elementui 表单验证问题?

做一下自定义校验就行了。

例子就写一对，懒得全部都写了

data(){
  return {
    formData: {
      startDate:'',
      endDate:''
    },
    formRules: {
      startDate: {
        { validator: validateStartDate, trigger: 'change' }
      },
      endDate: {
        { validator: validateEndDate, trigger: 'change' }
      },
    }
  },
  methods: {
    validateStartDate(rule, value, callback) {
        if (!value && this.formData.endDate) {
          callback(new Error('请选择开始日期'));
        } else {
          callback();
        }
    },
    validateStartDate(rule, value, callback) {
        if (!value && this.formData.startDate) {
          callback(new Error('请选择结束日期'));
        } else {
          callback();
        }
    },
  }
}

当然也可以用计算函数来处理：

computed: {
  formRules() {
    const rules = {
      // 通用规则
    }
    if(this.formData.startDate) rules.endDate = { required: true, message: '请选择结束时间', trigger: 'change' }
    return rules
  }
}