"This is the first day of my participation in the November Update Challenge. For details of the event, please check: 2021 Last Update Challenge "
form validation
The verification done here is only local legalization verification, not related to the back-end ( if the user input is wrong, the front-end page will prompt to change and prevent data from being sent to the back-end ). Therefore, the front-end form validation is only used to prompt the user.
onblur event occurs when focus is lost
Mainly use regular expressions
In form validation, it is a very frequent operation to use regular expressions to verify whether they are correct or not. This article collects 15 commonly used javaScript regular expressions, including username, password strength, integer, number, email address ( Email), mobile phone number, ID number, URL address, IPv4 address, hexadecimal color, date, QQ number, WeChat ID, license plate number, Chinese regular.
1 Regular username
//用户名正则，4到16位（字母，数字，下划线，减号）
var uPattern = /^[a-zA-Z0-9_-]{4,16}$/;
//输出 true
console.log(uPattern.test("caibaojian"));
复制代码2 password strength regular
//密码强度正则，最少6位，包括至少1个大写字母，1个小写字母，1个数字，1个特殊字符
var pPattern = /^.*(?=.{6,})(?=.*d)(?=.*[A-Z])(?=.*[a-z])(?=.*[!@#$%^&*? ]).*$/;
//输出 true
console.log("=="+pPattern.test("caibaojian#"));
复制代码3 Integer Regularization
//正整数正则
var posPattern = /^d+$/;
//负整数正则
var negPattern = /^-d+$/;
//整数正则
var intPattern = /^-?d+$/;
//输出 true
console.log(posPattern.test("42"));
//输出 true
console.log(negPattern.test("-42"));
//输出 true
console.log(intPattern.test("-42"));
复制代码4 Number Regular
Can be an integer or a floating point number
//正数正则
var posPattern = /^d*.?d+$/;
//负数正则
var negPattern = /^-d*.?d+$/;
//数字正则
var numPattern = /^-?d*.?d+$/;
console.log(posPattern.test("42.2"));
console.log(negPattern.test("-42.2"));
console.log(numPattern.test("-42.2"));
复制代码5 Email Regular
//Email正则
var ePattern = /^([A-Za-z0-9_-.])+@([A-Za-z0-9_-.])+.([A-Za-z]{2,4})$/;
//输出 true
console.log(ePattern.test("[email protected]"));
复制代码6 Regular phone number
//手机号正则
var mPattern = /^1[34578]d{9}$/; //http://caibaojian.com/regexp-example.html
//输出 true
console.log(mPattern.test("15507621888"));
复制代码7 Regular ID number
//身份证号（18位）正则
var cP = /^[1-9]d{5}(18|19|([23]d))d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)d{3}[0-9Xx]$/;
//输出 true
console.log(cP.test("11010519880605371X"));
复制代码8 URL Regularization
//URL正则
var urlP= /^((https?|ftp|file)://)?([da-z.-]+).([a-z.]{2,6})([/w .-]*)*/?$/;
//输出 true
console.log(urlP.test("http://caibaojian.com"));
复制代码9 IPv4 address regularization
//ipv4地址正则
var ipP = /^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
//输出 true
console.log(ipP.test("115.28.47.26"));
复制代码10 hex color regex
//RGB Hex颜色正则
var cPattern = /^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/;
//输出 true
console.log(cPattern.test("#b8b8b8"));
复制代码11 Date Regular
//日期正则，简单判定,未做月份及日期的判定
var dP1 = /^d{4}(-)d{1,2}1d{1,2}$/;
//输出 true
console.log(dP1.test("2017-05-11"));
//输出 true
console.log(dP1.test("2017-15-11"));
//日期正则，复杂判定
var dP2 = /^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$/;
//输出 true
console.log(dP2.test("2021-02-11"));
//输出 false
console.log(dP2.test("2021-15-11"));
//输出 false
console.log(dP2.test("2021-02-29"));
复制代码12 Regular QQ numbers
//QQ号正则，5至11位
var qqPattern = /^[1-9][0-9]{4,10}$/;
//输出 true
console.log(qqPattern.test("65974040"));
复制代码13 WeChat regular
//微信号正则，6至20位，以字母开头，字母，数字，减号，下划线
var wxPattern = /^[a-zA-Z]([-_a-zA-Z0-9]{5,19})+$/;
//输出 true
console.log(wxPattern.test("caibaojian_com"));
复制代码14 Regular license plate number
//车牌号正则
var cPattern = /^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领A-Z]{1}[A-Z]{1}[A-Z0-9]{4}[A-Z0-9挂学警港澳]{1}$/;
//输出 true
console.log(cPattern.test("晋A66666"));
复制代码15 Contains Chinese regular expressions
//包含中文正则
var cnPattern = /[u4E00-u9FA5]/;
//输出 true
console.log(cnPattern.test("中文"));
复制代码