我做上拉刷新的时候必须要下拉一下再上拉才能触发

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<view class=“upload” wx:if="{{up == true}}">加载数据中…</view>

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<view class=“listimg”>

<image src ="{{item.imgUrls}}"></image>

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<view class=“title titlefont fontstyle”>{{item.title}}</view>

<view class=“title contentfont fontstyle”>{{item.room}}室{{item.parlour}}厅{{item.kitchen}}厨{{item.bathroom}}卫.{{item.area}}㎡.{{item.direction}}.</view>

<view class=“title contentfont fontstyle”>{{item.road}}.{{item.district}}</view>

<view class=“title contentfont fontstyle”>{{item.type}}</view>

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