Ajax的小封装 get,post请求

Ajax的小封装对ajax的get请求的小封装

2. function Ajax() {
3. var xhr =null;
4. if(window.XMLHttpRequest) {
5. xhr = new XMLHttpRequest();
6. } else {
8. xhr = new ActiveXObject("Microsoft.XMLHttp");
9. }
10. this.get=function(url,success,fail){ //get请求
11. xhr.open("GET", "1.jsp",true);
12. xhr.onreadystatechange=function(){
13. if(xhr.readyState==4) {
14. alert(xhr.status);
15. if(xhr.status==200) {
16. var txt = xhr.responseText;
17. txt = eval("("+txt+")");
18. var ch = txt.charAt(0);
19. if(ch==" var xml = xhr.responseXML;
20. success(eval("("+xml+")"));
21. } else if(ch=="["||ch=="{") {//json类型
22. txt = eval("("+txt+")");
23. success(txt);
24. } else {//不知道直接返回
26. success(txt);
27. }
28. } else {
29. if(fail) {
30. fail(xhr.status);
31. }
32. }
33. }
35. };
36. xhr.send(null);
38. };
41. this.post = function (url,param,success,fail) {//post请求
42. xhr.open("POST", "1.jsp",true);
43. xhr.onreadystatechange=function(){
44. if(xhr.readyState==4) {
45. alert(xhr.status);
46. if(xhr.status==200) {
47. var txt = xhr.responseText;
48. var ch = txt.charAt(0);
49. if(ch==" var xml = xhr.responseXML;
50. success(eval("("+xml+")"));
51. } else if(ch=="["||ch=="{") {//json类型
52. txt = eval("("+txt+")");
53. success(txt);
54. } else {//不知道直接返回
56. success(txt);
57. }
59. } else {
60. if(fail) {
61. fail(xhr.status);
62. }
63. }
64. }
66. };
67. xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
68. xhr.send(param);
69. };
71. }

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