100 JavaScript Functional Code snippets that can be used directly

, native JavaScript implements string length interception

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2. Native JavaScript gets the domain host

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3. Native JavaScript Clear space

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4. Native JavaScript replaces all

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5. Native JavaScript Escape HTML tag

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6. Native JavaScript to restore HTML tags

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7. Native JavaScript time date format conversion

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8, native JavaScript to determine whether the number type

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9. Native JavaScript Set cookie value

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10. Native JavaScript Gets the cookie value

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11. Native JavaScript add to Favorite folder

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12. Native JavaScript Set as homepage

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13. Native JavaScript judgment IE6

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14. Native JavaScript load Style file

 1 function LoadStyle(url) {
 2         try {
 3             document.createStyleSheet(url)
 4         } catch(e) {
 5             var cssLink = document.createElement(‘link‘);
 6             cssLink.rel = ‘stylesheet‘;
 7             cssLink.type = ‘text/css‘;
 8             cssLink.href = url;
 9             var head = document.getElementsByTagName(‘head‘)[0];
10             head.appendChild(cssLink)
11         }
12     }

15. Native JavaScript returns script content

 1 function evalscript(s) {
 2         if(s.indexOf(‘<script‘) == -1) return s;
 3         var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig;
 4         var arr = [];
 5         while(arr = p.exec(s)) {
 6             var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;
 7             var arr1 = [];
 8             arr1 = p1.exec(arr[0]);
 9             if(arr1) {
10                 appendscript(arr1[1], ‘‘, arr1[2], arr1[3]);
11             } else {
12                 p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;
13                 arr1 = p1.exec(arr[0]);
14                 appendscript(‘‘, arr1[2], arr1[1].indexOf(‘reload=‘) != -1);
15             }
16         }
17         return s;
18     }

16. Native JavaScript clears script content

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17. Native JavaScript dynamic load script file

1 function appendscript(src, text, reload, charset) {
 2         var id = hash(src + text);
 3         if(!reload && in_array(id, evalscripts)) return;
 4         if(reload && $(id)) {
 5             $(id).parentNode.removeChild($(id));
 6         }
 7      
 8         evalscripts.push(id);
 9         var scriptNode = document.createElement("script");
10         scriptNode.type = "text/javascript";
11         scriptNode.id = id;
12         scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);
13         try {
14             if(src) {
15                 scriptNode.src = src;
16                 scriptNode.onloadDone = false;
17                 scriptNode.onload = function () {
18                     scriptNode.onloadDone = true;
19                     JSLOADED[src] = 1;
20                 };
21                 scriptNode.onreadystatechange = function () {
22                     if((scriptNode.readyState == ‘loaded‘ || scriptNode.readyState == ‘complete‘) && !scriptNode.onloadDone) {
23                         scriptNode.onloadDone = true;
24                         JSLOADED[src] = 1;
25                     }
26                 };
27             } else if(text){
28                 scriptNode.text = text;
29             }
30             document.getElementsByTagName(‘head‘)[0].appendChild(scriptNode);
31         } catch(e) {}
32     }

18. Native JavaScript returns the element object retrieved by ID

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19. Native JavaScript returns browser version content

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20. Common method for native JavaScript element display

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21, native JavaScript has InsertBefore method, but unfortunately there is no InsertAfter method? Use the following function to implement

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22. Native JavaScript compatible with browser binding element events

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23. The native JavaScript cursor pauses behind the text and is called when the text box gets focus

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24. Native JavaScript Verify URL link is valid

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25. Native JavaScript formatting CSS style code

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26. Native JavaScript compression CSS style code

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27. Native JavaScript Gets the current path

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28, the original javascriptip into an integral type

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29, native javascript integer type resolves to IP address

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30, Native JavaScript implementation checkbox Select All and do not select

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31, native JavaScript to determine whether mobile devices

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32, native JavaScript to determine whether mobile device access

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33. Native JavaScript to determine if Apple mobile device access

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34. Native JavaScript to determine if Android mobile device access

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35. Native JavaScript to determine if touch screen

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36. Native JavaScript to determine whether the Google browser on Android

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37, native JavaScript to determine whether to open the window

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38. Native JavaScript Gets the size of the mobile device initialization

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39. Native JavaScript Gets the maximum size of the mobile device

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40. Native JavaScript Gets the mobile device screen width

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41, native JavaScript perfect judge whether the URL

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42. Native JavaScript retrieves element objects based on style name

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43. Native JavaScript determines whether to start with a string

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44. Native JavaScript determines whether to end with a string

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45. Native JavaScript Returns the version number of IE browser

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46. Native JavaScript Gets the page height

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47. Native JavaScript Get page scrollleft

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48. Native JavaScript Gets the page visual width

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49. Native JavaScript Gets the page width

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50. Native JavaScript Get page scrolltop

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51. Native JavaScript Gets the page visual height

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52. Native JavaScript adds events across browsers

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53. Native JavaScript cross-browser Delete event

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54. Native JavaScript removes URL prefixes

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55. Native JavaScript random number timestamp

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56, native JavaScript full-width half-width conversion, icase:0 full to half, 1 half to full, others do not convert

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57. Native JavaScript to confirm that the keyboard is valid input value

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58. Native JavaScript Gets the location where the page is being rolled

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59. Native JavaScript Another regular date format function + Call method

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60. Native JavaScript time personalized output function

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61. Native javascript resolves offsetx compatibility issues

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62. Regular expressions commonly used by native JavaScript

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63, native JavaScript implementation return to the top of the general method

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64. Native JavaScript Gets the value of the get parameter in the URL

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65, native JavaScript implementation of the Universal method of selecting all

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66, native JavaScript implementation of all the common method of de-selection

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67. Native JavaScript implementation open a form common method

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68, native JavaScript to determine whether the client device

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69. Native JavaScript Gets the value of the radio button

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70. Native JavaScript Gets the value of the check box

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71, native JavaScript to determine whether the mailbox

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72. Native JavaScript to determine if there are dangerous characters in the list

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73, native JavaScript to determine whether the string is greater than the specified length

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74. Native JavaScript judgment string is case-insensitive for URLs

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75, native JavaScript to determine whether the string is a decimal

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76. Native JavaScript determines whether a string is an integer

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77. Native JavaScript Determines whether a string is a floating-point number

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78, native JavaScript judge whether the character is a-za-z English letter

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79. Native JavaScript to determine whether the string is postal code

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80. Native JavaScript determines if the character is empty null

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81. Native JavaScript uses regular expressions to extract all URLs in the page code

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82. Native JavaScript uses regular expressions to clear the same array (inefficient)

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83. Native JavaScript uses regular expressions to clear the same array (high efficiency)

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84. Native JavaScript uses regular expressions to sort the array by alphabetical order for each row

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85. Native JavaScript string reverse order

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86. Native JavaScript uses regular expressions to clear scripts in HTML code

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87. Native JavaScript dynamically executes JavaScript scripts

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88. Native JavaScript dynamically executes VBScript scripts

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89, native JavaScript implementation amount capitalization conversion function

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90. Large collection of regular expressions commonly used by native JavaScript

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91, native JavaScript implementation of the form Change event resize operation (compatible with the browser)

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92, native JavaScript with regular clear space around

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93, native JavaScript to determine whether the variable is null value

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94. Native JavaScript implements Base64 decoding

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95. Native JavaScript implements UTF8 decoding

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96. Native JavaScript Gets the width and height of the form's visible range

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97, native JavaScript judge ie version number (both concise and backward compatible!) ）

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98. Native JavaScript Gets the browser version number

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99. Native JavaScript half-width conversion to full-width function

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100. Native JavaScript full-width conversion to half-width function

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100 JavaScript Functional Code snippets that can be used directly