密码强度验证javascript，来自Ext.ux.PasswordMeter

强度计算函数：

 

01/**
02   * Calculates the strength of a password
03   * @param {Object} p The password that needs to be calculated
04   * @return {int} intScore The strength score of the password
05   */
06  var calcStrength = function(p) {
07   var intScore = 0;
08   // PASSWORD LENGTH
09   intScore += p.length;
10   
11   if(p.length > 0 && p.length <= 4) {                    // length 4 or less
12    intScore += p.length;
13   }
14   else if (p.length >= 5 && p.length <= 7) { // length between 5 and 7
15    intScore += 6;
16   }
17   else if (p.length >= 8 && p.length <= 15) { // length between 8 and 15
18    intScore += 12;
19    //alert(intScore);
20   }
21   else if (p.length >= 16) {               // length 16 or more
22    intScore += 18;
23    //alert(intScore);
24   }
25 
26   // LETTERS (Not exactly implemented as dictacted above because of my limited understanding of Regex)
27   if (p.match(/[a-z]/)) {              // [verified] at least one lower case letter
28    intScore += 1;
29   }
30   if (p.match(/[A-Z]/)) {              // [verified] at least one upper case letter
31    intScore += 5;
32   }
33   // NUMBERS
34   if (p.match(/\d/)) {              // [verified] at least one number
35    intScore += 5;
36   }
37   if (p.match(/.*\d.*\d.*\d/)) {            // [verified] at least three numbers
38    intScore += 5;
39   }
40 
41   // SPECIAL CHAR
42   if (p.match(/[!,@,#,$,%,^,&,*,?,_,~]/)) {           // [verified] at least one special character
43    intScore += 5;
44   }
45   // [verified] at least two special characters
46   if (p.match(/.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~]/)) {
47    intScore += 5;
48   }
49 
50   // COMBOS
51   if (p.match(/(?=.*[a-z])(?=.*[A-Z])/)) {        // [verified] both upper and lower case
52    intScore += 2;
53   }
54   if (p.match(/(?=.*\d)(?=.*[a-z])(?=.*[A-Z])/)) { // [verified] both letters and numbers
55    intScore += 2;
56   }
57    // [verified] letters, numbers, and special characters
58   if (p.match(/(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!,@,#,$,%,^,&,*,?,_,~])/)) {
59    intScore += 2;
60   }
61   return intScore;
62};

 

使用：

 

<input type="password" name="data[Shopkeeper][password]" value="" id="ShopkeeperPassword"  tabindex="3″ maxlength="32″/>

 

 JS：

 

var grade = calcStrength(this.value);//即可得到密码强度值

//我自己用的强度等级
var gradeMsg = grade <=0 ? " : (grade < 23 ? '弱' : (grade < 40 ? '一般' : (grade < 60 ? '强' : '极强'))) ;

 

 

 完整版演示及下载：http://testcases.pagebakers.com/PasswordMeter/