在智能小程序的开发过程中，上拉加载是一种十分常见的加载效果，最近也收到了一些开发者在开发上拉加载时遇到的问题，今天的内容就为您介绍一下如果想实现上拉加载，我们需要如何去做。

以下是为大家总结的四种常见的实现方式：

使用 onReachBottom 实现
使用 scroll-view 组件实现
使用信息流模板实现上拉加载
使用 swiper 组件配合 onReachBottom 实现上拉加载
使用 onReachBottom 实现
智能小程序提供了onReachBottom，即页面上拉触底事件的处理函数。可以拿在 Page 中定义 onReachBottom 处理函数，监听该页面用户上拉触底事件，从而实现上拉加载。

为方便大家直接使用看到效果，将下述代码片段，直接导入开发者工具中运行查看即可： swanide://fragment/7e944c0c3785bbdf4437c672dd0dc8e41584413934361

工具下载链接：Windows /mac

代码解析
swan 文件是每个智能小程序页面的展现模板，类似于 Web 开发中的 HTML，所以我们先在 swan 文件中设置商品的展现样式：

     <view class="goodsList">
<block s-for="item,index in goods">
<view class="goodsItem">
<view class="goodsImage">
<image src="{{item.img}}"></image>
</view>
<view class="goodsTitle">
<text>{{item.title}}</text>
</view>
</view>
</block>
</view>
<view class="loading">努力加载中...</view>
在 js 文件中使用onReachBottom事件，当页面滑动到页面底部时，请求下一页展示数据，即实现上拉加载的效果。

...
...
onReachBottom() {
//触底时继续请求下一页展示的数据
this.initData();
}
更多内容参见onReachBottom

使用 scroll-view 组件实现
利用 scroll-view 组件实现上拉加载也是一种十分常见的方法，实现步骤与使用onReachBottom事件类似。

scroll-view是百度智能小程序提供的组件，可实现试图区域的横向滚动和竖向滚动。使用它的bindscrolltolower属性，当页面滚动到底部或右边的时候，则会触发scrolltolower事件，从而实现上拉加载的效果。

为方便大家直接使用看到效果，将下述代码片段，直接导入开发者工具中运行查看即可： swanide://fragment/fccd71b098a7d3921b9958ccd9dba1071584414516291

代码解析
在 swan 文件中使用 scroll-view 组件，设置商品的展现样式。当页面滑动至底部时，触发scrolltolower事件，实现试图区域的竖向滚动。

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