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The use of Charat (), charCodeAt () in JavaScript

Source: Internet
Author: User
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1, charCodeAt returns the ASCII value of the character under the current index
2, Charat returns the character under the current index
The following code gets the numeric character in the string:

 
 
    
  
  
  1. 
  
  2. 
  
  
  3. 
  
  4. 
  
  
  5. 
  
  6. <title> function Overload-www.cxybl.com</title>
    7. 
  
  
  7. 
  
  8. <script type= "Text/javascript" >
    9. 
  
  
  9. 
  
  10. function GetNumber (str) {
    11. 
  
  
  11. 
  
  12. alert (str.length);
    13. 
  
  
  13. 
  
  14. var num = "";
    15. 
  
  
  15. 
  
  16. for (var i = 0; i < str.length i + +) {
    17. 
  
  
  17. 
  
  18. if (Str.charcodeat (i) >= && str.charcodeat (i) <= 57) {
    19. 
  
  
  19. 
  
  20. num + + str.charat (i);
    21. 
  
  
  21. 
  
  22. }
    23. 
  
  
  23. 
  
  24. }
    25. 
  
  
  25. 
  
  26. return num;
    27. 
  
  
  27. 
  
  28. }
    29. 
  
  
  29. 
  
  30. </script>
    31. 
  
  
  31. 
  
  32. 
  
  
  33. 
  
  34. <body>
    35. 
  
  
  35. 
  
  36. <script type= "Text/javascript" >
    37. 
  
  
  37. 
  
  38. var teststr = "1ts2";
    39. 
  
  
  39. 
  
  40. Alert (GetNumber (TESTSTR));
    41. 
  
  
  41. 
  
  42. </script>
    43. 
  
  
  43. 
  
  44. </body>
    45. 
  
  
  45. 
  
  46.


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