Now you can provide attr `wx:key` for a `wx:for` ?
WXMLRT_$gwx:./weui-miniprogram/tabbar/tabbar.wxml:view:3:4: Now you can provide attr `wx:key` for a `wx:for` to improve performance.
什么意思
<view class="weui-tabbar {{extClass}}"><!-- 选中的时候往weui-tabbar__item加class:weui-bar__item_on --><view data-index='{{index}}' bindtap="tabChange" wx:for="{{list}}" class="weui-tabbar__item {{index === current ? 'weui-bar__item_on' : ''}}"><view style="position: relative;display:inline-block;"><image src="{{current === index ? item.selectedIconPath : item.iconPath}}" class="weui-tabbar__icon"></image><mp-badge wx:if="{{item.badge}}" content="{{item.badge}}" style="position: absolute;top:-2px;left:calc(100% - 3px)"></mp-badge></view><view class="weui-tabbar__label">{{item.text}}</view></view></view> |
要加wx:key="index"，跟react中的key可以一样，有利于渲染性能的。
wx:for 要加 wx:key="index"