Vue项目element-ui 添加动态校验

需求：一个表单中某个字段，根据另一个字段变化，校验是否必填

　　<el-form ref="detail" :model="detail" :rules="ruleData" size="small" label-width="100px">
        <el-card>
          <el-row>
            <el-col :span="12">
              <el-form-item label="范围" prop="type" label-width="220px">
                <el-select v-model="detail.type" style="width: 100%" clearable placeholder="请选择" @change="typeChange()">
                  <el-option label="分步" value="01"> </el-option>
                  <el-option label="最终" value="02"> </el-option>
                </el-select>
              </el-form-item>
            </el-col>
            <el-col :span="12">
              <el-form-item label="数量" prop="number" label-width="220px">
                <el-input v-model="detail.number" type="number" style="width: 100%"> </el-input>
              </el-form-item>
            </el-col>
          </el-row>
        </el-card>
      </el-form>

  typeChange () {
    if (String(this.detail.type) === '02') {
      this.$delete(this.ruleData, 'number');
    } else {
      this.ruleData = { ...this.rules, number: this.otherRule.number };
    }
    (this.$refs.detail as any).clearValidate();
  }

  rules = {
    type: [{ required: true, message: '请选择', trigger: 'blur' }],
  };

  otherRule = {
    number: [{ required: true, message: '请输入', trigger: 'blur' }],
  };

  ruleData = { ...this.rules, number: this.otherRule.number };