Conversion of utf8 and GBK characters in JS

: This article mainly introduces UTF-8 and GBK character encoding conversion in JS. For more information about PHP tutorials, see. Link: http://igogogo9.iteye.com/blog/105669

1. the json_encode function in PHP can only encode the data of the UTF-8. when converting the data of GBK or GB2312 encoding, it will convert the Chinese character to NULL.

2. use of json in JavaScript:

① Convert the object into a json string:

JSON. stringify (obj)

② Convert json into an object:

DataObj = eval ('{"name": "Jack "}');

③ Convert json generated by PHP into an object:

DataObj = eval ('( 'Jack')?>) ');

3. conversion of GBK and UTF-8 in JavaScript:

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[0] != ""){      retV = sa[0];    }    for(var i = 1; i < sa.length; 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<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 byteb = 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;}}

The above introduces the UTF-8 and GBK character encoding conversion in JS, including some content, and hope to be helpful to friends who are interested in PHP tutorials.