用户输入密码的强度_javascript技巧

<P><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE> New Document </TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""></HEAD></P><P><script language=javascript></P><P>//程序设计:环球万维,专业提供虚拟主机,域名注册服务//网址:<a href="http://www.netInter.cn" target="_blank">http://www.netInter.cn</a>//本程序是环球万维原创程序,若需转载,请注明网址及出处,谢谢.//以上信息与文章正文是不可分割的一部分,所以如果您要转载本文章,您必须保留以上信息.</P><P>//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;elsereturn 8; //特殊字符}</P><P>//bitTotal函数//计算出当前密码当中一共有多少种模式function bitTotal(num){modes=0;for (i=0;i<4;i++){if (num & 1) modes++;num>>>=1;}return modes;}</P><P>//checkStrong函数//返回密码的强度级别</P><P>function checkStrong(sPW){if (sPW.length<=4)return 0; //密码太短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.Modes|=CharMode(sPW.charCodeAt(i));}</P><P>return bitTotal(Modes);</P><P>} </P><P>//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</P><P>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;  }} </P><P>document.getElementById("strength_L").style.background=Lcolor;document.getElementById("strength_M").style.background=Mcolor;document.getElementById("strength_H").style.background=Hcolor;return;}</P><P></script></P><P><BODY><form name=form1 action="" >输入密码:<input type=password size=10 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)>密码强度:<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23" style='display:inline'>  <tr align="center" bgcolor="#eeeeee">     <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></P><P></form></P><P></BODY></HTML></P><P> </P>

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用户输入密码的强度_javascript技巧_