视频原来是给“评价 按钮绑定bindtap，进入详情页，能获取到movieid。当我把bindtap绑定在一个电影上时，传过来的movieid是undefined，代码如下

<view class="movie" wx:for="{{movieList}}" wx:key="{{item.index}}" bindtap="goDetail" data-movieid="{{item.id}}">
    <image class="movie-img" src="{{item.images.small}}"></image>
    <view class="movie-info">
        <view class="movie-title">{{item.title}}</view>
        <view class="movie-score">评分：
            <text>{{item.rating.average}}分</text>
        </view>
        <view class="movie-actor">演员：
          <text wx:for="{{item.casts}}" wx:key="{{item.index}}">{{item.name}}</text>
        </view>
        <view>时长：{{item.durations}}</view>
    </view>
</view>