createXhr

 1 var o = {
 2         createXhr : function(){
 3             try {
 4                 console.log("xx");
 5                 return new XMLHttpRequest();
 6             }catch(e){}
 7             try{
 8                 return new ActiveXObject("Microsoft.XMLHTTP");
 9             }catch(e){}
10         }
11     };
12     o.createXhr();// xx
13     o.createXhr();// xx
14     o.createXhr();// xx

 1 var O = {
 2         createXhr : (function(){
 3             try {
 4                 console.log("yy");
 5                 return new XMLHttpRequest();
 6             }catch(e){}
 7             try{
 8                 return new ActiveXObject("Microsoft.XMLHTTP");
 9             }catch(e){}
10         })(),
11 
12         name : "NIck"
13     };
14     O.createXhr;
15     O.createXhr;
16     O.createXhr;
17 
18     var p = {
19         createXhr : (function(){
20             var f;
21             if(window.XMLHttpRequest){
22                 f = new XMLHttpRequest();
23             }else{
24                 f = new ActiveXObject("Microsoft.XMLHTTP");
25             }
26             return f;
27         })()
28     };
29 
30     console.log(p.createXhr);// XMLHttpRequest