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JavaScript code generation

Source: Internet
Author: User
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Code:
  1. <PRE name = "code" class = "JS"> <! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  2. <HTML xmlns = "http://www.w3.org/1999/xhtml">
  3. <Head>
  4. <Title> No title page </title>
  5. <Style type = "text/CSS">
  6. . Code
  7. {
  8. Background-image: url(code.jpg );
  9. Font-family: Arial;
  10. Font-style: italic;
  11. Color: red;
  12. Border: 0;
  13. Padding: 2px 3px;
  14. Letter-Spacing: 3px;
  15. Font-weight: bolder;
  16. }
  17. . Unchanged
  18. {
  19. Border: 0;
  20. }
  21. </Style>
  22. <Script language = "javascript" type = "text/javascript">
  24. Var code; // define the verification code globally
  25. Function createCode ()
  26. {
  27. Code = "";
  28. VaR codelength = 4; // The length of the Verification Code
  29. VaR checkcode = Document. getelementbyid ("checkcode ");
  30. VaR selectchar = new array (, 'A', 'B', 'C', 'D', 'E', 'F ', 'G', 'h', 'I', 'J', 'k', 'l', 'M', 'n', 'O', 'P ', 'Q', 'R', 's', 't', 'U', 'V', 'w', 'x', 'y ', 'Z'); // all the characters whose candidates constitute the verification code. Of course, they can also be in Chinese.
  32. For (VAR I = 0; I <codelength; I ++)
  33. {
  36. Var charIndex = Math. floor (Math. random () * 36 );
  37. Code + = selectChar [charIndex];
  40. }
  41. // Alert (code );
  42. If (checkCode)
  43. {
  44. CheckCode. className = "code ";
  45. CheckCode. value = code;
  46. }
  48. }
  50. Function validate ()
  51. {
  52. Var inputCode = document. getElementById ("input1"). value;
  53. If (inputCode. length <= 0)
  54. {
  55. Alert ("Enter the verification code! ");
  56. }
  57. Else if (inputcode! = Code)
  58. {
  59. Alert ("Incorrect verification code! ");
  60. Createcode (); // refresh the verification code
  61. }
  62. Else
  63. {
  64. Alert ("^-^ OK ");
  65. }
  67. }
  69. </Script>
  70. </Head>
  71. <Body onload = "createCode ()">
  72. <Form action = "#">
  73. <Input type = "text" id = "input1"/>
  74. <Input type = "text" onclick = "createcode ()" readonly = "readonly" id = "checkcode" class = "unchanged" style = "width: 80px "/> <br/>
  75. <Input id = "button1" onclick = "Validate ();" type = "button" value = "OK"/>
  76. </Form>
  77. </Body>
  78. </Html> </PRE>

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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