JavaScript动态检测密码强度原理及实现方法详解

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>www.jb51.net 密码强度检测</title>
  </head>
  <style type="text/css">
    .default {background: #eeeeee;}
    .weak {background: #FF0000;}
    .medium {background: #FF9900;}
    .strong {background: #33CC00;}
    input {height: 20px; line-height: 20px;width: 210px;}
    span {display: inline-block;width: 70px;height: 30px;line-height: 30px;background: #ddd;text-align: center;margin: 4px 2px;}
  </style>
  <script type="text/javascript">
    window.onload = function(){
      var oInput = document.getElementById('pwd');
      oInput.value = '';
      var spans = document.getElementsByTagName('span');
      oInput.onkeyup = function(){
        //强度状态设为默认
        spans[0].className = spans[1].className = spans[2].className = "default";
        var pwd = this.value;
        var result = 0;
        for(var i = 0, len = pwd.length; i < len; ++i){
          result |= charType(pwd.charCodeAt(i));
        }
        var level = 0;
        //对result进行四次循环，计算其level
        for(var i = 0; i <= 4; i++){
          if(result & 1){
            level ++;
          }
          //右移一位
          result = result >>> 1;
        }
        if(pwd.length >= 6){
          switch (level) {
            case 1:
              spans[0].className = "weak";
              break;
            case 2:
              spans[0].className = "medium";
              spans[1].className = "medium";
              break;
            case 3:
            case 4:
              spans[0].className = "strong";
              spans[1].className = "strong";
              spans[2].className = "strong";
              break;
          }
        }
      }
    }
    /*
      定义一个函数，对给定的数分为四类(判断密码类型)，返回十进制1，2，4，8
      数字 0001 -->1 48~57
      小写字母 0010 -->2 97~122
      大写字母 0100 -->4 65~90
      特殊 1000 --> 8 其它
    */
    function charType(num){
      if(num >= 48 && num <= 57){
        return 1;
      }
      if (num >= 97 && num <= 122) {
        return 2;
      }
      if (num >= 65 && num <= 90) {
        return 4;
      }
      return 8;
    }
  </script>
  <body>
    <label for="">请输入密码：</label><input id ='pwd' type="text" name="pwd" /><br>
    <label for="">密 码 强 度：</label><span>弱</span><span>中</span><span>强</span>
  </body>
</html>