一百行js代码实现一个验证工具

export default class Coi {
    constructor(prop) {
        this.input = prop
        this.errorMessage = '通过校验' // 错误信息
        this.pass = true // 校验是否通过
    }

    // 数据输入
    data(input) {
        if (!this.pass) return this

        this.input = input
        return this
    }

    // 必填，不能为空
    isRequired(message) {
        if (!this.pass) return this

        if (
            /^s*$/g.test(this.input) ||
            this.input === null ||
            this.input === undefined
        ) {
            this.errorMessage = message
            this.pass = false
        }
        return this
    }

    // 最小长度
    minLength(length, message) {
        if (!this.pass) return this

        if (this.input.length < length) {
            this.errorMessage = message
            this.pass = false
        }
        return this
    }

    // 最大长度
    maxLength(length, message) {
        if (!this.pass) return this

        if (this.input.length > length) {
            this.errorMessage = message
            this.pass = false
        }
        return this
    }

    // 需要的格式 number: 数字, letter: 字母, chinese: 中文
    requireFormat(formatArray, message) {
        if (!this.pass) return this
        let formatMap = {
            number: 0,
            letter: 0,
            chinese: 0
        }

        Object.keys(formatMap).forEach(key => {
            if (formatArray.includes(key)) formatMap[key] = 1
        })

        let formatReg = new RegExp(
            `^[${formatMap.number ? '0-9' : ''}${
                formatMap.letter ? 'a-zA-Z' : ''
            }${formatMap.chinese ? 'u4e00-u9fa5' : ''}]*$`
        )

        if (!formatReg.test(this.input)) {
            this.errorMessage = message
            this.pass = false
        }
        return this
    }

    // 邮箱校验
    isEmail(message) {
        if (!this.pass) return this

        const emailReg = /^[a-z0-9]+([._\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$/if(!emailReg.test(this.input)){this.errorMessage = message
            this.pass=false}returnthis}// ulr校验
    isURL(message){if(!this.pass)returnthisconst urlReg =newRegExp('^(?!mailto:)(?:(?:http|https|ftp)://|//)(?:\S+(?::\S*)?@)?(?:(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[0-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))|localhost)(?::\d{2,5})?(?:(/|\?|#)[^\s]*)?$','i')if(!urlReg.test(this.input)){this.errorMessage = message
            this.pass=false}returnthis}// 自定义正则校验
    requireRegexp(reg, message){if(!this.pass)returnthisif(!reg.test(this.input)){this.errorMessage = message
            this.pass=false}returnthis}}

使用姿势如下：

import Coi from 'js-coi'

const validCoi = new Coi()
validCoi
    .data('1234')
    .isRequired('id不能为空')
    .minLength(3, 'id不能少于3位')
    .maxLength(5, 'id不能多于5位')

    .data('1234@qq.')
    .isRequired('邮箱不能为空')
    .isEmail('邮箱格式不正确')

    .data('http:dwd')
    .isRequired('url不能为空')
    .isUrl('url格式不正确')

if (!validCoi.pass) {
    this.$message.error(validCoi.errorMessage)
    return
}

当然你只校验一个字段的话也可以这么使用：

import Coi from 'js-coi'

const idCoi = new Coi('1234')
idCoi
    .isRequired('id不能为空')
    .minLength(3, 'id不能少于3位')
    .maxLength(5, 'id不能多于5位')
    .isEmail('id邮箱格式不正确')
    .isUrl('id格式不正确')
    .requireFormat(['number', 'letter', 'chinese'], 'id格式不正确')
    .requireRegexp(/012345/, 'id格式不正确')

if (!idCoi.pass) {
    this.$message.error(idCoi.errorMessage)
    return
}