本文主要和大家介绍js基于正则表达式实现的密码强度验证功能,涉及javascript事件响应及基于正则的字符遍历、判断等相关操作技巧,需要的朋友可以参考下，希望能帮助到大家。
具体代码如下：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>www.jb51.net 脚本之家</title>
</head>
<style type="text/css">
body {
background: #ccc;
}
label {
width: 40px;
display: inline-block;
}
span {
color: red;
}
.container {
margin: 100px auto;
width: 400px;
padding: 50px;
line-height: 40px;
border: 1px solid #999;
background: #efefef;
}
span {
margin-left: 30px;
font-size: 12px;
}
.wrong {
color: red
}
.right {
color: green;
}
.strengthlv0 {
height: 6px;
width: 120px;
border: 1px solid #ccc;
padding: 2px;
}
.strengthlv1 {
background: red;
height: 6px;
width: 40px;
border: 1px solid #ccc;
padding: 2px;
}
.strengthlv2 {
background: orange;
height: 6px;
width: 80px;
border: 1px solid #ccc;
padding: 2px;
}
.strengthlv3 {
background: green;
height: 6px;
width: 120px;
border: 1px solid #ccc;
padding: 2px;
}
</style>
<body>
<p class="container">
<label>密码</label>
<input type="text" id="inp1" maxlength="16">
<!--<input type="password" id="inp1" maxlength="16"/>-->
<p class="pass-wrap">
<em>密码强度：</em>
<em id="strength"></em>
<p id="strengthlevel" class="strengthlv0"></p>
</p>
</p>
<script>
var regex = /^[1-9]\d{4,9}$/; //匹配qq号
//找人
var inp1 = document.getelementbyid("inp1");
var strength = document.getelementbyid("strength");
var strengthlevel = document.getelementbyid("strengthlevel");
var arr = ["", "低", "中", "高"];
inp1.onkeyup = function () {
var level = 0;
if (/[1-9]/.test(this.value)) {
level++;
}
if (/[a-z]/.test(this.value)) {
level++;
}
if (/[^a-z1-9]/.test(this.value)) {
level++
}
if (this.value.length < 6) {
level = 0;
}
strength.innerhtml = arr[level];
strengthlevel.classname = "strengthlv" + level;
};
/* inp1.onkeyup = function () {
var level = 0;
if (/[1-9]/.test(this.value)) {
level++;
}
if (/[a-z]/.test(this.value)) {
level++
}
if (/[^a-z0-9]/.test(this.value)) {
level++
}
if (inp1.value.length < 6) {
level = 0;
}
strengthlevel.classname = "strengthlv"+level;
strength.innerhtml = arr[level];
};*/
</script>
</body>
</html>
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以上就是js正则实现密码强度验证功能的详细内容。