的总宽度-滑块的宽度

然后获取滚动盒子的百分比，然后设置自定义滚动条滑块的左边距

      this.radio = Math.ceil((e.target.scrollLeft * 100) / this.diff); //获取原生滚动盒子的百分比this.barLeft = this.barWidth * (this.radio / 100);   //计算自定义滑块左边距

下面是完整的代码

<template><div class="wrap"><!-- 滚动窗口 --><divclass="top-box-2"@scroll="onScroll"ref="box1"><divclass="top-item"v-for="(item,index) in 6":key="index"></div></div><!-- 自定义滚动条 --><divclass="bar"ref="bar"><!-- 滚动滑块 --><spanref="barInner":style="{'margin-left':barLeft+'px'}"></span></div></div>
</template><script>
export default {data() {return {diff: 0,scrollLeft: 0,radio: 0,barLeft: 0,barWidth: 0,barInnerWidth: 0,};},mounted() {// 延迟2秒执行获取元素宽度的方法，否则原生滚动条可以滚动的距离计算出来会是0setTimeout(() => {this.$nextTick(() => {this.init();});}, 2000);},methods: {init() {this.diff = this.$refs.box1.scrollWidth - this.$refs.box1.clientWidth; //获取原生滚动条可以滚动的距离，盒子的总宽度-盒子的可视宽度this.barWidth =this.$refs.bar.clientWidth - this.$refs.barInner.clientWidth; //获取自定义滚动条可以滚动的距离，盒子的总宽度-滑块的宽度},onScroll(e) {this.radio = Math.ceil((e.target.scrollLeft * 100) / this.diff); //获取原生滚动盒子的百分比this.barLeft = this.barWidth * (this.radio / 100); //计算自定义滑块左边距},},
};
</script><style lang='scss' scoped>
.wrap {.top-box-2::-webkit-scrollbar {height: 0;}.top-box-2 {display: flex;height: 5rem;overflow-x: scroll;margin: 0 2rem;.top-item {flex-shrink: 0;width: 4rem;height: 3rem;border: 0.04rem solid red;margin: 0.5rem;box-sizing: border-box;&:first-child {margin: 0.5rem 0.5rem 0.5rem 0;}&:last-child {margin: 0.5rem 0 0.5rem 0.5rem;}}}.bar {width: 3rem;border-radius: 0.5rem;height: 0.5rem;border: 0.02rem solid red;margin: 0 auto;span {display: block;width: 0.8rem;height: 0.5rem;background: blueviolet;border-radius: 0.5rem;transition: marginLeft 1s linear;}}
}
</style>