uni-app 小程序端 v-for循环绑定事件传值触发时打印item为undefined

uni-app 小程序端 v-for循环绑定事件@event="func(item)"传值触发时打印item为undefined

				<swiper-item class="products_swiper_item" v-for="(item,index) in productSwiperImg" :key="index" @tap="toGoodDetail(item.product_id)">
					<view class="product_swiper_img">
						<image :src="item.image" mode="widthFix"></image>
					</view>
					<view class="product_swiper_text">
						<view class="upper_text">
							<text>{
     {
     item.title}}</text>
						</view>
						<view class="lower_text">
							<text>[市场价]</text>
							<text>￥{
     {
     item.price}}</text>
						</view>
					</view>
				</swiper-item>

key无效，把key换成index即可解决