elementui中的表单，根据条件判断切换是否必填

 <el-dialog title="新增放射源" custom-class="dialog" v-if="open" :visible.sync="open" width="50%" top="10vh">
      <el-form ref="form" class="formSelect" :rules="rules" :model="form" label-width="150px">
        <el-row class="dialog-form">
          <el-col :span="24">
            <el-form-item label="新增方式：">
              <el-radio-group v-model="form.addWay" @input="radioFormChange">
                <el-radio-button label="1">从全息档案中选择</el-radio-button>
                <el-radio-button label="2">手动输入</el-radio-button>
              </el-radio-group>
            </el-form-item>
            <el-form-item label="统一社会信用代码：" prop="creditCode" :rules='form.addWay==1?[{required:false}]:rules.creditCode'>
              <el-input placeholder="请输入统一社会信用代码" :disabled="form.addWay==1?true:false" v-model="form.creditCode"></el-input>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="cancel('form')">取 消</el-button>
        <el-button type="primary" @click="submitForm('form')">保 存</el-button>
      </div>
    </el-dialog>

open: false, //打开弹窗
form: {
  addWay: 1,
},

rules: {
   creditCode: [
     {
            required: true,
            message: "请输入统一社会信用代码",
            trigger: "change",
      },
    ],
},

 // 弹窗中的切换
    radioFormChange(val) {
      this.$refs.form.resetFields();
    },
  // 提交按钮
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          console.log("submit!");
        } else {
          console.log("error submit!!", this.form);
          return false;
        }
      });
    },
    //  取消
    cancel(formName) {
      this.$refs[formName].resetFields();
    },