判断浏览器的版本，出现低版本提示

 1 var BrowserVision = {
 2     Get: function () {
 3         /// <summary>
 4         ///    获取浏览器名称及版本
 5         /// </summary>
 6         /// <returns type="String"/>
 7         var agent = navigator.userAgent;
 8         var browser = "";
 9         var version = "";
10         if (/MSIE/.test(agent)) {
11             browser = "IE";
12             var reg_match = agent.match(/MSIE[\w\W]+;/)[0];
13             reg_match = reg_match.split(";")[0];
14             version = reg_match.split(" ")[1];
15         }
16         else if (/Trident/.test(agent) && /rv:11.0/.test(agent)) {
17             browser = "IE";
18             version = "11.0"
19         }
20         else if (/Safari/.test(agent) && !(/Chrome/.test(agent)) && !(/Edge/.test(agent))) {
21             var reg_match = agent.match(/Safari\/[\w\W]+$/)[0];
22             browser = "Safari";
23             version = reg_match.split("/")[1];
24         }
25         else if (/Safari/.test(agent) && /Chrome/.test(agent) && !(/Edge/.test(agent))) {
26             var reg_match = agent.match(/Chrome\/[\w\W]+\s/)[0];
27             browser = "Chrome";
28             version = reg_match.split("/")[1];
29         }
30         else if (/Safari/.test(agent) && /Edge/.test(agent)) {
31             var reg_match = agent.match(/Edge\/[\w\W]+$/)[0];
32             browser = "Edge";
33             version = reg_match.split("/")[1];
34         }
35         else {
36             browser = "Unknow";
37             version = "0";
38         }
39         return browser + "," + version;
40     },
41     IsIE: function () {
42         /// <summary>
43         ///    判定是否为IE
44         ///    &#10;--是返回1，否则返回0
45         /// </summary>
46         /// <returns type="int"/>
47         var agent = navigator.userAgent;
48         if (/MSIE/.test(agent) || (/Trident/.test(agent) && /rv:11.0/.test(agent))) {
49             return 1;
50         }
51         else {
52             return 0;
53         }
54     },
55     IELowerThan: function (version) {
56         /// <summary>
57         ///    判定IE是否小于指定版本
58         ///    &#10;--是返回1
59         ///    &#10;--不小于指定版本返回0；不是IE返回0；错误的参数返回0
60         /// </summary>
61         /// <param type="float" name="version">
62         ///   版本号
63         /// </param>
64         /// <returns type="int"/>
65         if (version != undefined && !isNaN(version)) {
66             var browser = BrowserVision.Get();
67             if (/IE/.test(browser)) {
68                 var brow_ver = parseFloat(browser.split(",")[1]);
69                 var version = parseFloat(version);
70                 if (brow_ver < version) {
71                     return 1;
72                 }
73                 else {
74                     return 0;
75                 }
76             }
77             else {
78                 return 0;
79             }
80         }
81         else {
82             return 0;
83         }
84     }
85 }