查看效果:js自動(dòng)評(píng)密碼的強(qiáng)度
〈script language=javascript>
//CharMode函數(shù)
//測(cè)試某個(gè)字符是屬于哪一類.
function CharMode(iN){
if (iN>=48 && iN 〈=57) //數(shù)字
return 1;
if (iN>=65 && iN 〈=90) //大寫字母
return 2;
if (iN>=97 && iN 〈=122) //小寫
return 4;
else
return 8; //特殊字符
}
//bitTotal函數(shù)
//計(jì)算出當(dāng)前密碼當(dāng)中一共有多少種模式
function bitTotal(num){
modes=0;
for (i=0;i〈4;i++){
if (num & 1) modes++;
num>>>=1;
}
return modes;
}
//checkStrong函數(shù)
//返回密碼的強(qiáng)度級(jí)別
function checkStrong(sPW){
if (sPW.length〈=4)
return 0; //密碼太短
Modes=0;
for (i=0;i〈sPW.length;i++){
//測(cè)試每一個(gè)字符的類別并統(tǒng)計(jì)一共有多少種模式.
Modes|=CharMode(sPW.charCodeAt(i));
}
return bitTotal(Modes);
}
//pwStrength函數(shù)
//當(dāng)用戶放開鍵盤或密碼輸入框失去焦點(diǎn)時(shí),根據(jù)不同的級(jí)別顯示不同的顏色
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>
〈form name=form1 action="" >
輸入密碼:
〈input type=password size=10 onKeyUp=pwStrength(this.value)
onBlur=pwStrength(this.value)>
〈br>密碼強(qiáng)度:
〈table width="217" cellspacing="0" cellpadding="1" bordercolor="#cccccc"
height="23" style='display:inline'>
〈tr bgcolor="#eeeeee">
〈td width="33%" id="strength_L">弱〈/td>
〈td width="33%" id="strength_M">中〈/td>
〈td width="33%" id="strength_H">強(qiáng)〈/td>
〈/tr>
〈/table>
〈/form>