validator

validator是個(gè)好用的字符串校驗(yàn)工具，比如是否是數(shù)組，是否是郵箱，是否是bool值，很簡(jiǎn)單就可以搞定。
具體直接參考上面鏈接就可以了。很簡(jiǎn)單的。

var validator = require('validator');
function fetchData(userEmailStr, userAgeStr, isManStr) {
    if (!validator.isEmail(userEmailStr)) {
      return 'userEmail is error';
    }
  
    if (!validator.isNumeric(userAgeStr)) {
      return 'userAgeStr is error';
    }
  
    if (!validator.isBoolean(isManStr)) {
      return 'isManStr is error';
    }
    // do something  
    return 'allFormatPassed';
  }

  var res = fetchData('username@qq.com', '18', 'true');
  console.log(res);// allFormatPassed 

joi

joi是對(duì)象綱要描述語(yǔ)言以及JavaScript對(duì)象校驗(yàn)工具

還可以自定義約束條件

const Joi = require('joi');

const schema = Joi.object().keys({
    userEmailStr:Joi.string().email(),
    userAgeStr:Joi.number(),
    isManStr:Joi.bool()
});

function fetchData(obj) {
    // 這里定義變量時(shí)使用了對(duì)象的解構(gòu) 變量名不能亂寫(xiě)
    var {error,value} = Joi.validate(obj, schema);

    if (error) {
        return error.message;
    }
    // do something
    return value;
}

var obj = { userEmailStr: '@qq.com', userAgeStr: 18, isManStr:'true' };
console.log(fetchData(obj));//child "userEmailStr" fails because ["userEmailStr" must be a valid email]