js判断密码强度的方法

本文实例为大家分享了js判断密码强度的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html>

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>密码强度检测</title>
    <script type="text/javascript" src="js/jquery-2.2.4.min.js"></script>
    <style type="text/css">
      body {
        font: 12px/1.5 Arial;
      }

      input {
        float: left;
        font-size: 12px;
        width: 150px;
        font-family: arial;
        padding: 3px;
        border: 1px solid black;
      }

      input.error {
        border: 1px solid red;
      }

      #tips {
        float: left;
        margin: 2px 0 0 20px;
      }

      #tips span {
        float: left;
        width: 50px;
        height: 20px;
        color: white;
        background: green;
        margin-right: 2px;
        line-height: 20px;
        text-align: center;
      }
    </style>

    <script type="text/javascript">
      $(function() {
        var aStr = ["弱", "中", "强", "牛逼"];

        function checkStrong(val) {
          var modes = 0;
          if (val.length < 6) return 0;
          if (/\d/.test(val)) modes++; //数字
          if (/[a-z]/.test(val)) modes++; //小写
          if (/[A-Z]/.test(val)) modes++; //大写
          if (/\W/.test(val)) modes++; //特殊字符
          if (val.length > 12) return 4;
          return modes;
        };
        $(":text").keyup(function() {
          var val = $(this).val();
          $("p").text(val.length);
          var num = checkStrong(val);
          switch (num) {
            case 0:
              break;
            case 1:
              $("#tips span").css('background', 'yellow').text('').eq(num - 1).css('background', 'red').text(aStr[num - 1]);
              break;
            case 2:
              $("#tips span").css('background', 'green').text('').eq(num - 1).css('background', 'red').text(aStr[num - 1]);
              break;
            case 3:
              $("#tips span").css('background', 'green').text('').eq(num - 1).css('background', 'red').text(aStr[num - 1]);
              break;
            case 4:
              $("#tips span").css('background', 'green').text('').eq(num - 1).css('background', 'red').text(aStr[num - 1]);
              break;
            default:
              break;
          }
        })
      })
    </script>
  </head>

  <body>
    <input type="text" value="" maxlength="16" />
    <div id="tips"><span></span><span></span><span></span><span></span></div>
    <p></p>
  </body>

</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。