JavaScript实现密码强度校验的两种常用方法

/*
 *密码安全程度 
 *return ：全部为字母或者数字,或者密码长度小于
 *return : 字母数字组成，或者字母特殊字符，或者数字和特殊字符
 *return : 字母和数字和特殊字符
 */
 String.prototype.passwordStrength=function(){
 if(this.length> && this.length<=) return ;
 var n = (this.search(/[a-zA-Z]/) != -) ? : ,
 n = (this.search(/[-]/) != -) ? : ,
 n =(this.search(/[\~\`\!\@\#\$\%\^\&\*\(\)\_\+\-\=\[\]|{\}\;\'\:\"\,\.\/\<\>\?]{,}/) != -) ? : ; 
 return n+n+n;
 }

 <!doctype html>
 <html>
 <head>
 <meta charset="utf-">
 <title>js密码强度</title>
 <style type="text/css">
 .pw_letter{ margin-top:px; font-size: px; }
 .pw_letter label{float: left; margin-right:px; cursor: default; font-size: px; line-height: px;;}
 .pw_letter span{ float: left; display:inline-block; width:px; height:px; line-height:px; text-align:center; color:#FFF; background-color:#ccc; border-left: px solid #FFF;}
 .pw_letter span.pw_strength_color{ background-color:green;}
 </style>
 </head>
 <body>
 <input id="password" type="password" name="password" placeholder="密码" onKeyUp="setPasswordStrength(this.value.trim())">
 <div class="pw_letter"><label>安全程度</label> <span class="strength">弱</span> <span class="strength">中</span> <span class="strength">强</span> </div>
 <script type="text/javascript">
 /*
 *密码安全程度 
 *return ：全部为字母或者数字,或者密码长度小于
 *return : 字母数字组成，或者字母特殊字符，或者数字和特殊字符
 *return : 字母和数字和特殊字符
 */
 String.prototype.passwordStrength=function(){
 if(this.length> && this.length<=) return ;
 var n = (this.search(/[a-zA-Z]/) != -) ? : ,
 n = (this.search(/[-]/) != -) ? : ,
 n =(this.search(/[\~\`\!\@\#\$\%\^\&\*\(\)\_\+\-\=\[\]|{\}\;\'\:\"\,\.\/\<\>\?]{,}/) != -) ? : ; 
 return n+n+n;
 }
 String.prototype.trim = String.prototype.trim || function(){
 return this.replace(/^\s+|\s+$/g,"");
 }
 function setPasswordStrength(pwd){
 var strength_span = document.getElementsByClassName("strength");
 for(var i=; i<strength_span.length; i++){
  strength_span.item(i).className="strength"; 
 }
 for(var i=; i<pwd.passwordStrength(); i++){
  document.getElementsByClassName("strength").item(i).className="strength pw_strength_color";
 } 
 }
 </script>
 </body>

<script>
function AuthPasswd(string) {
 if(string.length >=6) {
 if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string) && /\W+\D+/.test(string)) {
  noticeAssign(1);
 }else if(/[a-zA-Z]+/.test(string) || /[0-9]+/.test(string) || /\W+\D+/.test(string)) {
  if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string)) {
  noticeAssign(-1);
  }else if(/\[a-zA-Z]+/.test(string) && /\W+\D+/.test(string)) {
  noticeAssign(-1);
  }else if(/[0-9]+/.test(string) && /\W+\D+/.test(string)) {
  noticeAssign(-1);
  }else{
  noticeAssign(0);
  }
 }
 }else{
 noticeAssign(null); 
 }
}
function noticeAssign(num) {
 if(num == 1) {
 $('#weak').css({backgroundColor:'#009900'});
 $('#middle').css({backgroundColor:'#009900'});
 $('#strength').css({backgroundColor:'#009900'});
 $('#strength').html('很强');
 $('#middle').html('');
 $('#weak').html('');
 }else if(num == -1){
 $('#weak').css({backgroundColor:'#ffcc33'});
 $('#middle').css({backgroundColor:'#ffcc33'});
 $('#strength').css({backgroundColor:''});
 $('#weak').html('');
 $('#middle').html('中');
 $('#strength').html('');
 }else if(num ==0) {
 $('#weak').css({backgroundColor:'#dd0000'});
 $('#middle').css({backgroundColor:''});
 $('#strength').css({backgroundColor:''});
 $('#weak').html('弱');
 $('#middle').html('');
 $('#strength').html('');
 }else{
 $('#weak').html('&nbsp;');
 $('#middle').html('&nbsp;');
 $('#strength').html('&nbsp;');
 $('#weak').css({backgroundColor:''});
 $('#middle').css({backgroundColor:''});
 $('#strength').css({backgroundColor:''});
 }
}
</script>