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1 /* 2 * GB2312转UTF8 3 * 例： 4 * var xx=new GB2312UTF8(); 5 * var Utf8=xx.Gb2312ToUtf8("你aaa好aaaaa"); 6 * var Gb2312=xx.Utf8ToGb2312(Utf8); 7 * alert(Gb2312); 8 */ 9 10 function GB2312UTF8(){ 11 this.Dig2Dec=function(s){ 12 var retV = 0; 13 if(s.length == 4){ 14 for(var i = 0; i < 4; i ++){ 15 retV += eval(s.charAt(i)) * Math.pow(2, 3 - i); 16 } 17 return retV; 18 } 19 return -1; 20 } 21 this.Hex2Utf8=function(s){ 22 var retS = ""; 23 var tempS = ""; 24 var ss = ""; 25 if(s.length == 16){ 26 tempS = "1110" + s.substring(0, 4); 27 tempS += "10" + s.substring(4, 10); 28 tempS += "10" + s.substring(10,16); 29 var sss = "0123456789ABCDEF"; 30 for(var i = 0; i < 3; i ++){ 31 retS += "%"; 32 ss = tempS.substring(i * 8, (eval(i)+1)*8); 33 retS += sss.charAt(this.Dig2Dec(ss.substring(0,4))); 34 retS += sss.charAt(this.Dig2Dec(ss.substring(4,8))); 35 } 36 return retS; 37 } 38 return ""; 39 } 40 this.Dec2Dig=function(n1){ 41 var s = ""; 42 var n2 = 0; 43 for(var i = 0; i < 4; i++){ 44 n2 = Math.pow(2,3 - i); 45 if(n1 >= n2){ 46 s += '1'; 47 n1 = n1 - n2; 48 } 49 else 50 s += '0'; 51 } 52 return s; 53 } 54 55 this.Str2Hex=function(s){ 56 var c = ""; 57 var n; 58 var ss = "0123456789ABCDEF"; 59 var digS = ""; 60 for(var i = 0; i < s.length; i ++){ 61 c = s.charAt(i); 62 n = ss.indexOf(c); 63 digS += this.Dec2Dig(eval(n)); 64 } 65 return digS; 66 } 67 this.Gb2312ToUtf8=function(s1){ 68 var s = escape(s1); 69 var sa = s.split("%"); 70 var retV =""; 71 if(sa[0] != ""){ 72 retV = sa[0]; 73 } 74 for(var i = 1; i < sa.length; i ++){ 75 if(sa[i].substring(0,1) == "u"){ 76 retV += this.Hex2Utf8(this.Str2Hex(sa[i].substring(1,5))); 77 if(sa[i].length){ 78 retV += sa[i].substring(5); 79 } 80 } 81 else{ 82 retV += unescape("%" + sa[i]); 83 if(sa[i].length){ 84 retV += sa[i].substring(5); 85 } 86 } 87 } 88 return retV; 89 } 90 this.Utf8ToGb2312=function(str1){ 91 var substr = ""; 92 var a = ""; 93 var b = ""; 94 var c = ""; 95 var i = -1; 96 i = str1.indexOf("%"); 97 if(i==-1){ 98 return str1; 99 }100 while(i!= -1){101 if(i<3){102 substr = substr + str1.substr(0,i-1);103 str1 = str1.substr(i+1,str1.length-i);104 a = str1.substr(0,2);105 str1 = str1.substr(2,str1.length - 2);106 if(parseInt("0x" + a) & 0x80 == 0){107 substr = substr + String.fromCharCode(parseInt("0x" + a));108 }109 else if(parseInt("0x" + a) & 0xE0 == 0xC0){ //two byte110 b = str1.substr(1,2);111 str1 = str1.substr(3,str1.length - 3);112 var widechar = (parseInt("0x" + a) & 0x1F) << 6;113 widechar = widechar | (parseInt("0x" + b) & 0x3F);114 substr = substr + String.fromCharCode(widechar);115 }116 else{117 b = str1.substr(1,2);118 str1 = str1.substr(3,str1.length - 3);119 c = str1.substr(1,2);120 str1 = str1.substr(3,str1.length - 3);121 var widechar = (parseInt("0x" + a) & 0x0F) << 12;122 widechar = widechar | ((parseInt("0x" + b) & 0x3F) << 6);123 widechar = widechar | (parseInt("0x" + c) & 0x3F);124 substr = substr + String.fromCharCode(widechar);125 }126 }127 else {128 substr = substr + str1.substring(0,i);129 str1= str1.substring(i);130 }131 i = str1.indexOf("%");132 }133 134 return substr+str1;135 }136 }
转载于:https://www.cnblogs.com/Mygirl/archive/2011/09/15/2177679.html
相关资源：utf8,gb2312批量文件相互转换工具
