1. // Example usage: http://jsfiddle.net/q2gnX/
3. var formatJson = function(json, options) {
4. var reg = null,
5. formatted = '',
6. pad = 0,
7. PADDING = ' '; // one can also use '\t' or a different number of spaces
9. // optional settings
10. options = options || {};
11. // remove newline where '{' or '[' follows ':'
12. options.newlineAfterColonIfBeforeBraceOrBracket = (options.newlineAfterColonIfBeforeBraceOrBracket === true) ? true : false;
13. // use a space after a colon
14. options.spaceAfterColon = (options.spaceAfterColon === false) ? false : true;
16. // begin formatting...
17. if (typeof json !== 'string') {
18. // make sure we start with the JSON as a string
19. json = JSON.stringify(json);
20. } else {
21. // is already a string, so parse and re-stringify in order to remove extra whitespace
22. json = JSON.parse(json);
23. json = JSON.stringify(json);
24. }
26. // add newline before and after curly braces
27. reg = /([\{\}])/g;
28. json = json.replace(reg, '\r\n$1\r\n');
30. // add newline before and after square brackets
31. reg = /([\[\]])/g;
32. json = json.replace(reg, '\r\n$1\r\n');
34. // add newline after comma
35. reg = /(\,)/g;
36. json = json.replace(reg, '$1\r\n');
38. // remove multiple newlines
39. reg = /(\r\n\r\n)/g;
40. json = json.replace(reg, '\r\n');
42. // remove newlines before commas
43. reg = /\r\n\,/g;
44. json = json.replace(reg, ',');
46. // optional formatting...
47. if (!options.newlineAfterColonIfBeforeBraceOrBracket) {
48. reg = /\:\r\n\{/g;
49. json = json.replace(reg, ':{');
50. reg = /\:\r\n\[/g;
51. json = json.replace(reg, ':[');
52. }
53. if (options.spaceAfterColon) {
54. reg = /\:/g;
55. json = json.replace(reg, ':');
56. }
58. $.each(json.split('\r\n'), function(index, node) {
59. var i = 0,
60. indent = 0,
61. padding = '';
63. if (node.match(/\{$/) || node.match(/\[$/)) {
64. indent = 1;
65. } else if (node.match(/\}/) || node.match(/\]/)) {
66. if (pad !== 0) {
67. pad -= 1;
68. }
69. } else {
70. indent = 0;
71. }
73. for (i = 0; i < pad; i++) {
74. padding += PADDING;
75. }
77. formatted += padding + node + '\r\n';
78. pad += indent;
79. });
81. return formatted;
82. };

使用方法：

1. var json={
   "name":"HTL","sex":"男","age":"24"};
2. console.log(formatJson(json));

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