js判断浏览器类型和访问来源

userAgent 属性是一个只读的字符串，声明了浏览器用于 HTTP 请求的用户代理头的值。

一般来讲，它是在 navigator.appCodeName 的值之后加上斜线和 navigator.appVersion 的值构成的。

例如：Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322)。

注：用户代理头：user-agent header。

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判断浏览器类型

//判断当前浏览类型 
 function BrowserType() 
 { 
   var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串 
   var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器 
   var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器 
   var isEdge = userAgent.indexOf("Windows NT 6.1; Trident/7.0;") > -1 && !isIE; //判断是否IE的Edge浏览器 
   var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器 
   var isSafari = userAgent.indexOf("Safari") > -1 && userAgent.indexOf("Chrome") == -1; //判断是否Safari浏览器 
   var isChrome = userAgent.indexOf("Chrome") > -1 && userAgent.indexOf("Safari") > -1; //判断Chrome浏览器 
 
   if (isIE)  
   { 
      var reIE = new RegExp("MSIE (\\d+\\.\\d+);"); 
      reIE.test(userAgent); 
      var fIEVersion = parseFloat(RegExp["$1"]); 
      if(fIEVersion == 7) 
      { return "IE7";} 
      else if(fIEVersion == 8) 
      { return "IE8";} 
      else if(fIEVersion == 9) 
      { return "IE9";} 
      else if(fIEVersion == 10) 
      { return "IE10";} 
      else if(fIEVersion == 11) 
      { return "IE11";} 
      else 
      { return "0"}//IE版本过低 
    }//isIE end 
     
    if (isFF) { return "FF";} 
    if (isOpera) { return "Opera";} 
    if (isSafari) { return "Safari";} 
    if (isChrome) { return "Chrome";} 
    if (isEdge) { return "Edge";} 
  }

判断浏览器访问来源

方法1

window.location.href = /Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent) ? "https://www.baidu.com/" :  "http://news.baidu.com/";

方法2

function IsPC() {
    var userAgentInfo = navigator.userAgent;
    var Agents = ["Android", "iPhone",
                "SymbianOS", "Windows Phone",
                "iPad", "iPod"];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

方法3

function browserRedirect() {
    var sUserAgent = navigator.userAgent.toLowerCase();
    var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
    var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
    var bIsMidp = sUserAgent.match(/midp/i) == "midp";
    var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
    var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
    var bIsAndroid = sUserAgent.match(/android/i) == "android";
    var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
    var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
    if (!(bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) ){
        window.location.href=B页面;
    }
}
browserRedirect();