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Avoid tragedy JavaScript Password generator

Source: Internet
Author: User
Tags array sort
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I have prepared a password generation tool consisting of 0-9 and a-k English letters. The numbers are in disorder. Replace a random number with a letter to generate a password of 10.

 
 
    
  
  
  1. <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN"
    2. 
  
  
  2. Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>
    3. 
  
  
  3. <Html xmlns = "http://www.w3.org/1999/xhtml">
    4. 
  
  
  4. <Head>
    5. 
  
  
  5. <Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
    6. 
  
  
  6. <Title> </title>
    7. 
  
  
  7. </Head>
    8. 
  
  
  8. <Body>
    9. 
  
  
  9. <Div>
    10. 
  
  
  10. 
  
  
  11. <Input id = "strat" type = "button" value = "start"/>
    12. 
  
  
  12. <Textarea rows = "10" cols = "25" id = "password"> </textarea>
    13. 
  
  
  13. </Div>
    14. 
  
  
  14. <Script type = "text/javascript">
    15. 
  
  
  15. Void function (window, doc, undefined ){
    16. 
  
  
  16. Var array = [], text = 'abcdefghjk ', key, password = '', btn = doc. getElementById ('strat'), textarea = doc. getElementById ('Password ');
    17. 
  
  
  17. 
  
  
  18. Function unorderedArray (array ){
    19. 
  
  
  19. If ({}). toString. call (array). indexOf ('array') ===-1) return;
    20. 
  
  
  20. Var arr = [], value = array. toString ();
    21. 
  
  
  21. Arr = array. sort (function () {return Math. random ()> 0.5? -1:1 ;});
    22. 
  
  
  22. (Arr. toString () === value) & arguments. callee (array );
    23. 
  
  
  23. Return arr;
    24. 
  
  
  24. }
    25. 
  
  
  25. 
  
  
  26. 
  
  
  27. Btn. onclick = function (){
    28. 
  
  
  28. Key = Math. random (). toFixed (1) * 10-1;
    29. 
  
  
  29. Array = [,];
    30. 
  
  
  30. Password = unorderedArray (array );
    31. 
  
  
  31. Password [key] = text [key];
    32. 
  
  
  32. Textarea. innerHTML = password. join ('');
    33. 
  
  
  33. }
    34. 
  
  
  34. } (Window, document );
    35. 
  
  
  35. 
  
  
  36. 
  
  
  37. // Console. log (unorderedArray ());
    38. 
  
  
  38. </Script>
    39. 
  
  
  39. 
  
  
  40. </Body>
    41. 
  
  
  41. </Html>
    42.

How to sort arrays in disorder is a poor math. After searching, input such a function to the array sort.

Sort is really powerful.

 
 
    
  
  
  1. function unorderedArray(array){  
    2. 
  
  
  2.         if(({}).toString.call(array).indexOf('Array')===-1) return;  
    3. 
  
  
  3.         var arr=[],value=array.toString();  
    4. 
  
  
  4.         arr=array.sort(function(){return Math.random()>0.5?-1:1;});  
    5. 
  
  
  5.         (arr.toString()===value) && arguments.callee(array);  
    6. 
  
  
  6.         return arr;  
    7. 
  
  
  7. } 
    8.

When using this method, we should avoid the generation of arrays, which is the same as the input array. This is a waste of effort, because the array is of a complex type and all modifications will change. Therefore, a variable is used to cache the value of the input array = array. toString (), and then the value of the array I generated is compared if it is relatively recursive. Ensure that the generated array is not sequential.

Use the following code to generate a random number 0-9.

 
 
    
  
  
  1. Math.random().toFixed(1) * 10-1; 
    2.

Use this serial number to get a letter from a-k, and use this letter to replace the numbers at the corresponding position of the serial number in the array.

Concatenate the obtained Array Using the join method of the array

 
 
    
  
  
  1. password.join(''); 
    2.

Obtain a key.

Original article: http://www.cnblogs.com/enix/archive/2011/12/22/2297913.html

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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