vue使用 Object.assign()巧妙重置data数据

不爱吃糖的程序媛

发布于 2024-01-18 21:09:22

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发布于 2024-01-18 21:09:22

Object.assign()的用法

Object.assign方法用于对象的合并，将源对象（source）的所有可枚举属性，复制到目标对象（target）。 Object.assign方法的第一个参数是目标对象，后面的参数都是源对象。

const target = { a: 1 };

const source1 = { b: 2 };
const source2 = { c: 3 };

Object.assign(target, source1, source2);
target // {a:1, b:2, c:3}

浅拷贝

Object.assign方法实行的是浅拷贝，而不是深拷贝。也就是说，如果源对象某个属性的值是对象，那么目标对象拷贝得到的是这个对象的引用。

由于Object.assign()有上述特性，因此Vue组件需要重置Vue组件的data数据的需求时，我们可以这么用

源代码

 methods: {
    handleClose() {
      //通过this.$data获取当前状态下的data，通过this.$options.data()获取该组件初始状态下的data。
      //然后只要使用Object.assign(this.$data, this.$options.data())就可以将当前状态的data重置为初始状态
      Object.assign(this.$data, this.$options.data.call(this));//加这句话就可以清空
      this.$refs.forms.resetFields();
      this.$emit("resetGoodsInfo");
      this.$emit("handleClose");
    },
}

<template>
  <Dialog
    :title="$t('lang.leaveWarehouse')"
    :visible="visible"
    width="800px"
    :loading="loading"
    :btnName="$t('lang.submit')"
    @handleOk="handleOk"
    @handleClose="handleClose"
  >
    <div class="dialog-content">
      <el-form
        :model="ruleForm"
        :rules="rules"
        :validate-on-rule-change="false"
        ref="forms"
        label-width="120px"
        label-position="right"
      >
        <el-form-item :label="$t('lang.cargoName')" prop="goodsSn">
          <el-select
            v-model="ruleForm.goodsSn"
            filterable
            :placeholder="$t('lang.pleaseSelect')"
            :disabled="isCertainItem"
            @change="handleSelectGoods"
          >
            <el-option
              :label="
                item.goodsName.length > 40
                  ? item.goodsName.slice(0, 40) + '...'
                  : item.goodsName
              "
              :value="item.goodsSn"
              v-for="(item, index) in cargoList"
              :key="index"
            ></el-option>
          </el-select>
        </el-form-item>
        <el-form-item :label="$t('lang.specification')" prop="specificationId">
          <el-select
            v-model="ruleForm.specificationId"
            :placeholder="$t('lang.pleaseSelect')"
            :disabled="specificationList.length === 0 || isCertainItem"
            @change="handleSpecificationGoods"
          >
            <el-option
              :label="item.specification"
              :value="item.id"
              v-for="(item, index) in specificationList"
              :key="index"
            ></el-option>
          </el-select>
        </el-form-item>
        <el-form-item :label="$t('lang.currentStockLocation')" prop="shelvesSn">
          <div class="current-stock-locate">
            <div v-for="(item, index) in shelvesList" :key="index">
              <div
                class="location-item"
                :class="isSelectShow && mouseIndex == index ? 'clicked' : ''"
                @click="
                  selectCurrentLocation(
                    item.shelvesSn,
                    item.shelvesLevel,
                    item.id,
                    item.goodsCount,
                    item.goodsUnit,
                    index
                  )
                "
              >
                {{
                  `${item.shelvesSn} ${$t("lang.nth")}${item.shelvesLevel}${$t(
                    "lang.level"
                  )} ${item.goodsCount}${item.goodsUnit}`
                }}
              </div>
            </div>
          </div>
        </el-form-item>
        <el-form-item :label="$t('lang.leaveStockAmount')" prop="goodsCount">
          <div class="amount-unit">
            <el-input
              v-model.trim="ruleForm.goodsCount"
              :placeholder="$t('lang.pleaseEnter')"
              @blur="resetGoodsCount(ruleForm.goodsCount)"
            >
              <template slot="append">
                <div class="number-calc-icon">
                  <em
                    class="el-icon-caret-top"
                    @click="addNum(ruleForm.goodsCount)"
                  ></em>
                  <em
                    class="el-icon-caret-bottom"
                    @click="reduceNum(ruleForm.goodsCount)"
                  ></em>
                </div>
              </template>
            </el-input>
            <div class="unit">{{ goodsUnit }}</div>
          </div>
        </el-form-item>
         <el-form-item :label="$t('lang.claimant')" prop="checker">
          <el-input
            :rows="3"
            :maxlength="50"
            v-model="ruleForm.claimant"
            :placeholder="$t('lang.pleaseEnterClaimant')"
          ></el-input>
        </el-form-item>
        <el-form-item :label="$t('lang.remark')" prop="desc">
          <el-input
            type="textarea"
            :rows="3"
            :maxlength="200"
            v-model="ruleForm.recordDesc"
            :placeholder="$t('lang.pleaseEnter')"
          ></el-input>
        </el-form-item>
         <el-form-item prop="operateType">
           <el-checkbox v-model="checked" @change="changeCheckbox()" :label="$t('lang.returnSupplier')"></el-checkbox>
         </el-form-item>
      </el-form>
    </div>
  </Dialog>
</template>