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<html> <head> <title>JS判断密码强度</title> <script language=javascript> //判断输入密码的类型 function CharMode(iN) { if (iN >= 48 && iN <= 57) //数字 return 1; if (iN >= 65 && iN <= 90) //大写 return 2; if (iN >= 97 && iN <= 122) //小写 return 4; else return 8; } //bitTotal函数 //计算密码模式 function bitTotal(num) { modes = 0; for (i = 0; i < 4; i++) { if (num & 1) modes++; num >>>= 1; } return modes; } //返回强度级别 function checkStrong(sPW) { if (sPW.length <= 4) return 0; //密码太短 Modes = 0; for (i = 0; i < sPW.length; i++) { //密码模式 Modes |= CharMode(sPW.charCodeAt(i)); } return bitTotal(Modes); } //显示颜色 function pwStrength(pwd) { O_color = "#eeeeee"; L_color = "#FF0000"; M_color = "#FF9900"; H_color = "#33CC00"; if (pwd == null || pwd == ‘‘) { Lcolor = Mcolor = Hcolor = O_color; } else { S_level = checkStrong(pwd); switch (S_level) { case 0: Lcolor = Mcolor = Hcolor = O_color; case 1: Lcolor = L_color; Mcolor = Hcolor = O_color; break; case 2: Lcolor = Mcolor = M_color; Hcolor = O_color; break; default: Lcolor = Mcolor = Hcolor = H_color; } } document.getElementById("strength_L").style.background = Lcolor; document.getElementById("strength_M").style.background = Mcolor; document.getElementById("strength_H").style.background = Hcolor; return; } </script> </head> <body> <form name=form1 action="" > 密码:<input type=password size=8 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)> <br>密码强度: <table width="210" border="1" cellspacing="0" cellpadding="1" bordercolor="#eeeeee" height="22" style=‘display:inline‘> <tr align="center" bgcolor="#f5f5f5"> <td width="33%" id="strength_L">弱</td> <td width="33%" id="strength_M">中</td> <td width="33%" id="strength_H">强</td> </tr> </table> </form> </body> </html>
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原文地址：http://www.cnblogs.com/light-j/p/4554564.html
