微信小程序-数据处理

1.绑定类名

<view class="list-wrapper">
  <view class="list-top">
    <view data-num="1" class="list-menu list-menu1 {{_num==1?\'cur\':\'\'}}" bindtap="menuClick">头条</view>
    <view data-num="2" class="list-menu list-menu2 {{_num==2?\'cur\':\'\'}}" bindtap="menuClick">活动</view>
    <view data-num="3" class="list-menu list-menu3 {{_num==3?\'cur\':\'\'}}" bindtap="menuClick">公告</view>
  </view>
</view>

2.绑定输入框

（1）输入框
<input type=\'text\' bindchange=\'changInput\' data- placeholder=\'邮政编码\'></input>
（2）下拉选择时间
<picker bindchange="changInput" mode="date" value="{{postData.mail_time}}" start="2019-06-01" end="2020-09-01">
  <view class="picker">
    {{postData.mail_time}}
  </view>
</picker>
（3）下拉选择单项
<picker bindchange="changInput" data- value="{{indexPerson}}" range="{{arrayPerson}}">
  <view class="picker">
    {{arrayPerson[indexPerson]||\'请选择人数\'}}
  </view>
</picker>

当输入框变化时,方法changInput就了根据传过来的id来判断处理值
<script>
  changInput(e) {
    let id = e.currentTarget.dataset.id
    let value = e.detail.value
    if (id === 1) {
      this.setData({
        value: value
      })
    }
  }
</script>

3.数据遍历

<view wx:key="{{item}}" wx:for="{{pingData}}">
  {{item.user.nickname}}
</view>