来自Google的密码强度Javascript验证代码

来源：Linuxdby.com 作者：Webmaster 时间：2007-06-05 点击： [收藏] [投稿]

1 <script type="text/javascript">
2 var agt = navigator.userAgent.toLowerCase();
3 var is_op = (agt.indexOf("opera") != -1);
4 var is_ie = (agt.indexOf("msie") != -1) && document.all && !is_op;
5 var is_ie5 = (agt.indexOf("msie 5") != -1) && document.all && !is_op;
6
7 function CreateXmlHttpReq(handler) {
8   var xmlhttp = null;
9   if (is_ie) {
10     var control = (is_ie5) ? "Microsoft.XMLHTTP" : "Msxml2.XMLHTTP";
11     try {
12       xmlhttp = new ActiveXObject(control);
13       xmlhttp.onreadystatechange = handler;
14     } catch (ex) {
15       alert("You need to enable active scripting and activeX controls");
16     }
17
18   } else {
19     xmlhttp = new XMLHttpRequest();
20     xmlhttp.onload = handler;
21     xmlhttp.onerror = handler;
22   }
23   return xmlhttp;
24 }
25
26
27 function XmlHttpPOST(xmlhttp, url, data) {
28   try {
29     xmlhttp.open("POST", url, true);
30     xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
31     xmlhttp.send(data);
32
33   } catch (ex) {
34     // do nothing
35   }
36 }
37
38
39 var myxmlhttp;
40 ratingMsgs = new Array(6);
41 ratingMsgColors = new Array(6);
42 barColors = new Array(6);
43
44 ratingMsgs[0] = "太短";
45 ratingMsgs[1] = "弱";
46 ratingMsgs[2] = "一般";
47 ratingMsgs[3] = "很好";
48 ratingMsgs[4] = "极佳";
49 ratingMsgs[5] = "未评级";
50
51 ratingMsgColors[0] = "#676767";
52 ratingMsgColors[1] = "#aa0033";
53 ratingMsgColors[2] = "#f5ac00";
54 ratingMsgColors[3] = "#6699cc";
55 ratingMsgColors[4] = "#008000";
56 ratingMsgColors[5] = "#676767";
57
58 barColors[0] = "#dddddd";
59 barColors[1] = "#aa0033";
60 barColors[2] = "#ffcc33";
61 barColors[3] = "#6699cc";
62 barColors[4] = "#008000";
63 barColors[5] = "#676767";
64
65 function CreateRatePasswdReq ()
66 {
67 var passwd = getElement('Passwd').value;
68 var email = getElement('Email').value;
69 var lastname = getElement('LastName').value;
70 var firstname = getElement('FirstName').value;
71 var min_passwd_len = 6;
72
73
74 if (passwd.length < min_passwd_len)
75 {
76   if (passwd.length > 0)
77   {
78     DrawBar(0);
79   }
80   else
81   {
82     ResetBar();
83   }
84 }
85 else
86 {
87     passwd = escape(passwd);
88     var params = 'Passwd='+passwd+'&Email='+email+'&FirstName='+firstname+'&LastName='+lastname;
89     myxmlhttp = CreateXmlHttpReq(RatePasswdXmlHttpHandler);
90     XmlHttpPOST(myxmlhttp, "https://www.google.com/accounts/RatePassword", params);
91 }
92 }
93
94 function getElement(name)
95 {
96   if (document.all)
97   {
98       return document.all(name);
99   }
100   return document.getElementById(name);
101 }
102
103 function RatePasswdXmlHttpHandler()
104 { // Can't check status since safari doesn't support it
105   if (myxmlhttp.readyState != 4)
106   {
107   return;
108   }
109   rating = parseInt(myxmlhttp.responseText);
110   DrawBar(rating);
111 }
112
113 function DrawBar(rating)
114 {
115 var posbar = getElement('posBar');
116 var negbar = getElement('negBar');
117 var passwdRating = getElement('passwdRating');
118 var barLength = getElement('passwdBar').width;
119
120 if (rating >= 0 && rating <= 4)
121 {       //We successfully got a rating
122     posbar.style.width = barLength / 4 * rating + "px";

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