1.app.json文件，添加
"useExtendedLib": {
"weui": true
}
2.页面文件，userCenter.json添加
"usingComponents": {
"mp-cells": "weui-miniprogram/cells/cells",
"mp-cell": "weui-miniprogram/cell/cell",
"mp-icon": "weui-miniprogram/icon/icon"
}
3.页面,userCenter.wxml添加
<mp-cells ext-class="my-cells" title="带说明的列表项">
<mp-cell value="标题文字" footer="说明文字"></mp-cell>
<mp-cell>
<view>标题文字（使用slot）</view>
<view slot="footer">说明文字</view>
</mp-cell>
</mp-cells>
