wx:if 以及wx:else判断出现Bad attr `wx的错误 - WXOPEN Club

这样写有问题吗？会报Bad attr `wx的错误

<view class="first-con">

<view class='con-title'>余额明细</view>

</view>

<block wx:if='{{total > 0}}' wx:for-items='{{walletList}}' wx:key='{{index}}'>

<view class="list-box">

<view class="left">

<text class="word1">{{item.description}}\t{{item.orderId}}\n</text>

<text class="word2">{{item.createTime}}</text>

</view>

<view class="right blue number" wx:if="{{item.type == 1&&3}}">+{{item.sum}}</view>

<view class="right red number" wx:else>-{{item.sum}}</view>

</view>

</block>

<block wx:else>

<image src='/common/images/order/noOrder.png' class='no-orderimage'></image>

<view class='no-ordertext'> 没有搜索到相关数据</view>

</block>