function IsSafari() {

  var is_safari = navigator.userAgent.toLowerCase().indexOf('safari/') > -1;
  return is_safari;

}

var ua = navigator.userAgent.toLowerCase();
if (ua.indexOf('safari') != -1) {
  if (ua.indexOf('chrome') > -1) {
    alert("1") // Chrome
  } else {
    alert("2") // Safari
  }
}

var isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);

var isSafari = navigator.vendor && navigator.vendor.indexOf('Apple') > -1 &&
               navigator.userAgent && !navigator.userAgent.match('CriOS');

if (navigator.userAgent.search("Safari") >= 0 && navigator.userAgent.search("Chrome") < 0)
{
   alert("Browser is Safari");
}

var isSafari = window.safari !== undefined;
if (isSafari) console.log("Safari, yeah!");

navigator.vendor ==  "Apple Computer, Inc."

navigator.vendor ==  "Google Inc."

navigator.vendor ==  ""

navigator.vendor ==  undefined

function getBrowserName() {
    var name = "Unknown";
    if(navigator.userAgent.indexOf("MSIE")!=-1){
        name = "MSIE";
    }
    else if(navigator.userAgent.indexOf("Firefox")!=-1){
        name = "Firefox";
    }
    else if(navigator.userAgent.indexOf("Opera")!=-1){
        name = "Opera";
    }
    else if(navigator.userAgent.indexOf("Chrome") != -1){
        name = "Chrome";
    }
    else if(navigator.userAgent.indexOf("Safari")!=-1){
        name = "Safari";
    }
    return name;
}

if( getBrowserName() == "Safari" ){
    alert("You are using Safari");
}else{
    alert("You are surfing on " + getBrowserName(name));
}

Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor')

var isSafari = /^((?!chrome|android|crios|fxios).)*safari/i.test(navigator.userAgent);