密码已经是我们生活工作中必不可少的工具,但一个不安全的密码有又有可能会给我们造成不必要的损失。作为网站设计者,如果我们在网页中能对用户输入的密码进行安全评估,并显示出相应的提示信息,那么对用户设置一个安全的密码将有很大帮助。同时也使得网站更具人性化,更有吸引力.
什么是一个安全的密码呢?本程序按以下的方式进行评估.
1.如果密码少于5位,那么就认为这是一个弱密码.
2.如果密码只由数字、小写字母、大写字母或其它特殊符号当中的一种组成,则认为这是一个弱密码.
3.如果密码由数字、小写字母、大写字母或其它特殊符号当中的两种组成,则认为这是一个中度安全的密码.
4.如果密码由数字、小写字母、大写字母或其它特殊符号当中的三种以上组成,则认为这是一个比较安全的密码.
本程序将根据用户输入的密码分别显示不同的颜色表示密码的强度,具体程序如下:
以下是例子和引用片段:
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Code
1
<html>
2
<head>
3
<title>Javascript评估用户输入密码的强度</title>
4
<script language="JavaScript">
5
//CharMode函数
6
//测试某个字符是属于哪一类.
7![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
function CharMode(iN)
{
8
if (iN>=48 && iN <=57) //数字
9
return 1;
10
if (iN>=65 && iN <=90) //大写字母
11
return 2;
12
if (iN>=97 && iN <=122) //小写
13
return 4;
14
else
15
return 8; //特殊字符
16
}
17![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
18
//bitTotal函数
19
//计算出当前密码当中一共有多少种模式
20![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
function bitTotal(num)
{
21
modes=0;
22![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
for (i=0;i<4;i++)
{
23
if (num & 1) modes++;
24
num>>>=1;
25
}
26
return modes;
27
}
28![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
29
//checkStrong函数
30
//返回密码的强度级别
31![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
32![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
function checkStrong(sPW)
{
33
if (sPW.length<=4)
34
return 0; //密码太短
35
Modes=0;
36![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
for (i=0;i<sPW.length;i++)
{
37
//测试每一个字符的类别并统计一共有多少种模式.
38
Modes|=CharMode(sPW.charCodeAt(i));
39
}
40![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
41
return bitTotal(Modes);
42![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
43
}
44![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
45
//pwStrength函数
46
//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
47![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
48![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
function pwStrength(pwd)
{
49
O_color="#eeeeee";
50
L_color="#FF0000";
51
M_color="#FF9900";
52
H_color="#33CC00";
53![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
if (pwd==null||pwd=='')
{
54
Lcolor=Mcolor=Hcolor=O_color;
55
}
56![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
else
{
57
S_level=checkStrong(pwd);
58![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
switch(S_level)
{
59
case 0:
60
Lcolor=Mcolor=Hcolor=O_color;
61
case 1:
62
Lcolor=L_color;
63
Mcolor=Hcolor=O_color;
64
break;
65
case 2:
66
Lcolor=Mcolor=M_color;
67
Hcolor=O_color;
68
break;
69
default:
70
Lcolor=Mcolor=Hcolor=H_color;
71
}
72
}
73![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
74
document.getElementById("strength_L").style.background=Lcolor;
75
document.getElementById("strength_M").style.background=Mcolor;
76
document.getElementById("strength_H").style.background=Hcolor;
77
return;
78
}
79![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
80
</script>
81
</head>
82
<body>
83
<form name=form1 action="" >
84
输入密码:<input type=password size=10 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)>
85
<br>密码强度:
86
<table width="217" border="1" cellspacing="0" cellpadding="1" bordercolor="#cccccc" height="23" style='display:inline'>
87
<tr align="center" bgcolor="#eeeeee">
88![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
89
<td width="33%" id="strength_L">弱</td>
90![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
91
<td width="33%" id="strength_M">中</td>
92![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
93
<td width="33%" id="strength_H">强</td>
94
</tr>
95
</table>
96![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
97
</form>
98![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
99
</body>