小程序-Now you can provide attr "wx:key" for a "wx:for" to improve performance

小程序開發-Now you can provide attr "wx:key" for a "wx:for" to improve performance

當我們開發微信小程序用到"wx:for"時可能會在控制台報"Now you can provide attr "wx:key" for a "wx:for" to improve performance"警告

不要慌張這只是警告不妨礙運行，消除警告只需要在"wx:for"后面添加wx:key="xxx" 就行了，例如這樣：

<block wx:for="{{imgUrls}}" wx:key="">
      <swiper-item>
        <image src="{{item}}" class='lfsc-topimg' />
      </swiper-item>
</block>