各位同學小程序中碰到上傳圖片或者文件時有用到formData的 
formData Object 否 HTTP 請求中其他額外的 form data 
出現(xiàn)中文無法上傳或者出現(xiàn)亂碼時可以參考一下這篇跳坑指南微信小程序聯(lián)盟-uploadFile跳坑指南 
里面講的很詳細了，這里歸納一下，解決方法： 
在formData中對文字進行編碼，使用encodeURI() 
wxml中例：

1. formData: {
2. name:encodeURI(name),
3. address:encodeURI(address),
4. }, // HTTP 請求中其他額外的 form data

上網(wǎng)搜了很多：  UrlEncode編碼/UrlDecode解碼使用方法  UrlEncode編碼主要用于將字符串以URL編碼，返回一個字符串；  使用方法：  1、ASP中的用法：Server.URLEncode(“內(nèi)容”) 例如：

1. <%response.writeServer.UrlEncode("賴雪平網(wǎng)絡營銷博客")%>

2、PHP中的用法：urlencode(“內(nèi)容”) 例如：

1. <?echourlencode("賴雪平網(wǎng)絡營銷博客")?>

3、JSP中的用法：URLEncoder.encode(“內(nèi)容”) 例如：

1. <%java.net.URLEncoder.encode("賴雪平網(wǎng)絡營銷博客"); %>

UrlDecode解碼主要對字符串進行URL解碼，返回已解碼的字符串；  1、ASP中的用法：Server.UrlDecode(“內(nèi)容”) 例如：

1. <%response.writeServer.UrlDecode("%C0%B5%D1%A9%C6%BD%CD%F8%C2%E7%D3%AA%CF%FA%B2%A9%BF%CD")%>

2、PHP中的用法：urldecode(“內(nèi)容”) 例如：

1. <?echourldecode("%C0%B5%D1%A9%C6%BD%CD%F8%C2%E7%D3%AA%CF%FA%B2%A9%BF%CD")?>

3、JSP中的用法：URLDecoder.decode(“內(nèi)容”) 例如：

1. <%java.net.URLDecoder.decode("%C0%B5%D1%A9%C6%BD%CD%F8%C2%E7%D3%AA%CF%FA%B2%A9%BF%CD"); %>

發(fā)現(xiàn)沒有nodejs后臺的，還好皇天不負有心人，找到有用js寫的decodeurl函數(shù)，給大家分享一下，有用的同學可以看一下。  js代碼：

1. function urldecode (str) {
2. var hash_map = {}, ret = str.toString(), unicodeStr='', hexEscStr='';
3. var replacer = function (search, replace, str) {
4. var tmp_arr = [];
5. tmp_arr = str.split(search);
6. return tmp_arr.join(replace);
7. };
8. // The hash_map is identical to the one in urlencode.
9. hash_map["'"] = ''';
10. hash_map['('] = '(';
11. hash_map[')'] = ')';
12. hash_map['*'] = '*';
13. hash_map['~'] = '~';
14. hash_map['!'] = '!';
15. hash_map[' '] = ' ';
16. hash_map['\u00DC'] = '?';
17. hash_map['\u00FC'] = '?';
18. hash_map['\u00C4'] = '?';
19. hash_map['\u00E4'] = '?';
20. hash_map['\u00D6'] = '?';
21. hash_map['\u00F6'] = '?';
22. hash_map['\u00DF'] = '?';
23. hash_map['\u20AC'] = '?';
24. hash_map['\u0081'] = '?';
25. hash_map['\u201A'] = '?';
26. hash_map['\u0192'] = '?';
27. hash_map['\u201E'] = '?';
28. hash_map['\u2026'] = '?';
29. hash_map['\u2020'] = '?';
30. hash_map['\u2021'] = '?';
31. hash_map['\u02C6'] = '?';
32. hash_map['\u2030'] = '?';
33. hash_map['\u0160'] = '?';
34. hash_map['\u2039'] = '?';
35. hash_map['\u0152'] = '?';
36. hash_map['\u008D'] = '?';
37. hash_map['\u017D'] = '?';
38. hash_map['\u008F'] = '?';
39. hash_map['\u0090'] = '?';
40. hash_map['\u2018'] = '?';
41. hash_map['\u2019'] = '?';
42. hash_map['\u201C'] = '?';
43. hash_map['\u201D'] = '?';
44. hash_map['\u2022'] = '?';
45. hash_map['\u2013'] = '?';
46. hash_map['\u2014'] = '?';
47. hash_map['\u02DC'] = '?';
48. hash_map['\u2122'] = '?';
49. hash_map['\u0161'] = '?';
50. hash_map['\u203A'] = '?';
51. hash_map['\u0153'] = '?';
52. hash_map['\u009D'] = '?';
53. hash_map['\u017E'] = '?';
54. hash_map['\u0178'] = '?';
55. hash_map['\u00C6'] = 'Æ';
56. hash_map['\u00D8'] = 'Ø';
57. hash_map['\u00C5'] = 'Å';
58. for (unicodeStr in hash_map) {
59. hexEscStr = hash_map[unicodeStr]; // Switch order when decoding
60. ret = replacer(hexEscStr, unicodeStr, ret); // Custom replace. No regexing
61. }
62. // End with d
63. ecodeURIComponent, which most resembles PHP's encoding functions
64. ret = decodeURIComponent(ret);
65. return ret;
66. }

至于怎么用，相信看得懂js的一看就知道了，直接調(diào)用函數(shù)就行了。  唉！小程序坑真心多??！剛爬出來一個又掉入一個。  但是呢，從哪里掉進去就要再從哪里爬出來