密码强度有4个状态，分别如下图。
无密码状态
密码低级状态
密码中级状态
密码高级状态
实现的代码主要如下：
HTML代码
<input type="PassWord" onKeyUp="CheckIntensity(this.value)"> <table cellpadding="0" cellspacing="0"> <tr> <td> </td> <td>无</td> <td> </td> </tr> </table>
CSS代码
.pwd{width:50px;height:20px;line-height:14px;padding-top:2px;} .pwd_f{color:#BBBBBB;} .pwd_c{background-color:#F3F3F3;border-top:1px solid #D0D0D0;border-bottom:1px solid #D0D0D0;border-left:1px solid #D0D0D0;} .pwd_Weak_c{background-color:#FF4545;border-top:1px solid #BB2B2B;border-bottom:1px solid #BB2B2B;border-left:1px solid #BB2B2B;} .pwd_Medium_c{background-color:#FFD35E;border-top:1px solid #E9AE10;border-bottom:1px solid #E9AE10;border-left:1px solid #E9AE10;} .pwd_Strong_c{background-color:#3ABB1C;border-top:1px solid #267A12;border-bottom:1px solid #267A12;border-left:1px solid #267A12;} .pwd_c_r{border-right:1px solid #D0D0D0;} .pwd_Weak_c_r{border-right:1px solid #BB2B2B;} .pwd_Medium_c_r{border-right:1px solid #E9AE10;} .pwd_Strong_c_r{border-right:1px solid #267A12;}
JS代码
function CheckIntensity(pwd) { var Mcolor, Wcolor, Scolor, Color_Html; var m = 0; //匹配数字 if (/\d+/.test(pwd)) { debugger; m++; }; //匹配字母 if (/[A-Za-z]+/.test(pwd)) { m++; }; //匹配除数字字母外的特殊符号 if (/[^0-9a-zA-Z]+/.test(pwd)) { m++; }; if (pwd.length <= 6) { m = 1; } if (pwd.length <= 0) { m = 0; } switch (m) { case 1: Wcolor = "pwd pwd_Weak_c"; Mcolor = "pwd pwd_c"; Scolor = "pwd pwd_c pwd_c_r"; Color_Html = "弱"; break; case 2: Wcolor = "pwd pwd_Medium_c"; Mcolor = "pwd pwd_Medium_c"; Scolor = "pwd pwd_c pwd_c_r"; Color_Html = "中"; break; case 3: Wcolor = "pwd pwd_Strong_c"; Mcolor = "pwd pwd_Strong_c"; Scolor = "pwd pwd_Strong_c pwd_Strong_c_r"; Color_Html = "强"; break; default: Wcolor = "pwd pwd_c"; Mcolor = "pwd pwd_c pwd_f"; Scolor = "pwd pwd_c pwd_c_r"; Color_Html = "无"; break; } document.getElementById('pwd_Weak').className = Wcolor; document.getElementById('pwd_Medium').className = Mcolor; document.getElementById('pwd_Strong').className = Scolor; document.getElementById('pwd_Medium').innerHTML = Color_Html; }