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<html xmlns="HTTP://www.w3.org/1999/xhtml">
<head>
<meta HTTP-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>簡單的JS實現檢測使用者密碼安全度</title>
<script language=javascript>
// CharMode函數
//測試某個字元是屬於哪一類
function CharMode(iN){
if (iN>=48 && iN <=57) //數位
return 1;
i f (iN>=65 && iN <=90) //大寫字母
return 2;
if (iN>=97 && iN <=122) //小寫
return 4;
else
return 8; //特殊字元
}
//bitTotal函數
//計算出當前密碼當中一共有多少種模式
function bitTotal(num){
modes=0;
fo r (i=0;i<4;i++){
if (num & 1) modes++;
num>>>=1;
}
return modes;
}
//checkStrong函數
//返回密碼的強度級別
function checkStrong(sPW){
if (sPW.length<=4)
return 0; //密碼太短
Modes=0;
for (i=0;i<sPW.length;i++){
//測試每一個字元的類別並統計一共有多少種模式
Modes|=CharMode(sPW.charCodeAt(i));
}
return bitTotal(Modes);
}
//pwStrength函數
//當使用者放開鍵盤或密碼輸入框失去焦點時,根據不同的級別顯示不同的顏色
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>
</head>
<body>
<form name="form1" action="">
輸入密碼:<input type="password" onKeyUp="pwStrength(this.value)" onBlur=" pwStrength(this.value)"><br>
密碼強度:<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc"
height="25" 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">強</td>
</tr>
</table>
</form>
<p style="margin-top:50px;" >查找更多代碼,請訪問:<a href="HTTP://www.jzread.com" target="_blank">網頁製作教程</a></p>
</body>
</html>