browser-info.js

原名JSPackager

var notChecker = function(minVersion,maxVersion){return false};
var BrowserInfo = {
  version :null,
  isIE : notChecker,
  isOpera : notChecker,
  isGecko : notChecker,
  isNetscape : notChecker,
  isMozilla : notChecker,
  isFirefox : notChecker,
  isKHTML : notChecker,
  isSafari : notChecker,
  isKonqueror : notChecker,
  isQuirks : function(){
    return document["compatMode"] == "BackCompat" || document["compatMode"] == "QuirksMode";
  }
};
function Version(version){
  var vs = version.match(/([\d\.]*)(.*)?/);
  this.flag = vs[2]?vs[2].replace(/^\s+(.*[^\s])\s+$/,'$1')||'':'';
  vs = vs[1].match(/(\d+(\.\d+)?)/g); 
  for(var i = vs.length-1;i>=0;i--){
    vs[i] = parseFloat(vs[i]);
  }
  this.version = version;
  this.value = vs[0];
  this.values = vs;
}
Version.prototype.compare = function(v){

  if(typeof v == 'number'){
    if(v == this.value){
      for(var i = 1;i<this.values.length;i++){
        if(this.values[i])return 1;
      }
      return 0;
    }else{
      //alert(v-this.value)
      return v-this.value;
    }
  }else{
    if(typeof v == 'string'){
      if(v == this.version){
        return 0;
      }
      v = new Version(v);
    }
    if(v.value == this.value){
      var l = Math.min(this.values.length,v.values.length);
      for(var i = 1;i<l;i++){
        if(this.values[i])return 1;
      }
      l = v.values.length - this.value.length;
      if(l>0){
        return 1;
      }else if(l<0){
        return -1;
      }
      if(v.flag == this.flag){
        return 0;
      }else if(!v.flag ){
        return 1;
      }else if(!this.flag ){
        return -1;
      }else{
        return v.flag>this.flag?1:-1;
      }
    }else{
      return v.value - this.value
    }
  }
  
}
Version.prototype.before = function(v){
  return this.compare(v)>=0;
}
Version.prototype.after = function(v){
  return this.compare(v)<=0;
}

function buildBrowserChecker(version){
  var v = new Version(version);
  //function check(min,max){
  return function(min,max){
    if(min == null){
      if(max == null){
        return version;
      }else{
        return v.before(max)? version:false;
      }
    }else if(max == null){
      return v.after(min)? version:false;
    }else{
      return v.after(min) && v.before(max)? version:false;
    }
  }
  //return function(min,max){
  //  //alert(min+"-"+max+":"+check(min,max));
  //  return check(min,max);
  //}
}
var ua = window.navigator.userAgent;
if(ua.indexOf("Opera") > 0){//Opera
  var version = ua.replace(/.*Opera\s+([^; ]+).*/,'$1');
  BrowserInfo.isOpera = buildBrowserChecker(version);
}else if(ua.indexOf(" MSIE ") > 0){//MSIE
  var version = ua.replace(/.*MSIE\s+([^; ]+).*/,'$1');
  BrowserInfo.isIE = buildBrowserChecker(version);
  if(BrowserInfo.isIE(null,5.9)){
    BrowserInfo.isQuirks = function(){return true;};
  }
}else if(ua.indexOf("Gecko/") > 0){//mozilla netscape firefox ...
  var version = ua.replace(/.*Gecko[\s\/]*([^;\/\) ]+).*/,'$1');
  BrowserInfo.isGecko = buildBrowserChecker(version);
  if(ua.indexOf("Firefox") > 0){
    var version = ua.replace(/.*Firefox[\s\/]*([^;\/\) ]+).*/,'$1');
    BrowserInfo.isFirefox = buildBrowserChecker(version);
  }else if(ua.indexOf("Netscape") > 0){
    var version = ua.replace(/.*Netscape[\s\/]*([^;\/\) ]+).*/,'$1');
    BrowserInfo.isNetscape = buildBrowserChecker(version);
  }else if(ua.indexOf("Mozilla") > 0){
    var version = ua.replace(/.*rv:([^;\/\) ]+).*/,'$1');
    BrowserInfo.isMozilla = buildBrowserChecker(version);
  }
}else if(ua.indexOf("KHTML") > 0){//khtml 
  if(ua.indexOf("Konqueror") > 0){//Konqueror 糟糕的浏览器
    //var version = ua.replace(/.*AppleWebKit\/([^;\/ ]+).*/,'$1');
    //BrowserInfo.isKHTML = buildBrowserChecker(version);
    BrowserInfo.isKHTML = function(){return true;};
    version = ua.replace(/.*Konqueror\/([^;\/ ]+).*/,'$1');
    BrowserInfo.isKonqueror = buildBrowserChecker(version);
  }
}else if(ua.indexOf("Safari") > 0){//Safari khtml 
  //var version = ua.replace(/.*AppleWebKit\/([^;\/ ]+).*/,'$1');
  //BrowserInfo.isKHTML = buildBrowserChecker(version);
  BrowserInfo.isKHTML = function(){return true;};
  version = ua.replace(/.*Safari\/([^;\/ ]+).*/,'$1');
  BrowserInfo.isSafari = buildBrowserChecker(version);
}else{
  //UNKNOW 
}
//$JSI.navigator = BrowserInfo;
for(var n in BrowserInfo){
  window.navigator[n] = BrowserInfo[n];
}