Home >Web Front-end >JS Tutorial >JS password strength verification regular expression (with code)

JS password strength verification regular expression (with code)

php中世界最好的语言Original: 2018-03-29 18:00:132994browse

This time I will bring you JS password strength verificationRegular expression (with code), use JS password strength verification regular expressionWhat are the precautions, The following is a practical case, let’s take a look.

I have been working on a pass project recently. When entering a password in the registration module, the password strength (low, medium, high) needs to be displayed. Today I will share with you the results. The code is not as complicated as the online search and can meet general needs.

html code is as follows:

<!DOCTYPE HTML>
<html lang="en">
<head>
  <meta charset="utf-8"/>
  <title>密码强度</title>
  <style type="text/css">
  #passStrength{height:6px;width:120px;border:1px solid #ccc;padding:2px;}
  .strengthLv1{background:red;height:6px;width:40px;}
  .strengthLv2{background:orange;height:6px;width:80px;}
  .strengthLv3{background:green;height:6px;width:120px;}
  </style>
</head>
<body>
  <input type="password" name="pass" id="pass" maxlength="16"/>
  <p class="pass-wrap">
    <em>密码强度：</em>
    <p id="passStrength"></p>
  </p>
</body>
</html>
<script type="text/javascript" src="js/passwordStrength.js"></script>
<script type="text/javascript">
new PasswordStrength('pass','passStrength');
</script>

js code is as follows:

function PasswordStrength(passwordID,strengthID){
  this.init(strengthID);
  var _this = this;
  document.getElementById(passwordID).onkeyup = function(){
    _this.checkStrength(this.value);
  }
};
PasswordStrength.prototype.init = function(strengthID){
  var id = document.getElementById(strengthID);
  var p = document.createElement('p');
  var strong = document.createElement('strong');
  this.oStrength = id.appendChild(p);
  this.oStrengthTxt = id.parentNode.appendChild(strong);
};
PasswordStrength.prototype.checkStrength = function (val){
  var aLvTxt = ['','低','中','高'];
  var lv = 0;
  if(val.match(/[a-z]/g)){lv++;}
  if(val.match(/[0-9]/g)){lv++;}
  if(val.match(/(.[^a-z0-9])/g)){lv++;}
  if(val.length < 6){lv=0;}
  if(lv > 3){lv=3;}
  this.oStrength.className = 'strengthLv' + lv;
  this.oStrengthTxt.innerHTML = aLvTxt[lv];
};

Rendering:

##Instructions for use:

1. The first parameter of the object is the id of the password input box, and the second parameter is the id of the password strength bar.

2. The password strength rules can be customized in the checkStrength method.

3. Password strength displays low, medium and high corresponding to 3 css styles (strengthLv1, strengthLv2, strengthLv3).

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

JS password strength verification regular expression (with code)

Related articles