小程序-動態設置頂部標題navigationBarTitleText

代碼如下：

<view class='assessment'>
<block wx:for="{{assessment}}">
  <view class='assessmentItem'>
      <view class='assessTitle'>1323123132</view>
      <block>
      <view class='assessContent'>
         <radio-group bindchange="change">
            <radio >1</radio>                             
            <radio >2</radio>
            <radio >3</radio>  
         </radio-group>     
      </view>    
      </block>  
   </view>
</block>
</view>

data: {
   _title: '生活自理能力',    
   assessment: [
         {},      
         {},      
         {},      
         {},      
         {},    
   ] 
},
change() {
    wx.setNavigationBarTitle({
          title: this.data._title    
    }) 
},