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???? AJAX传递中文字符串时必须把中文字符串编码成unicode,一般会用到JS的自带函数escape().不过找到了更好的函数来确决中文字符转换成unicode编码的函数

function uniencode(text){
  text = escape(text.toString()).replace(/\+/g, "%2B");
  var matches = text.match(/(%([0-9A-F]{2}))/gi);
  if (matches){
    for (var matchid = 0; matchid < matches.length; matchid++){
      var code = matches[matchid].substring(1,3);
      if (parseInt(code, 16) >= 128){
        text = text.replace(matches[matchid], '%u00' + code);
      }
    }
  }
  text = text.replace('%25', '%u0025');
  return text;
}

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??? 当然服务器端要对编码过的字符串进行第二次转码.把字符串转换成UTF-8编码.

function convert_int_to_utf8($intval){
  $intvalintval = intval($intval);
  switch ($intval){
    // 1 byte, 7 bits
    case 0:
      return chr(0);
    case ($intval & 0x7F):
      return chr($intval);
    // 2 bytes, 11 bits
    case ($intval & 0x7FF):
      return chr(0xC0 | (($intval >> 6) & 0x1F)).chr(0x80 | ($intval & 0x3F));
    // 3 bytes, 16 bits         
    case ($intval & 0xFFFF):
      return chr(0xE0 |(($intval >> 12) & 0x0F)).chr(0x80 | (($intval >> 6) & 0x3F)).chr (0x80 | ($intval & 0x3F));
    // 4 bytes, 21 bits
    case ($intval & 0x1FFFFF):
      return chr(0xF0 | ($intval >> 18)).chr(0x80 | (($intval >> 12) & 0x3F)).chr(0x80 | (($intval >> 6) & 0x3F)).chr(0x80 | ($intval & 0x3F));
  }
}

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