判断网站是不是移动端访问，如果是自动跳转到手机网站

 1 function mobile_device_detect(url) {
 2     var thisOS = navigator.platform;
 3     var os = new Array("iPhone", "iPod", "iPad", "android", "Nokia", "SymbianOS", "Symbian", "Windows Phone", "Phone", "Linux armv71", "MAUI", "UNTRUSTED/1.0", "Windows CE", "BlackBerry", "IEMobile");
 4     for (var i = 0; i < os.length; i++) {
 5         if (thisOS.match(os[i])) {
 6             window.location = url
 7         }
 8     }
 9     if (navigator.platform.indexOf('iPad') != -1) {
10         window.location = url
11     }
12     var check = navigator.appVersion;
13     if (check.match(/linux/i)) {
14         if (check.match(/mobile/i) || check.match(/X11/i)) {
15             window.location = url
16         }
17     }
18     Array.prototype.in_array = function(e) {
19         for (i = 0; i < this.length; i++) {
20             if (this[i] == e) return true
21         }
22         return false
23     }
24 }
25 mobile_device_detect("http://m.xxx.com");