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[Feature Request] BackTop 支持自定义 class 类名合并 #13790

@cc-hearts

Description

@cc-hearts

What problem does this feature solve?

当前如果要修改 van-back-top 的样式,通常需要直接覆盖其内部类名:

<style>
.van-back-top {
  background: red;
}
</style>

这样很容易带来全局 CSS 污染,影响其他页面或组件中的 BackTop组件。

What does the proposed API look like?

希望支持class合并:

<template>
 <van-back-top class="my-back-top" />
</template>

van-back-top 的根元素的 class 能够是: van-back-top my-back-top

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