获得当前浏览器JS的版本

 1 获得当前浏览器JS的版本
 2 function getjsversion(){
 3     var n = navigator;
 4     var u = n.userAgent;
 5     var apn = n.appName;
 6     var v = n.appVersion;
 7     var ie = v.indexOf('MSIE ');
 8     if (ie > 0){
 9         apv = parseInt(i = v.substring(ie + 5));
10         if (apv > 3) {
11             apv = parseFloat(i);
12         }
13     } else {
14         apv = parseFloat(v);
15     }
16     var isie = (apn == 'Microsoft Internet Explorer');
17     var ismac = (u.indexOf('Mac') >= 0);
18     var javascriptVersion = "1.0";
19     if (String && String.prototype) {
20         javascriptVersion = '1.1';
21         if (javascriptVersion.match) {
22             javascriptVersion = '1.2';
23             var tm = new Date;
24             if (tm.setUTCDate) {
25                 javascriptVersion = '1.3';
26                 if (isie && ismac && apv >= 5) javascriptVersion = '1.4';
27                 var pn = 0;
28                 if (pn.toPrecision) {
29                     javascriptVersion = '1.5';
30                     a = new Array;
31                     if (a.forEach) {
32                         javascriptVersion = '1.6';
33                         i = 0;
34                         o = new Object;
35                         tcf = new Function('o', 'var e,i=0;try{i=new Iterator(o)}catch(e){}return i');
36                         i = tcf(o);
37                         if (i && i.next) {
38                             javascriptVersion = '1.7';
39                         }
40                     }
41                 }
42             }
43         }
44     }
45     return javascriptVersion;
46 }
47 　　
48 
49 获取当前点击事件的Object对象
50 function getEvent() {
51     if (document.all) {
52         return window.event; //如果是ie
53     }
54     func = getEvent.caller;
55     while (func != null) {
56         var arg0 = func.arguments[0];
57         if (arg0) {
58             if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
59 || (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
60                 return arg0;
61             }
62         }
63         func = func.caller;
64     }
65     return null;
66 };
67