JavaScript密码强度检测源代码

1.Body代码部分
<body>
<h4>密码强度检测</h4>
<table width="100%" border="0" cellspacing="1" cellpadding="0">
<tr>
    <td width="100" align="right">强度显示：</td>
    <td>
<script language="javascript">
  var ps = new PasswordStrength();
  ps.setSize("200","20");
  ps.setMinLength(5);
</script>
</td>
</tr>
<tr>
    <td align="right">密码检测：</td>
    <td><input name="pwd" type="password" ];

this.divName = "pwd_div_"+Math.ceil(Math.random()*100000);
this.minLen = 5;

this.width = "150px";
this.height = "16px";

this.content = "";

this.selectedIndex = 0;

this.init();
}
PasswordStrength.prototype.init = function(){
var s = '<table cellpadding="0" ){
  return ;
}
n.innerHTML = this.content;
this.copyToStyle(this.selectedIndex);
}
PasswordStrength.prototype.update = function(s){
if(s.length < this.minLen){
  this.copyToStyle(0);
  return;
}
var ls = -1;
if (s.match(/[a-z]/ig)){
  ls++;
}
if (s.match(/[0-9]/ig)){
  ls++;
}
  if (s.match(/(.[^a-z0-9])/ig)){
  ls++;
}
if (s.length < 6 && ls > 0){
  ls--;
}
switch(ls) {
   case 0:
    this.copyToStyle(1);
    break;
   case 1:
    this.copyToStyle(2);
    break;
   case 2:
    this.copyToStyle(3);
    break;
   default:
    this.copyToStyle(0);
}
}