js检验密码强度(低中高)附图

网络编程 2024/11/15 佚名

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最近一直在做通行证项目，里面的注册模块中输入密码需要显示密码强度（低中高）。今天就把做的效果给大家分享下，代码没有网上搜索的那么复杂，能够满足一般的需求。

html 代码如下：
复制代码代码如下:
<!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"/>
<div class="pass-wrap">
<em>密码强度：</em>
<div id="passStrength"></div>
</div>
</body>
</html>
<script type="text/javascript" src="/UploadFiles/2021-04-02/passwordStrength.js"><script type="text/javascript">
new PasswordStrength('pass','passStrength');
</script>

js 代码如下：
复制代码代码如下:
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('div');
var strong = document.createElement('strong');
this.oStrength = id.appendChild(div);
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];
};

效果图：