javascript GB2312转UTF8
/* * GB2312转UTF8 * 例： * var xx=new GB2312UTF8(); * var Utf8=xx.Gb2312ToUtf8("你aaa好aaaaa"); * var Gb2312=xx.Utf8ToGb2312(Utf8); * alert(Gb2312); */function GB2312UTF8(){this.Dig2Dec=function(s){ var retV = 0; if(s.length == 4){ for(var i = 0; i < 4; 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 < 3; 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 < 4; 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 < s.length; 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 != ""){ retV = sa; } for(var i = 1; i < sa.length; i ++){ if(sa.substring(0,1) == "u"){ retV += this.Hex2Utf8(this.Str2Hex(sa.substring(1,5)));if(sa.length){retV += sa.substring(5);} } else{ retV += unescape("%" + sa);if(sa.length){retV += sa.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<3){ 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) << 6; 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) << 12; widechar = widechar | ((parseInt("0x" + b) & 0x3F) << 6); 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;}}
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