【VUE】自动生成表单验证规则扩展方法

export function createRulesByForm(form = {}, rules = [
  { required: true, message: ‘这项是必填的‘, trigger: ‘blur‘ },
  { required: true, message: ‘这项是必填的‘, trigger: ‘change‘ }
]) {
  const rulesStr = JSON.stringify(rules) // 拷贝一个默认规则转为字符串存储,防止后面操作规则对象修改到了原规则
  const rulesRequired = {} // 创建规则对象
  const lables = form?.$el?.getElementsByTagName(‘label‘)// 获取所有需要验证的lable
  if (lables && lables.length > 0) {
    lables.forEach(it => { // 循环操作lable
      rules = JSON.parse(rulesStr) // 将规则转为对象
      const rule = it.getAttribute(‘for‘) // 获取需要规则的对象名 即prop值
      if (rule && rule.length > 0) {
        const msg = it.parentElement.getAttribute(‘msg‘) // 获取自己配置的msg
        rules.forEach(r => { // 循环修改rules的msg
          if (msg && msg.length > 0) {
            r.message = msg
          }
        })
        rulesRequired[rule] = rules // 添加对应的rules
      }
    })
  }

  return rulesRequired
}