jQuery实现注册会员时密码强度提示信息功能示例

<p><span>设置密码：</span><input type="password" id="external_regist_password1" name="password1" value="" /><b>*</b><span id="password1_bg" class="bg_rt" style="display:none"></span></p><p class="mima_qd" id="password1_strength" style="display:none"> <span class="mm_strength"><em>密码强度</em>   <i class="password_qd">    <span class="password_bg" id="strength_L"></span>    <span class="password_bg" id="strength_M"></span>    <span class="password_bg" id="strength_H"></span>   </i>  <em id="pw_check_info"></em></span></p><p class="tishi_wr" id="password1_info"></p>

//checkStrong函数//返回密码的强度级别function checkStrong(sPW){  if (sPW.length<=4)    return 0; //密码太短    var Modes=0;  for (i=0;i<sPW.length;i++){    //测试每一个字符的类别并统计一共有多少种模式.    //charCodeAt():返回unicode编码的值    Modes|=CharMode(sPW.charCodeAt(i)); //测试某个字符属于哪一类  }  return bitTotal(Modes);//计算出当前密码当中一共有多少种模式}//CharMode函数//测试某个字符是属于哪一类.function CharMode(iN){  if (iN>=48 && iN <=57) //数字    return 1;  if (iN>=65 && iN <=90) //大写字母    return 2;  if (iN>=97 && iN <=122) //小写    return 4;  else    return 8; //特殊字符}//bitTotal函数//计算出当前密码当中一共有多少种模式function bitTotal(num){  var modes=0;  for (i=0;i<4;i++){    if (num & 1) modes++;    num>>>=1;  }  return modes;}//pwStrength函数//当用户放开键盘或密码输入框失去焦点时,根据不同的级别显示不同的颜色function pwStrength(pwd){  var O_color="#eeeeee";  var L_color="#FF4040";  var M_color="#FF9900";  var H_color="#33CC00";  var info = "";  if (pwd==null||pwd==''){    Lcolor=Mcolor=Hcolor=O_color;  } else {    S_level=checkStrong(pwd);//检测密码的强度    switch(S_level) {       case 0:         Lcolor=L_color;         Mcolor=Hcolor=O_color;         info = "弱";         break;       case 1:         Lcolor=L_color;         Mcolor=Hcolor=O_color;         info = "弱";         break;       case 2:         Lcolor=Mcolor=M_color;         Hcolor=O_color;         info = "中";         break;       default:         Lcolor=Mcolor=Hcolor=H_color;         info = "强";       }     }   $("#strength_L").css("background", Lcolor);   $("#strength_M").css("background", Mcolor);   $("#strength_H").css("background", Hcolor);   $("#pw_check_info").html(info);//密码强度提示信息   return;}