DatePicker: add key prop to 'v-for' (#13547)

packages/date-picker/src/basic/time-spinner.vue

@@ -14,6 +14,7 @@
           @click="handleClick('hours', { value: hour, disabled: disabled })"
           v-for="(disabled, hour) in hoursList"
           class="el-time-spinner__item"
+          :key="hour"
           :class="{ 'active': hour === hours, 'disabled': disabled }">{{ ('0' + (amPmMode ? (hour % 12 || 12) : hour )).slice(-2) }}{{ amPm(hour) }}</li>
       </el-scrollbar>
       <el-scrollbar
@@ -28,6 +29,7 @@
         <li
           @click="handleClick('minutes', { value: key, disabled: false })"
           v-for="(enabled, key) in minutesList"
+          :key="key"
           class="el-time-spinner__item"
           :class="{ 'active': key === minutes, disabled: !enabled }">{{ ('0' + key).slice(-2) }}</li>
       </el-scrollbar>

packages/date-picker/src/panel/time-select.vue

@@ -11,6 +11,7 @@
           v-for="item in items"
           :class="{ selected: value === item.value, disabled: item.disabled, default: item.value === defaultValue }"
           :disabled="item.disabled"
+          :key="item.value"
           @click="handleClick(item)">{{ item.value }}</div>
       </el-scrollbar>
     </div>