if

<block wx:if="{{result.child_items}}">
    ...
</block>
<block wx:else>
    ...
</block>

for

<block wx:for="{{result.child_items}}">
    <block wx:if="{{item.status == 1}}">
        <view class="go_finish_btn" data-id="{{item.id}}" bindtap="do_finish_item">核销【{{item.name}}】</view>
    </block>
    <block wx:if="{{item.status != 1}}">
        <view class="finished_btn">
        【{{item.name}}】已核销
        </view>
    </block>
</block>

确认提示

wx.showModal({
  title: '提示',
  content: '确认进行该操作吗?',
  success (res) {
    if (res.confirm) {
      console.log('用户点击确定')
    } else if (res.cancel) {
      console.log('用户点击取消')
    }
  }
})

常规提示

wx.showModal({
    title: '提示',
    content: data.errdesc
});

获取参数值

<view class="go_finish_btn" data-id="{{item.id}}" bindtap="do_finish_item">核销【{{item.name}}】</view>

do_finish_item: function(e) {
    var child_item_id = e.currentTarget.dataset.id;
}

跳转到菜单页

wx.switchTab({
    url: '/pages/index/index'
});

跳转到页面，并关闭当前页

wx.redirectTo({
    url: '/pages/product/index?id=' + id,
})

跳转到下一页，可以返回上一页

wx.navigateTo({
    url: '/pages/product/index?id=' + id,
})

小程序常用操作，if，for，跳转，弹出提示