原生小程序测试没问题，而且预览图片有方法，并不需要自己写长按属性

<template>  

 <view v-if="isshow"  class="w-full fixed top-0 bottom-0 bg-[rgb(0,0,0,0.5)] z-[9999] flex items-center justify-center">  

    <view class="absolute w-[80%] flex flex-col items-center rounded-[10px] bg-[#FDEDE0] box-border pb-[35px]">  

      <view class="w-full">  

        <!-- 根据fullimg的值动态改变src -->  

        <image  show-menu-by-longpress ="true"

          :src="fullimg ? qiweixininfo.img : staticurl + '156.png'"  

          class="w-full rounded-[10px]" 

          mode="widthFix"  

        />  

      </view>  

      <view class="absolute w-full h-full flex flex-col">  

        <!-- 当fullimg为true时，不渲染这个view -->  

        <view  class="flex-1 flex justify-center">  

          <view v-if="!fullimg" class="w-[160rpx] h-[160rpx] bg-[#000] mt-[315rpx]">  

            <image show-menu-by-longpress="true" lazy-load :src="qiweixininfo.img" class="w-full h-full" />  

          </view>  

        </view>  

        <view class="flex-[0_1_40px] flex items-center justify-center">  

          <view v-if="!isclose" class="text-[#666] text-[13px]">  

            需要等待 {{ qiweixininfo.wait }} 秒后才能关闭  

          </view>  

          <view   @click="close" v-else class="bg-[#E84545] p-[5px_10px] rounded-[5px]">  

            <view class="text-[12px] text-[#fff]">关闭</view>  

          </view>  

        </view>  

      </view>  

    </view>  

  </view>  

</template>

<script setup>

import { ref } from 'vue'

import base from '@/utils/base'

import appUser from '@/api/app/user'

import { staticurl } from '@/env'

import appSystem from '@/api/app/system'

const isshow = ref(false)

const qiweixininfo = ref({})

const isclose = ref(false)

const fullimg = ref(false)

let time

const getisqiweiimg = async () => {

    const res = await appSystem.getconfig({ key: 'is_qiwei_img' })

    return res.data

}

const open = async () => {

  if(await getisqiweiimg()){

fullimg.value = true

  }

  isshow.value = true

  isclose.value = false

  const res = await appUser.qiweixininfo()

  qiweixininfo.value = res.data

  // qiweixininfo.value.wait = 3

  clearInterval(time)

  time = setInterval(() => {

    qiweixininfo.value.wait--

    if (qiweixininfo.value.wait == 0) {

      clearInterval(time)

      isclose.value = true

    }

  }, 1000)

}

const close = () => {

  isshow.value = false

}

const getisshow = () => {

  return isshow.value

}

defineExpose({ open, getisshow })

</script>

上面是我的代码，然后这是弹窗效果，长按没效果