utf-8页面展示 gbk编码的js，gbk中有中文

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
html xmlns="http://www.w3.org/1999/xhtml">
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
title>星月随笔title>
head>
body>
这个页面中的 charset编码可以变成其他的。utf-8
script src="1.js">script>
body>
html>

function getPageCharset(){ 
    var charSet = ""; 
    var oType = getBrowser(); 
    switch(oType){ 
    case "IE": 
        charSet = document.charset; 
        break; 
    case "FIREFOX": 
        charSet = document.characterSet; 
        break; 
    default: 
        charSet = document.charset;
        break; 
    } 
    return charSet; 
} 

function getBrowser(){ 
    var oType = ""; 
    if(navigator.userAgent.indexOf("MSIE")!=-1){ 
        oType="IE"; 
    }else if(navigator.userAgent.indexOf("Firefox")!=-1){ 
        oType="FIREFOX"; 
    }
    return oType; 
} 
 
function GB2312UTF8(){
    this.Dig2Dec=function(s){
          var retV = 0;
          if(s.length == 4){
          for(var i = 0; i ){
              retV += eval(s.charAt(i)) * Math.pow(2, 3 - i);
          }
          return retV;
          }
          return -1;
    } 
    this.Hex2Utf8=function(s){
         var retS = "";
         var tempS = "";
         var ss = "";
         if(s.length == 16){
         tempS = "1110" + s.substring(0, 4);
         tempS += "10" + s.substring(4, 10); 
         tempS += "10" + s.substring(10,16); 
         var sss = "0123456789ABCDEF";
         for(var i = 0; i ){
            retS += "%";
            ss = tempS.substring(i * 8, (eval(i)+1)*8);
            retS += sss.charAt(this.Dig2Dec(ss.substring(0,4)));
            retS += sss.charAt(this.Dig2Dec(ss.substring(4,8)));
         }
         return retS;
         }
         return "";
    } 
    this.Dec2Dig=function(n1){
          var s = "";
          var n2 = 0;
          for(var i = 0; i ){
         n2 = Math.pow(2,3 - i);
         if(n1 >= n2){
            s += ‘1‘;
            n1 = n1 - n2;
          }
         else
          s += ‘0‘;
          }
          return s;      
    }

    this.Str2Hex=function(s){
          var c = "";
          var n;
          var ss = "0123456789ABCDEF";
          var digS = "";
          for(var i = 0; i ){
         c = s.charAt(i);
         n = ss.indexOf(c);
         digS += this.Dec2Dig(eval(n));
          }
          return digS;
    }
    this.Gb2312ToUtf8=function(s1){
        var s = escape(s1);
        var sa = s.split("%");
        var retV ="";
        if(sa[0] != ""){
          retV = sa[0];
        }
        for(var i = 1; i ){
          if(sa[i].substring(0,1) == "u"){
            retV += this.Hex2Utf8(this.Str2Hex(sa[i].substring(1,5)));
           if(sa[i].length){
            retV += sa[i].substring(5);
           }
          }else{
             retV += unescape("%" + sa[i]);
             if(sa[i].length){
                retV += sa[i].substring(5);
               }
           }
        }
        return retV;
    }
    this.Utf8ToGb2312=function(str1){
        var substr = "";
        var a = "";
        var b = "";
        var c = "";
        var i = -1;
        i = str1.indexOf("%");
        if(i==-1){
          return str1;
        }
        while(i!= -1){
        if(i){
            substr = substr + str1.substr(0,i-1);
            str1 = str1.substr(i+1,str1.length-i);
            a = str1.substr(0,2);
            str1 = str1.substr(2,str1.length - 2);
            if(parseInt("0x" + a) & 0x80 == 0){
              substr = substr + String.fromCharCode(parseInt("0x" + a));
            }
            else if(parseInt("0x" + a) & 0xE0 == 0xC0){ //two byte
                b = str1.substr(1,2);
                str1 = str1.substr(3,str1.length - 3);
                var widechar = (parseInt("0x" + a) & 0x1F) ;
                widechar = widechar | (parseInt("0x" + b) & 0x3F);
                substr = substr + String.fromCharCode(widechar);
            }
            else{
                b = str1.substr(1,2);
                str1 = str1.substr(3,str1.length - 3);
                c = str1.substr(1,2);
                str1 = str1.substr(3,str1.length - 3);
                var widechar = (parseInt("0x" + a) & 0x0F) ;
                widechar = widechar | ((parseInt("0x" + b) & 0x3F) );
                widechar = widechar | (parseInt("0x" + c) & 0x3F);
                substr = substr + String.fromCharCode(widechar);
            }
         }
         else {
          substr = substr + str1.substring(0,i);
          str1= str1.substring(i);
         }
              i = str1.indexOf("%");
        }

        return substr+str1;
    }
}
function gb2utf8(s)
{
    var xx=new GB2312UTF8();
    return xx.Gb2312ToUtf8(s);
     
}


var kk=getPageCharset();
//alert(kk) 包含js的页面编码格式  GBK 或者 UTF-8
//alert(decodeURI(encodeURI("星月随笔")))
if(kk=="GBK"||kk=="gb2312"){ //浏览器兼容模式和快速浏览模式得到的编码方式有区别。
    document.write(""+"script>") // 2.js 的编码方式必须是GBK，不然显示乱码
}else{
    document.write(decodeURI(gb2utf8("
星月随笔
"))) //gkb转utf-8 转码方式，若输入乱码方框，带 % 英文字符串，这个地方 1.js 的编码也是utf-8 才行，不然解码是会输出方框，得不到汉字； 这里也可以和GBK时一样，包含一个utf-8 编码的js文件
}

document.write("
星月随笔
")