密码强度检测函数（正则）

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var width=0; 
var height=0; 
width=imgObj.width+20; //+20是因为IE方式的默认边距 
height=imgObj.height+20; 
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<script type="text/javascript"> 
//From BBS.51JS.COM By 网络东西 
var $ = function(v){return document.getElementById(v);} 
function isSecurity(v){ 
 if (v.length < 3) { iss.reset();return;} 
 var lv = -1; 
 if (v.match(/[a-z]/ig)){lv++;} 
 if (v.match(/[0-9]/ig)){lv++;} 
 if (v.match(/(.[^a-z0-9])/ig)){lv++;} 
 if (v.length < 6 && lv > 0){lv--;} 
 iss.reset(); 
 switch(lv) {  
 case 0: 
 iss.level0(); 
 break; 
 case 1: 
 iss.level1(); 
 break; 
 case 2: 
 iss.level2(); 
 break; 
 default: 
 iss.reset(); 
 } 
} 
var iss = { 
 color:["CC0000","FFCC33","66CC00","CCCCCC"], 
 text:["弱","中","强"], 
 width:["50","100","150","10"], 
 reset:function(){ 
 $("B").style.backgroundColor = iss.color[3]; 
 $("B").style.width = iss.width[3]; 
 $("A").innerHTML = ""; 
 }, 
 level0:function(){ 
 $("B").style.backgroundColor = iss.color[0]; 
 $("B").style.width = iss.width[0]; 
 $("A").innerHTML = "密码较弱";  
 }, 
 level1:function(){ 
 $("B").style.backgroundColor = iss.color[1]; 
 $("B").style.width = iss.width[1]; 
 $("A").innerHTML = "中";  
 }, 
 level2:function(){ 
 $("B").style.backgroundColor = iss.color[2]; 
 $("B").style.width = iss.width[2]; 
 $("A").innerHTML = "高强"; 
 } 
} 
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                      <td align="right"> <span class="font14"><font color="#FF3300">贝因美冠军宝贝大赛专用信息平台入口</font></span>  
                          <p align="center"><font color=#ff0000>用户名或密码错误，请重新输入。</font></p> 
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      <td width="25%" align=right>帐号/编号:</td> 
      <td width="25%"><input name=LoginName type=text size=10 maxlength=20 class="doc_txt" value=""></td> 
      <td align=right>密码: <input name="Pwd" type="Password" size=10 maxlength=20 class="doc_txt" value="" onkeyup="isSecurity(this.value);"></td> 
    </tr> 
    <tr>  
      <td height="50" colspan="3" align=right> 
        <table width="100%" border="0" cellspacing="0" cellpadding="0"> 
          <tr> 
            <td width="36%" align="right"><font class="red" id="A">密码强度检测</font> </td> 
            <td width="64%" valign="top"> 
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