el-form动态检验rules

需求：某个字段的下拉框根据选择的值，动态控制必填项是否必填

1、js中控制

<el-form ref="form" :rules="rules" :model="form" :show-message="false" style="padding: 0px" label-width="160px">
                <el-row class="row-change-label">
                  <el-col :span="12" :xs="24" >
                    <el-form-item label="xx" prop="xxx" class="ast-class input-dialog">
                      <el-input v-model="form.xxx" readonly placeholder="点击选择" />
                    </el-form-item>
                  </el-col>
                  <el-col :span="12" :xs="24" >
                    <el-form-item label="xxx" prop="xx" class="item-disabled">
                      <el-select v-model="form.xxx" placeholder="" @change="changeType" >
                        <el-option v-for="dict in selectDatas.applyType" :key="dict.dictValue" :label="dict.dictLabel" :value="dict.dictValue" />
                      </el-select>
                    </el-form-item>
                  </el-col>

                  <el-col :span="12" :xs="24" v-if="applyType == '1'" class="remove-borderBtm">
                    <el-form-item label="xxx" prop="rentType">
                      <el-select v-model="form.xxx"  placeholder="请选择xxx" clearable>
                        <el-option v-for="dict in selectDatas.rentType" :key="dict.dictValue" :label="dict.dictLabel" :value="dict.dictValue" />
                      </el-select>
                    </el-form-item>
                  </el-col>      
                  </el-row>
              </el-form> 
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 rules: {
        xxx: [
          {
            required: true,
            message: '请选择',
            trigger: 'change',
          },
        ],

        xxx: [
          {
            required: true,
            message: '请选择',
            trigger: 'blur',
          },
        ],
        xxx: [
          {
            required: true,
            message: '请输入',
            trigger: 'blur',
          },
        ],
      },
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changeType(value){
 if (value == 1) {
        for (let key in this.rules) {      
            this.rules[key][0].required = false      
        }
      } else {
        for (let key in this.rules) {
          this.rules[key][0].required = true
        }
      }
}
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更新~
2、在模板区动态控制必填项是否必填

      <el-form-item
                                class="input-dialog"
                                :prop="'tableData.' + rowIndex + '.xxx'"
                                :key="'tableData.' + rowIndex + '.xxx'"
                                :rules="
                                  row.yyy
                                    ? (rules.xxx= [{ required: true, message: '不能为空', trigger: 'blur' }])
                                    : (rules.xxx= [])
                                "
                              >
                                <EditRemarkInput
                                  v-model="row.xxx"                               
                                ></EditRemarkInput>
                              </el-form-item>
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