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Ajax開發記錄二: xmlhttp創建的另一種方式

Posted on 2007-02-28 15:48 青島小哥閱讀(182) 評論(0) 編輯收藏

另一種創建方式。似乎更加簡潔明了。用2個function完美的創建和調用xmlhttp Object。

????//xmlhttp.js
?2

????
?3

????//Function?to?create?an?XMLHttp?Object.
?4

????function?getxmlhttp?(){
?5

????????//Create?a?boolean?variable?to?check?for?a?valid?microsoft?active?X?instance.
?6

????????var?xmlhttp?=?false;
?7

????????
?8

????????//Check?if?we?are?using?internet?explorer.
?9

????????try?{
10

????????????//If?the?javascript?version?is?greater?than?5.
11

????????????xmlhttp?=?new?ActiveXObject("Msxml2.XMLHTTP");
12

????????}?catch?(e)?{
13

????????????//If?not,?then?use?the?older?active?x?object.
14

????????????try?{
15

????????????????//If?we?are?using?internet?explorer.
16

????????????????xmlhttp?=?new?ActiveXObject("Microsoft.XMLHTTP");
17

????????????}?catch?(E)?{
18

????????????????//Else?we?must?be?using?a?non-internet?explorer?browser.
19

????????????????xmlhttp?=?false;
20

????????????}
21

????????}
22

????????
23

????????//If?we?are?using?a?non-internet?explorer?browser,?create?a?javascript?instance?of?the?object.
24

????????if?(!xmlhttp?&&?typeof?XMLHttpRequest?!=?'undefined')?{
25

????????????xmlhttp?=?new?XMLHttpRequest();
26

????????}
27

????????
28

????????return?xmlhttp;
29

????}
30

????
31

????//Function?to?process?an?XMLHttpRequest.
32

????function?processajax?(obj,?serverPage){
33

????????//Get?an?XMLHttpRequest?object?for?use.
34

????????var?theimg;
35

????????xmlhttp?=?getxmlhttp?();
36

????????xmlhttp.open("GET",?serverPage);
37

????????xmlhttp.onreadystatechange?=?function()?{
38

????????????if?(xmlhttp.readyState?==?4?&&?xmlhttp.status?==?200)?{
39

????????????????document.getElementById(obj).innerHTML?=?xmlhttp.responseText;
40

????????????}
41

????????}
42

????????xmlhttp.send(null);
43

????}

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