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js password strength check

高洛峰Original: 2017-01-16 09:23:261243browse

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>
<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"/>
 <div>
 <em>密码强度：</em>
 <div id="passStrength"></div>
 </div>
</body>
</html>
<script type="text/javascript" src="js/passwordStrength.js"></script>
<script type="text/javascript">
new PasswordStrength(&#39;pass&#39;,&#39;passStrength&#39;);
</script>

js code is as follows:

Copy code

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 div = document.createElement(&#39;div&#39;);
 var strong = document.createElement(&#39;strong&#39;);
 this.oStrength = id.appendChild(div);
 this.oStrengthTxt = id.parentNode.appendChild(strong);
};
PasswordStrength.prototype.checkStrength = function (val){
 var aLvTxt = [&#39;&#39;,&#39;低&#39;,&#39;中&#39;,&#39;高&#39;];
 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 = &#39;strengthLv&#39; + lv;
 this.oStrengthTxt.innerHTML = aLvTxt[lv];
};

Instructions for use:

1. One parameter 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).

The above is the entire content of this article. I hope it will be helpful to everyone's learning, and I also hope that everyone will subscribe to the PHP Chinese website.

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