js获取设备

总结了一个JavaScript获取当前终端类型（pc， mobile），操作系统类型，浏览器类型，浏览器版本的小工具。

个人觉得还行，测试过没有问题，能识别ie7以及以上。

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/**     author: Weihuan     date: 2017-6-26 **/ var _AgentInfo = {     deviceType: "",  // pc or mobile     OSname: "",         // windows, Android, linux and so on...     browserName: "",    //  chrome, safari, firefox, IE and so on...     browserVer: "",   //  browser version， important if in IE environment.     adaptType: 0,           // A type value, Adapt to the screen due to width     _init: function(){         _AgentInfo.setDeviceAndOS();         _AgentInfo.setBrowser();     },     setDeviceAndOS: function(){         var name = "unknown";         if(window.navigator.userAgent.indexOf("Android") != -1){             name = "Android";         }else if(window.navigator.userAgent.indexOf("iPhone") != -1){             name = "iPhone";         }else if(window.navigator.userAgent.indexOf("SymbianOS") != -1){             name = "SymbianOS";         }else if(window.navigator.userAgent.indexOf("Windows Phone") != -1){             name = "Windows Phone";         }else if(window.navigator.userAgent.indexOf("iPad") != -1){             name = "iPad";         }else if(window.navigator.userAgent.indexOf("iPod") != -1){             name = "iPod";         }         if(name != "unknown"){             _AgentInfo.OSname = name;             _AgentInfo.deviceType = "mobile";             return;         }         if (window.navigator.userAgent.indexOf("Windows NT 10.0")!= -1){             name="Windows 10";         }else if (window.navigator.userAgent.indexOf("Windows NT 6.2") != -1){             name="Windows 8";         }else if (window.navigator.userAgent.indexOf("Windows NT 6.1") != -1){             name="Windows 7";         }else if (window.navigator.userAgent.indexOf("Windows NT 6.0") != -1){             name="Windows Vista";         }else if (window.navigator.userAgent.indexOf("Windows NT 5.1") != -1){             name="Windows XP";         }else if (window.navigator.userAgent.indexOf("Windows NT 5.0") != -1){             name="Windows 2000";         }else if (window.navigator.userAgent.indexOf("Mac") != -1){             name="Mac/iOS";         }else if (window.navigator.userAgent.indexOf("X11") != -1){             name="UNIX";         }else if (window.navigator.userAgent.indexOf("Linux") != -1){             name="Linux";         }         _AgentInfo.OSname = name;         _AgentInfo.deviceType = "pc";     },     setBrowser: function(){         var nAgt = navigator.userAgent;         var browserName  = navigator.appName;         var fullVersion  = ''+parseFloat(navigator.appVersion);         var majorVersion = parseInt(navigator.appVersion,10);         var nameOffset,verOffset,ix;         if ((verOffset=nAgt.indexOf("Opera"))!=-1) { // In Opera, the true version is after "Opera" or after "Version"          browserName = "Opera";          fullVersion = nAgt.substring(verOffset+6);          if ((verOffset=nAgt.indexOf("Version"))!=-1)              fullVersion = nAgt.substring(verOffset+8);         }         else if ( (nAgt.indexOf("Trident"))!=-1 ) {   // ( ver >= ie7) In MSIE, the true version is after "MSIE" in userAgent             if((verOffset=nAgt.indexOf("MSIE"))!=-1){                 fullVersion = nAgt.substring(verOffset+5);             }else {                 fullVersion = '11.0';             }             if(fullVersion == 5){                 fullVersion = "11.0";             }             browserName = "IE";         }         else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {  // In Chrome, the true version is after "Chrome"          browserName = "Chrome";          fullVersion = nAgt.substring(verOffset+7);         }         else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {   // In Safari, the true version is after "Safari" or after "Version"          browserName = "Safari";          fullVersion = nAgt.substring(verOffset+7);          if ((verOffset=nAgt.indexOf("Version"))!=-1)              fullVersion = nAgt.substring(verOffset+8);         }         else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {    // In Firefox, the true version is after "Firefox"          browserName = "Firefox";          fullVersion = nAgt.substring(verOffset+8);         }         else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ){   // In most other browsers, "name/version" is at the end of userAgent          browserName = nAgt.substring(nameOffset,verOffset);          fullVersion = nAgt.substring(verOffset+1);          if (browserName.toLowerCase()==browserName.toUpperCase()) {             browserName = navigator.appName;          }         }         if ((ix=fullVersion.indexOf(";"))!=-1)        // trim the fullVersion string at semicolon/space if present              fullVersion=fullVersion.substring(0,ix);         if ((ix=fullVersion.indexOf(" "))!=-1)              fullVersion=fullVersion.substring(0,ix);         majorVersion = parseInt(''+fullVersion,10);         if (isNaN(majorVersion)) {          fullVersion  = ''+parseFloat(navigator.appVersion);          majorVersion = parseInt(navigator.appVersion,10);         }         _AgentInfo.browserName = browserName;         _AgentInfo.browserVer = fullVersion;     },     isMobile: function(){         if(_AgentInfo.deviceType == "mobile"){             return true;         }         return false;     },     setAdaptType(){     // A type value, Adapt to the screen due to width. For convenient         if(screen.width <= 374){             _AgentInfo.adaptType = 0;         }else if(screen.width <= 413){             _AgentInfo.adaptType = 1;         }else {             _AgentInfo.adaptType = 2;         }     } }