wxml里的if else语句报错？

<view>今天是{{y}}，{{week}}。</view>
<view class="">今日课程</view>

<view wx:if="{{week === 星期一}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Monday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:elif="{{week===星期二}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Tuesday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:elif="{{week===星期三}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Wednesday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:elif="{{week===星期四}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Thursday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:elif="{{week===星期五}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Friday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:elif="{{week===星期六}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Saturday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>

<view wx:else="{{week===星期日}}">
  <view wx:for="{{list}}" wx:key="item">
  {{item.class}}
    <view wx:for="{{item.Sunday}}" wx:key="item">
      <text data-text="{{item}}">{{item}}\n</text>
    </view>
  </view>
</view>