写法一：在弹窗外层添加：@touchmove.stop.prevent="()=>false"
写法二：在弹窗外层添加： @touchmove.prevent

<template>
	<view>
		<view v-for="(item,i) in 100" :key="i">list</view>
		<view class="Popup" @touchmove.prevent>
			<view class="Popup_">
				弹窗
			</view>
		</view>

	</view>
</template>

<style lang="scss" scoped>
.Popup {
	width: 100vw;
	height: 100vh;
	position: fixed;
	top: 0;
	left: 0;
	z-index: 9999;
	background: rgba(0, 0, 0, 0.4);
	display: flex;
	justify-content: center;
	align-items: center;

	.Popup_ {
		width: 389rpx;
		background: #FFFFFF;
		border-radius: 14rpx;
	}
}
</style>