两个文件，一个写逻辑，一个写校验规则；

特点：逻辑简单，代码量少，够用；

不想看代码直接新建这两个文件复制代码，看最下面的使用方法；

示例图片

//validator.js
//引入校验规则
var valitatorRules = require('./valitator-rules.js');
 
export const Validator=function(formName,rules,errors){
// rules：{
//   name:'required|regexp_hanzi',
//   idCont: 'regexp_I'
// }
this.rules = rules;
// let errors = {
//   name:{
//     required:'不能为空',
//     regexp_hanzi:'得是汉字'
//   },
//   idCont:{
//     regexp_I:'身份证号不对',
//     regexp_H:'香港通行证不对',
//     regexp_T:'台湾通行证不对',
//   }
// };
this.error = errors;
this.form = document.forms[formName];
this.validatorList = [];
this.init();
}
//初始化
Validator.prototype.init = function(){
for (let key in this.rules){
  let node = this.findNode(key);
  this.validatorList.push({
    name: key,
    value: '',
    childrenNode:node.childrenNode,
    parentNode: node.parentNode,
    borderColor:getComputedStyle(node.childrenNode).borderColor,
    ruleReg:this.defineRule(key),//[{rule:'hanzi',valitatorRules:fn(this.value),error:'请输入汉字'}]
    errors :'',
  })
}
};
//动态修改校验规则
Validator.prototype.changeRules = function(rules,param){
let arrs = Object.keys(rules);
this.rules = {
  ...this.rules,
  ...rules
}
this.validatorList.forEach(val => {
  if(arrs.includes(val.name)){
    val.ruleReg = this.defineRule(val.name)
  }
})
if(param){
  return this.validate(param)
}
};
//校验执行者
Validator.prototype.validate = function(param){
let errorList =[];
return new Promise((resolve,reject) => {
  for (let key in param){
    this.validatorList.forEach(val => {
      if(val.name == key){
        val.value = param[key];
        this.runValidator(val);
      }
    })
     
  }
 
  this.validatorList.forEach(val => {
    Object.keys(param).forEach(v => {
      if(val.name == v && val.errors){
        errorList.push(val);
      }
    })
  })
  if(errorList.length > 0){
    reject(this)
  }else{
    resolve()
  }
})
}
//暴露出的展示错误
Validator.prototype.showError = function(name){
if(name){
  let module;
  this.validatorList.forEach(val => {
    if(val.name == name){
      module = val;
    }
  })
  if(module.errors){
    this.createError(module);
  } 
   
}else{
  this.validatorList.forEach(val => {
    if(val.errors){
      this.createError(val);
    }
     
  }) 
}
 
}
//执行校验工具；
Validator.prototype.runValidator = function(module){
 
let n = 0;
function run(param){
  if (n>=module.ruleReg.length){
    return
  }
  if(param.valitatorRules(module.value)){// 验证通过
    module.errors = '';
    n++;
    run(module.ruleReg[n]);
     
  } else{
    module.errors = param.error;
  }
}  
run(module.ruleReg[n]);
 
if(module.errors.length == 0 && module.newChildNode){
  this.clear(module);
}
}
//寻找节点
Validator.prototype.findNode= function(childenName){
let form = this.form;
let childrenNode = form.querySelector(`input[name="${childenName}"]`) || form.querySelector(`textarea[name="${childenName}"]`);
let parentNode = childrenNode.parentNode;
return {
  childrenNode,
  parentNode
}
};
//寻找验证规则
Validator.prototype.defineRule =function(name){
let rule = [],ruleString='';
for(let key in this.rules){
  if(name == key){
    ruleString = this.rules[key];
  }
}
let arr= ruleString.split('|');
 
arr.forEach(val => {
  if(valitatorRules[val]){
    console.log(this)
    rule.push({
      rule:val,
      valitatorRules:valitatorRules[val],
      error:this.error[name][val]
    })
  }
})
 
return rule;
}
//生产错误提示
Validator.prototype.createError = function(module){
if(module.newChildNode){
  module.newChildNode.innerText = module.errors;
  return
}
let newChildNode = document.createElement('div');
newChildNode.className='_errorMessage';
newChildNode.style.color = 'red';
newChildNode.style.fontSize = '12px';
newChildNode.innerText = module.errors;
module.newChildNode = newChildNode;
module.childrenNode.style.borderColor = 'red';
if(module.childrenNode.nextSibling){
  module.parentNode.insertBefore(newChildNode,module.childrenNode.nextSibling);
}else{
  module.parentNode.appendChild(newChildNode);
}
}
//清除错误提示
Validator.prototype.clear = function(module){
if(module){
  module.childrenNode.style.borderColor = module.borderColor;
  module.parentNode.removeChild(module.newChildNode);
  module.newChildNode = null;
}else{
  this.validatorList.forEach(val => {
    if(val.newChildNode){
      val.childrenNode.style.borderColor = val.borderColor;
      val.parentNode.removeChild(val.newChildNode);
      val.newChildNode = null;
    }
  })
}
}

下面是校验规则，就更简单

说明一下，非空校验没有做单独处理，所以校验规则这里就多写个if else;

//validator-rule.js
module.exports= {
hanzi:function(str){
  if(str){
    let reg = /[\u4e00-\u9fa5]/;
    return reg.test(str);
  }else{
    return true;
  }
   
},
required:function(str){
  return !(str.length == 0)
},
I:function(str){
  if(str){
    let reg = /i/;
    return reg.test(str);
  }else{
    return true;
  }
},
H:function(str){
  if(str){
    let reg = /h/;
    return reg.test(str);
  }else{
    return true;
  }
},
T:function(str){
  if(str){
    let reg = /t/;
    return reg.test(str);
  }else{
    return true;
  }
},
}

使用方法

**引入校验插件 import {Validator} from '@src/utils/valitator'**
  **校验规则可自行修改添加 @src/utils/valitator-rules**
  ****
  1.添加form name属性<form name='example_form'></form>
  2.定义错误提示errors = {
    name:{
      required:'不能为空',
      hanzi:'得是汉字'
    },
    idCont:{
      I:'身份证号不对',
      H:'香港通行证不对',
      T:'台湾通行证不对',
    }
  };

3.定义校验规则

rules ={
    name:'required|hanzi',
    idCont: 'I'
  }

4.初始化校验实例：this.Validator =new Validator('example_form',rules,errors);

5.绑定校验信息：input增加name属性，保持和错误提示key一致 <input type="text" name='name' v-model='name'>

6.执行校验：传入要校验的key和value;

this.Validator.validate({
   [name]:this[name],
 }).then(()=>{
 
 }).catch((errorCb)=>{
   console.log(errorCb)
   errorCb.showError();//展示错误提示，如果只展示某个提示，传入对应的值errorCb.showError('name')
 });

7.动态跟换校验规则，如证件类型更换：

this.Validator.changeRules(
  {idCont:this.idType},//传入新的校验规则
  {idCont:this.idCont})//传入校验的key和value进行校验
  .then(()=>{
 
  }).catch((errorCb)=>{
  errorCb.showError('idCont');
})；