PHP （20140516）

用Ajax验证验证码：

 1 var xmlHttp;

 2 function getXmlHttp(){

 3     if(window.ActiveXObject){

 4         xmlHttp = new ActiveXObject("MICROSOFT.XMLHTTP");

 5     }else if(window.XMLHttpRequest){

 6         xmlHttp = new XMLHttpRequest();

 7     }

 8 }

 9

10 function checkYZM(){

11

12

13     getXmlHttp();

14     var  f = false;

15     xmlHttp.open("GET","checkYZM.php?yzm="+yzm.value,false);

16     xmlHttp.onreadystatechange = function(){

17         if(xmlHttp.readyState == 4){

18             if(xmlHttp.status == 200){

19                 var str = parseInt(xmlHttp.responseText);

20                 if(str){

21                     yzmCheck.innerHTML = "验证成功!";

22                     f = true;

23                 }else{

24                     yzmCheck.innerHTML = "验证失败!";

25                     f = false;

26                 }

27             }

28         }

29     }

30     xmlHttp.send(null);

31     return f;

32

33 }

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