vue取自动生成的数组中单个元素的值

<view class="" v-for="(item,i) in detailTimePricesyd" :key="item">
      <!-- 时段/价格 -->
      <text class="uuu" v-if="item.salePrice!=0">{{i18n.SBD_Period_Price}}</text>
      <view :class="acb" v-if="item.salePrice!=0">
            <view class="sss">
                  <input class="uni-input" type="number" @input="onkeyInput" :data-type="'beginTime'+'-'+i" :v-model="'beginTime'+i"
                       maxlength="2" :value="item.beginTime" :name="'beginTime'+'-'+i" placeholder=" " />
            </view>
            <text class="szz">--</text>
            <view class="sss">
                  <input class="uni-input" type="number" @input="onkeyInput" :data-type="'endTime'+'-'+i" :v-model="'endTime'+i"
                       maxlength="2" :value="item.endTime" :name="'endTime'+'-'+i" placeholder=" " />
            </view>
            <!-- 时 -->
            <text class="szz">{{i18n.SBD_Hour}}</text>
            <view class="ssl">
                  <input class="ppi" type="number" maxlength="5" :value="item.salePrice"
                      :name="'salePrice'+'-'+i" placeholder=" " />
            </view>
            <image src="../../static/img/sta/sc_h.png" @click="deleteSw(i)" :class="ssh"></image>
      </view>
      <text class="hx" v-if="item.salePrice!=0"></text>
</view>

onkeyInput(e) {
                let type = e.currentTarget.dataset.type
                let from = 0;
                let to = 20;
                for (; from < to; from++) {
                    if (type == 'beginTime-'+from) {
                        let beginTime0 = e.target.value
                        if (beginTime0 > 24) {
                            uni.showToast({
                                icon: 'none',
                                title: this.SBD_greater_than_24
                            });
                            return
                        }
                        if (beginTime0 < 0) {
                            uni.showToast({
                                icon: 'none',
                                title: this.SBD_greater_than_0
                            });
                            return
                        }
                    }
                    if (type == 'endTime-'+from) {
                        let endTime0 = e.target.value
                        if (endTime0 > 24) {
                            uni.showToast({
                                icon: 'none',
                                title: this.SBD_greater_than_24
                            });
                            return
                        }
                        if (endTime0 < 0) {
                            uni.showToast({
                                icon: 'none',
                                title: this.SBD_greater_than_0
                            });
                            return
                        }
                    }
                }
            },