Why do some components of iview bind key values?

<template>
    <Select v-model="model1" style="width:200px">
        <Option v-for="item in cityList" :value="item.value" :key="item.value">{{ item.label }}</Option>
    </Select>
</template>
Mar.04,2021

all loop components in vue need key


document

dom updates do not cause reuse exceptions.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e46712-270f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e46712-270f1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?