1
<script language=javascript>
2
3//CharMode函数
4//测试某个字符是属于哪一类.
5
function CharMode(iN){
6
if (iN>=48 && iN <=57) //数字
7return 1;
8if (iN>=65 && iN <=90) //大写字母
9return 2;
10if (iN>=97 && iN <=122) //小写
11return 4;
12else
13return 8; //特殊字符
14
}
15
16//bitTotal函数
17//计算出当前密码当中一共有多少种模式
18function bitTotal(num){
19modes=0;
20
for (i=0;i<4;i++){
21if (num & 1) modes++;
22num>>>=1;
23
}
24return modes;
25}
26
27//checkStrong函数
28//返回密码的强度级别
29
30function checkStrong(sPW){
31if (sPW.length<=4)
32return 0; //密码太短
33Modes=0;
34for (i=0;i<sPW.length;i++){
35//测试每一个字符的类别并统计一共有多少种模式.
36Modes|=CharMode(sPW.charCodeAt(i));
37}
38
39return bitTotal(Modes);
40
41}
42
43//pwStrength函数
44//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
45
46function pwStrength(pwd){
47O_color="#eeeeee";
48L_color="#FF0000";
49M_color="#FF9900";
50H_color="#33CC00";
51if (pwd==null||pwd==''){
52Lcolor=Mcolor=Hcolor=O_color;
53}
54else{
55S_level=checkStrong(pwd);
56switch(S_level) {
57case 0:
58Lcolor=Mcolor=Hcolor=O_color;
59case 1:
60Lcolor=L_color;
61Mcolor=Hcolor=O_color;
62break;
63case 2:
64Lcolor=Mcolor=M_color;
65Hcolor=O_color;
66break;
67default:
68Lcolor=Mcolor=Hcolor=H_color;
69}
70}
71
72document.getElementById("strength_L").style.background=Lcolor;
73document.getElementById("strength_M").style.background=Mcolor;
74document.getElementById("strength_H").style.background=Hcolor;
75return;
76}
77
78</script>
79
80<form name=form1 action="" >
81输入密码:<input type=password size=10 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)>
82<br>密码强度:
83<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23" style='display:inline'>
84<tr align="center" bgcolor="#eeeeee">
85
86<td width="33%" id="strength_L">弱</td>
87
88<td width="33%" id="strength_M">中</td>
89
90<td width="33%" id="strength_H">强</td>
91</tr>
92</table>
93</form>
94
<script language=javascript> 2
3
//CharMode函数 4
//测试某个字符是属于哪一类. 5
function CharMode(iN){ 
6
if (iN>=48 && iN <=57) //数字 7
return 1; 8
if (iN>=65 && iN <=90) //大写字母 9
return 2; 10
if (iN>=97 && iN <=122) //小写 11
return 4; 12
else 13
return 8; //特殊字符 14
} 15
16
//bitTotal函数 17
//计算出当前密码当中一共有多少种模式 18
function bitTotal(num){ 19
modes=0; 20
for (i=0;i<4;i++){ 
21
if (num & 1) modes++; 22
num>>>=1; 23
} 24
return modes; 25
} 26
27
//checkStrong函数 28
//返回密码的强度级别 29
30
function checkStrong(sPW){ 31
if (sPW.length<=4) 32
return 0; //密码太短 33
Modes=0; 34
for (i=0;i<sPW.length;i++){ 35
//测试每一个字符的类别并统计一共有多少种模式. 36
Modes|=CharMode(sPW.charCodeAt(i)); 37
} 38
39
return bitTotal(Modes); 40
41
} 42
43
//pwStrength函数 44
//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 45
46
function pwStrength(pwd){ 47
O_color="#eeeeee"; 48
L_color="#FF0000"; 49
M_color="#FF9900"; 50
H_color="#33CC00"; 51
if (pwd==null||pwd==''){ 52
Lcolor=Mcolor=Hcolor=O_color; 53
} 54
else{ 55
S_level=checkStrong(pwd); 56
switch(S_level) { 57
case 0: 58
Lcolor=Mcolor=Hcolor=O_color; 59
case 1: 60
Lcolor=L_color; 61
Mcolor=Hcolor=O_color; 62
break; 63
case 2: 64
Lcolor=Mcolor=M_color; 65
Hcolor=O_color; 66
break; 67
default: 68
Lcolor=Mcolor=Hcolor=H_color; 69
} 70
} 71
72
document.getElementById("strength_L").style.background=Lcolor; 73
document.getElementById("strength_M").style.background=Mcolor; 74
document.getElementById("strength_H").style.background=Hcolor; 75
return; 76
} 77
78
</script> 79
80
<form name=form1 action="" > 81
输入密码:<input type=password size=10 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)> 82
<br>密码强度: 83
<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23" style='display:inline'> 84
<tr align="center" bgcolor="#eeeeee"> 85
86
<td width="33%" id="strength_L">弱</td> 87
88
<td width="33%" id="strength_M">中</td> 89
90
<td width="33%" id="strength_H">强</td> 91
</tr> 92
</table> 93
</form> 94
