本节代码，用于判断密码的强度， 效果示例： 代码： html head titleJS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;i4;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;isPW.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= table width=250 border=0 cellpadding=2 bordercolor=#eeeeee tr td width=40% align=right密码:/td td colspan=3 align=left input type=password size=20 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value) /td /tr tr align=center td width=40% align=right密码强度:/td td width=20% id=strength_L bgcolor=#f5f5f5弱/td td width=20% id=strength_M bgcolor=#f5f5f5中/td td width=20% id=strength_H bgcolor=#f5f5f5强/td /tr /table /form /body /html ，。